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Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 31, 2020	Apr. 16, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	001-33245
Entity Registrant Name	EMPLOYERS HOLDINGS, INC.
Entity Incorporation, State or Country Code	NV
Entity Tax Identification Number	04-3850065
Entity Address, Address Line One	10375 Professional Circle
Entity Address, City or Town	Reno,
Entity Address, State or Province	NV
Entity Address, Postal Zip Code	89521
City Area Code	888
Local Phone Number	682-6671
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	EIG
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		30,373,572
Entity Central Index Key	0001379041
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Investments:
Fixed maturity securities at fair value (amortized cost $2,314.7 at March 31, 2020 and $2,403.3 at December 31, 2019, net of CECL allowance of $10.7 million at March 31, 2020)	$ 2,367,400	$ 2,485,900
Equity securities at fair value (cost $173.8 at March 31, 2020 and $155.6 at December 31, 2019)	205,700	256,700
Equity securities at cost	6,700	6,700
Other invested assets (cost $31.1 at March 31, 2020 and $28.4 at December 31, 2019)	31,400	29,100
Short-term investments at fair value (amortized cost $9.3 at March 31, 2020)	9,300	0
Total investments	2,620,500	2,778,400
Cash and cash equivalents	174,100	154,900
Restricted cash and cash equivalents	300	300
Accrued investment income	16,800	16,400
Premiums receivable (less CECL allowance of $3.9 at March 31, 2020 and less bad debt allowance of $4.6 at December 31, 2019)	292,200	285,700
Reinsurance recoverable for:
Paid losses	7,500	7,200
Unpaid losses (less CECL allowance of $0.4 at March 31, 2020)	526,600	532,500
Deferred policy acquisition costs	51,600	47,900
Deferred income taxes, net	19,800	0
Property and equipment, net	21,600	21,900
Operating lease right-of-use assets	14,900	15,900
Intangible assets, net	13,600	13,600
Goodwill	36,200	36,200
Contingent commission receivable—LPT Agreement	13,200	13,200
Cloud computing arrangements	36,500	33,600
Other assets	66,800	46,400
Total assets	3,912,200	4,004,100
Liabilities and stockholders’ equity
Unpaid losses and loss adjustment expenses	2,191,700	2,192,800
Unearned premiums	353,800	337,100
Commissions and premium taxes payable	47,600	48,600
Accounts payable and accrued expenses	27,100	29,800
Deferred reinsurance gain—LPT Agreement	134,700	137,100
Operating lease liability	16,800	17,800
Non-cancellable obligations	21,300	23,000
Other liabilities	61,900	52,100
Total liabilities	2,854,900	2,838,300
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value; 150,000,000 shares authorized; 57,375,585 and 57,184,370 shares issued and 30,403,012 and 31,355,378 shares outstanding at March 31, 2020 and December 31, 2019, respectively	600	600
Preferred stock, $0.01 par value; 25,000,000 shares authorized; none issued	0	0
Additional paid-in capital	397,000	396,400
Retained earnings	1,115,900	1,158,800
Accumulated other comprehensive income, net of tax	41,600	65,300
Treasury stock, at cost (26,972,573 shares at March 31, 2020 and 25,828,992 shares at December 31, 2019)	(497,800)	(455,300)
Total stockholders’ equity	1,057,300	1,165,800
Total liabilities and stockholders’ equity	$ 3,912,200	$ 4,004,100

Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
Consolidated Statements of Income - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019
Revenues
Net premiums earned	$ 167.9	$ 174.8
Net investment income	19.9	21.8
Net realized and unrealized (losses) gains on investments	(61.1)	23.3
Other income	0.3	0.4
Total revenues	127.0	220.3
Expenses
Losses and loss adjustment expenses	104.3	88.6
Commission expense	21.3	22.0
Underwriting and general and administrative expenses	46.7	47.5
Interest and financing expenses	0.0	0.4
Total expenses	172.3	158.5
Net (loss) income before income taxes	(45.3)	61.8
Income tax (benefit) expense	(10.4)	10.0
Net (loss) income	(34.9)	51.8
Comprehensive (loss) income
Unrealized AFS investment (losses) gains arising during the period (net of tax benefit (expense) of $7.6 and $(10.0) for the three months ended March 31, 2020 and 2019, respectively)	(29.2)	37.8
Reclassification adjustment for realized AFS investment losses (gains) in net income (net of tax benefit (expense) of $1.4 and $(0.1) for the three months ended March 31, 2020 and 2019, respectively)	5.5	(0.5)
Other comprehensive (loss) income, net of tax	(23.7)	37.3
Total comprehensive (loss) income	(58.6)	89.1
Net realized and unrealized (losses) gains on investments
Net realized and unrealized (losses) gains on investments before impairments	(61.1)	23.3
Other than temporary impairment recognized in earnings	0.0	0.0
Net realized and unrealized (losses) gains on investments	$ (61.1)	$ 23.3
Earnings (loss) per common share (Note 13):
Basic	$ (1.14)	$ 1.60
Diluted	(1.14)	1.57
Cash dividends declared per common share and eligible RSUs and PSUs	$ 0.25	$ 0.22

Consolidated Balance Sheets Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Available for sale:
Debt securities, available-for-sale, amortized cost	$ 2,314,700	$ 2,403,300
Equity Securities, FV-NI, Cost	173,800	155,600
Other Investments and Securities, at Cost	31,100	28,400
Available for sale, short-term investments, at amortized cost	9,300	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	10,700	0
Accounts Receivable, Allowance for Credit Loss, Current	3,900	4,600
Reinsurance recoverables on unpaid losses, allowance	$ 400	$ 0
Stockholders' equity
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	57,375,585	57,184,370
Common stock, shares outstanding (in shares)	30,403,012	31,355,378
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	25,000,000	25,000,000
Preferred stock, shares issued (in shares)	0	0
Treasury stock, at cost (in shares)	26,972,573	25,828,992

Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement Parenthetical [Abstract]
Other comprehensive income (loss), unrealized holding gain (loss) on securities arising during period, tax	$ 7.6	$ (10.0)
Other comprehensive income (loss), reclassification adjustment for sale of securities included in net income, tax	$ (1.4)	$ 0.1

Consolidated Statements of Stockholders Equity Statement - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income, Net	Treasury Stock [Member]
Stockholders' equity, shares at Dec. 31, 2018		56,975,675
Stockholders' equity, value at Dec. 31, 2018	$ 1,018.2	$ 0.6	$ 388.8	$ 1,030.7	$ (13.7)	$ (388.2)
Stock-based obligations, shares		0
Stock-based obligations, value	$ 2.4	$ 0.0	2.4	0.0	0.0	0.0
Stock-options exercised, shares	1,300	1,300
Stock-options exercised, value	$ 0.1	$ 0.0	0.1	0.0	0.0	0.0
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, shares		167,555
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, value	(3.2)	$ 0.0	(3.2)	0.0	0.0	0.0
Acquisition of common stock, shares		0
Acquisition of common stock, value	(27.5)	$ 0.0	0.0	0.0	0.0	(27.5)
Dividends declared, shares		0
Dividends declared, value	(7.4)	$ 0.0	0.0	(7.4)	0.0	0.0
Net income	51.8	0.0	0.0	51.8	0.0	0.0
Change in net unrealized gains in investments, net of tax	37.3	$ 0.0	0.0	0.0	37.3	0.0
Stockholders' equity, shares at Mar. 31, 2019		57,144,530
Stockholders' equity, value at Mar. 31, 2019	1,071.7	$ 0.6	388.1	1,075.1	23.6	(415.7)
Stockholders' equity, shares at Dec. 31, 2018		56,975,675
Stockholders' equity, value at Dec. 31, 2018	$ 1,018.2	$ 0.6	388.8	1,030.7	(13.7)	(388.2)
Stock-options exercised, shares	31,630
Stockholders' equity, shares at Dec. 31, 2019	57,184,370	57,184,370
Stockholders' equity, value at Dec. 31, 2019	$ 1,165.8	$ 0.6	396.4	1,158.8	65.3	(455.3)
Stock-based obligations, shares		0
Stock-based obligations, value	$ 2.5	$ 0.0	2.5	0.0	0.0	0.0
Stock-options exercised, shares	36,500	36,500
Stock-options exercised, value	$ 0.8	$ 0.0	0.8	0.0	0.0	0.0
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, shares		154,715
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, value	(2.7)	$ 0.0	(2.7)	0.0	0.0	0.0
Acquisition of common stock, shares		0
Acquisition of common stock, value	(42.5)	$ 0.0	0.0	0.0	0.0	(42.5)
Dividends declared, shares		0
Dividends declared, value	(8.0)	$ 0.0	0.0	(8.0)	0.0	0.0
Net income	(34.9)	0.0	0.0	(34.9)	0.0	0.0
Change in net unrealized gains in investments, net of tax	$ (23.7)	$ 0.0	0.0	0.0	(23.7)	0.0
Stockholders' equity, shares at Mar. 31, 2020	57,375,585	57,375,585
Stockholders' equity, value at Mar. 31, 2020	$ 1,057.3	$ 0.6	$ 397.0	$ 1,115.9	$ 41.6	$ (497.8)

Consolidated Statements of Stockholders Equity (Parentheticals) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Change in net unrealized (losses) gains on investments, net of tax	$ 6.2	$ (9.9)

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Mar. 31, 2020	Dec. 31, 2019
Operating activities
Net income	$ (34,900)	$ 51,800
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	2,100	1,200
Stock-based compensation	2,400	2,400
Amortization of cloud computing arrangements	1,600	1,000	$ 5,300
Amortization of premium on investments, net	3,200	1,900
Allowance for expected credit losses	(300)	(1,000)
Deferred income tax expense	(13,600)	4,000
Net realized and unrealized losses (gains) on investments	61,100	(23,300)
Change in operating assets and liabilities:
Premiums receivable	(5,800)	(18,600)
Reinsurance recoverable on paid and unpaid losses	5,200	5,700
Cloud computing arrangements	(4,500)	(100)
Operating lease right-of-use-assets	1,000	(16,800)
Current federal income taxes	3,000	6,400
Unpaid losses and loss adjustment expenses	1,100	18,600
Unearned premiums	16,700	32,600
Accounts payable, accrued expenses and other liabilities	(1,900)	(10,700)
Deferred reinsurance gain—LPT Agreement	(2,400)	(2,500)
Operating lease liabilities	(1,000)	19,000
Non-cancellable obligations	(1,700)	(1,400)
Other	(13,600)	(12,900)
Net cash provided by operating activities	15,500	20,100
Investing activities
Purchases of fixed maturity securities	(228,300)	(95,400)
Purchases of equity securities	(89,300)	(16,100)
Purchases of short-term investments	(76,200)	(100)
Purchases of other invested assets	(2,700)	0
Proceeds from sale of fixed maturity securities	220,200	51,200
Proceeds from sale of equity securities	86,500	8,700
Proceeds from maturities and redemptions of fixed maturity securities	86,600	65,600
Proceeds from maturities of short-term investments	66,900	25,000
Net change in unsettled investment purchases and sales	(5,600)	(24,200)
Capital expenditures and other	(1,900)	(4,800)
Net cash provided by investing activities	56,200	9,900
Financing activities
Acquisition of common stock	(42,500)	(26,600)
Cash transactions related to stock-based compensation	(1,900)	(3,200)
Dividends paid to stockholders	(8,000)	(7,300)
Payments on capital leases	100	100
Net cash used in financing activities	(52,500)	(37,200)
Net increase in cash, cash equivalents and restricted cash	19,200	(7,200)
Cash, cash equivalents, restricted cash and restricted cash equivalents at the beginning of the period	155,200	102,000	102,000
Cash, cash equivalents, restricted cash and restricted cash equivalents at the end of the period	174,400	94,800	155,200
Cash and cash equivalents				$ 174,100	$ 154,900
Restricted cash and cash equivalents				300	300
Total cash, cash equivalents, restricted cash	$ 155,200	$ 102,000	$ 155,200	$ 174,400	$ 155,200

Basis of Presentation	3 Months Ended
Basis of Presentation	Mar. 31, 2020
Basis of Presentation [Abstract]
Basis of Presentation	Basis of Presentation and Summary of Operations Employers Holdings, Inc. (EHI) is a Nevada holding company. Through its wholly owned insurance subsidiaries, Employers Insurance Company of Nevada (EICN), Employers Compensation Insurance Company (ECIC), Employers Preferred Insurance Company (EPIC), Employers Assurance Company (EAC), and Cerity Insurance Company (CIC), EHI is engaged in the commercial property and casualty insurance industry, specializing in workers’ compensation products and services. Unless otherwise indicated, all references to the “Company” refer to EHI, together with its subsidiaries. In 1999, the Nevada State Industrial Insurance System (the Fund) entered into a retroactive 100% quota share reinsurance agreement (the LPT Agreement) through a loss portfolio transfer transaction with third party reinsurers. The LPT Agreement commenced on June 30, 1999 and will remain in effect until all claims under the covered policies have closed, the LPT Agreement is commuted or terminated, upon the mutual agreement of the parties, or the reinsurers’ aggregate maximum limit of liability is exhausted, whichever occurs first. The LPT Agreement does not provide for any additional termination terms. On January 1, 2000, EICN assumed all of the assets, liabilities and operations of the Fund, including the Fund’s rights and obligations associated with the LPT Agreement (See Note 9). The Company accounts for the LPT Agreement as retroactive reinsurance. Upon entry into the LPT Agreement, an initial deferred reinsurance gain (the Deferred Gain) was recorded as a liability on the Company’s Consolidated Balance Sheets. The Company is entitled to receive a contingent profit commission under the LPT Agreement. The contingent profit commission is estimated based on both actual paid results to date and projections of expected paid losses under the LPT Agreement and is recorded as an asset on the Company’s Consolidated Balance Sheets. The accompanying consolidated financial statements have been prepared in accordance with United States (U.S.) generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X of the Securities Exchange Act of 1934, as amended. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal, recurring adjustments) necessary for a fair presentation of the Company’s consolidated financial position and results of operations for the periods presented have been included. The results of operations for an interim period are not necessarily indicative of the results for an entire year. These financial statements have been prepared consistent with the accounting policies described in the Company’s Form 10-K for the year ended December 31, 2019 (Annual Report). The Company operates through two reportable segments: Employers and Cerity. Each of the segments represents a separate and distinct underwriting platform through which the Company conducts insurance business. This presentation allows the reader, as well as the Company's chief operating decision makers, to objectively analyze the business originated through each of the Company's underwriting platforms. Prior to December 31, 2019, the Company operated under a single reportable segment. All periods prior to December 31, 2019 have been conformed to the current presentation. Detailed financial information about the Company's operating segments is presented in Note 14. Use of Estimates The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. As a result, actual results could differ from these estimates. The most significant areas that require management judgment are the estimate of unpaid losses and loss adjustment expenses (LAE), evaluation of reinsurance recoverables, recognition of premium revenue, recoverability of deferred income taxes, and valuation of investments. Reclassifications Certain prior period information has been reclassified to conform to the current period presentation.

New Accounting Standards Level 1 (Notes)	3 Months Ended
New Accounting Standards Level 1 (Notes)	Mar. 31, 2020
New Accounting Standards [Abstract]
New Accounting Standards	New Accounting Standards Recently Issued Accounting Standards In March 2020, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2020-04, Reference Rate Reform (Topic 848). This update provides optional transition guidance to ease the potential accounting burden associated with transitioning away from the London Interbank Offered Rate (LIBOR), with optional expedients and exceptions related to the application of US GAAP to contracts, hedging relationships and other transactions affected by reference rate reform. Companies can apply this ASU immediately, but early adoption is only available through December 31, 2022. The Company is evaluating the impact of LIBOR on its existing contracts and investments, but does not expect that this update will have a material impact on its consolidated financial condition or results of operations. In December 2019, FASB issued ASU 2019-12, Income Taxes (Topic 740). This update simplifies the accounting for income taxes within Accounting Standards Codification (ASC) topic 740 by removing certain exceptions and clarifying existing guidance. This update becomes effective for fiscal years, and interim periods within those fiscal years beginning after December 15, 2020. The Company has determined that the impact of this new standard will not be material to its consolidated financial condition and results of operations. Recently Adopted Accounting Standards In April 2019, FASB issued ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments. The amendments in this update represent changes to clarify, correct errors in, or improve the codification within various ASC topics. The Company adopted the updates related to Topic 815 when it adopted ASU 2016-13. The Company determined that the impact of these improvements was not material to its consolidated financial condition and results of operations. In August 2018, FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. This update removes the disclosure requirements for the amounts of and the reasons for transfers between Level 1 and Level 2 and disclosure of the policy for timing of transfers between levels. This update also removes disclosure requirements for the valuation processes for Level 3 fair value measurements. Additionally, this update adds disclosure requirements for the changes in unrealized gains and losses for recurring Level 3 fair value measurements and quantitative information for certain unobservable inputs in Level 3 fair value measurements. Additionally, in March 2020, FASB issued ASU 2020-03, Codification Improvements to Financial Instruments. This update provided clarification and eliminated inconsistencies on a variety of topics within the codification. The Company adopted applicable standards and there was no impact on its consolidated financial condition and results of operations. In January 2017, FASB issued ASU 2017-04, Intangibles-Goodwill and Other (Topic 350). This update simplifies the measurement of goodwill by eliminating the performance of Step 2 in the goodwill impairment testing. This update allows the testing to be performed by comparing the fair value of a reporting unit with its carrying amount and recognizing an impairment charge when the carrying amount exceeds fair value. Additionally, this update eliminates the requirements of any reporting unit with a zero or negative carrying value to perform Step 2, but requires disclosure of the amount of goodwill allocated to a reporting unit with zero or negative carrying amount of net assets. The Company adopted this standard and there was no impact on its consolidated financial condition and results of operations. In June 2016, FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326). This update replaces the incurred loss impairment methodology for recognizing credit losses on financial instruments with a methodology that reflects an entity's current estimate of all expected credit losses. This update requires financial assets (including receivables and reinsurance recoverables) measured at amortized cost to be presented net of an allowance for credit losses. Additionally, this update requires credit losses on available-for-sale fixed maturity securities to be presented as an allowance rather than as a write-down, allowing an entity to also record reversals of credit losses in current period net income. This update is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Additionally, in December 2018, FASB issued ASU 2018-19, Codification Improvements to Topic 326, Financial Instruments - Credit Losses. This update provides clarification on the effective and transition dates and the exclusion of operating lease receivables from Topic 326. In May 2019, FASB issued ASU 2019-05, Financial Instruments - Credit Losses (Topic 326): Targeted Transition Relief. This update adds optional transition relief for entities to elect the fair value option for certain financial assets previously measured at amortized cost basis to increase comparability of similar financial assets. In December 2019, FASB issued ASU 2019-11, Codification Improvements to Topic 326, Financial Instruments - Credit Losses which provides clarification on certain aspects of the guidance in ASC 326 including purchased credit-deteriorated financial assets, transition relief for troubled debt restructurings, disclosure relief for accrued interest receivables and allows a practical expedient for financial assets secured by collateral maintenance provisions. The Company adopted these standards on January 1, 2020 and did not make any opening balance sheet adjustments due to the immaterial amounts. See Note 5 regarding the impact of this adoption on the Company's consolidated financial condition and results of operations.

Valuation of Financial Instruments

3 Months Ended

Mar. 31, 2020

Fair Value of Financial Instruments [Abstract]

Fair Value of Financial Instruments

Valuation of Financial Instruments

Financial Instruments Carried at Fair Value

The carrying value and the estimated fair value of the Company’s financial instruments at fair value were as follows:



	March 31, 2020				December 31, 2019
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
	(in millions)
Financial assets
Total investments at fair value	$	2,582.4	$	2,582.4	$	2,742.6	$	2,742.6
Cash and cash equivalents	174.1		174.1		154.9		154.9
Restricted cash and cash equivalents	0.3		0.3		0.3		0.3

Assets and liabilities recorded at fair value on the Company’s Consolidated Balance Sheets are categorized based upon the levels of judgment associated with the inputs used to measure their fair value. Level inputs are defined as follows:


•	Level 1 - Inputs are unadjusted quoted market prices for identical assets or liabilities in active markets at the measurement date.


•	Level 2 - Inputs other than Level 1 prices that are observable for similar assets or liabilities through corroboration with market data at the measurement date.


•	Level 3 - Inputs that are unobservable that reflect management’s best estimate of what willing market participants would use in pricing the assets or liabilities at the measurement date.

The Company uses third party pricing services to assist it with its investment accounting function. The ultimate pricing source varies depending on the investment security and pricing service used, but investment securities valued on the basis of observable inputs (Levels 1 and 2) are generally assigned values on the basis of actual transactions. Securities valued on the basis of pricing models with significant unobservable inputs or non-binding broker quotes are classified as Level 3. The Company performs quarterly analyses on the prices it receives from third parties to determine whether the prices are reasonable estimates of fair value, including confirming the fair values of these securities through observable market prices using an alternative pricing source, as it is ultimately management’s responsibility to ensure that the fair values reflected in the Company’s consolidated financial statements are appropriate. If differences are noted in these analyses, the Company may obtain additional information from other pricing services to validate the quoted price.

The Company bases all of its estimates of fair value for assets on the bid prices, when available, as they represent what a third-party market participant would be willing to pay in an arm’s length transaction.

For securities not actively traded, third party pricing services may use quoted market prices of similar instruments or discounted cash flow analyses, incorporating inputs that are currently observable in the markets for similar securities. Inputs that are often used in the valuation methodologies include, but are not limited to, broker quotes, benchmark yields, credit spreads, default rates, and prepayment speed assumptions. There were no material adjustments made to the prices obtained from third party pricing services as of March 31, 2020 and December 31, 2019.

These methods of valuation only produce an estimate of fair value if there is objectively verifiable information to produce a valuation. When objectively verifiable information is not available, the Company produces an estimate of fair value using some of the same methodologies, making assumptions for market-based inputs that are unavailable.

The following table presents the Company’s investments at fair value and the corresponding fair value measurements.



	March 31, 2020						December 31, 2019
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
	(in millions)
Fixed maturity securities:
U.S. Treasuries	$	—	$	91.1	$	—	$	—	$	85.6	$	—
U.S. Agencies	—		3.1		—		—		2.9		—
States and municipalities	—		422.4		—		—		484.5		—
Corporate securities	—		971.9		—		—		1,079.0		—
Residential mortgage-backed securities	—		497.6		—		—		480.4		—
Commercial mortgage-backed securities	—		105.0		—		—		110.6		—
Asset-backed securities	—		49.9		—		—		61.2		—
Collateralized loan obligations	—		74.3		—		—		—		—
Other securities	—		152.1		—		—		181.7		—
Total fixed maturity securities	$	—	$	2,367.4	$	—	$	—	$	2,485.9	$	—
Equity securities at fair value:
Industrial and miscellaneous	$	172.3	$	—	$	—	$	216.4	$	—	$	—
Other	33.4		—		—		40.3		—		—
Total equity securities at fair value	$	205.7	$	—	$	—	$	256.7	$	—	$	—
Short-term investments	$	9.3	$	—	$	—	$	—	$	—	$	—
Total investments at fair value	$	215.0	$	2,367.4	$	—	$	256.7	$	2,485.9	$	—

Financial Instruments Carried at Cost

EICN, ECIC, EPIC, and EAC are members of the Federal Home Loan Bank of San Francisco (FHLB). Members are required to purchase stock in the FHLB in addition to maintaining collateral deposits that back any funds advanced. The Company’s investment in FHLB stock is recorded at cost, which approximates fair value, as purchases and sales of these securities are at par value with the issuer. FHLB stock is considered a restricted security and is periodically evaluated by the Company for impairment based on the ultimate recovery of par value.

The Company also has investments in convertible preferred shares of real estate investment trusts which are carried at cost and approximate fair value.

Financial Instruments Carried at Net Asset Value (NAV)

The Company has investments in private equity limited partnership interests that are included in Other invested assets on the Company’s Consolidated Balance Sheets. These investments do not have readily determinable fair values and are carried at NAV and therefore are excluded from the fair value hierarchy. The Company initially estimates the value of these investments using the transaction price. In subsequent periods, the Company measures these investments using NAV per share provided quarterly by the general partner, based on financial statements that are audited annually. The Company performs certain control procedures to validate the appropriateness of using NAV as a measurement. These investments are generally not redeemable by the investees and cannot be sold without approval of the general partner. These investments have a fund term of 12 years, subject to three one year extensions at the general partner’s discretion. The Company will receive distributions of proceeds from dividends and interest from fund investments, as well as from the disposition of a fund investment, or portion thereof. The Company expects these distributions from time-to-time during the full course of the fund term. As of March 31, 2020, the Company had unfunded commitments to these private equity limited partnerships totaling $38.9 million.

Additionally, certain cash equivalents, principally money market securities, are measured using NAV, which approximates fair value.

The following table presents cash and investments carried at NAV on the Company’s Consolidated Balance Sheets.



	March 31, 2020		December 31, 2019
	(in millions)
Cash equivalents carried at NAV	$	72.5	$	14.4
Other invested assets carried at NAV	11.4		9.1

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Investments

3 Months Ended

Mar. 31, 2020

Investments [Abstract]

Investments

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the Company’s available-for-sale (AFS) investments were as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(in millions)
At March 31, 2020
Fixed maturity securities
U.S. Treasuries	$	86.0	$	5.1	$	—		$	91.1
U.S. Agencies	2.8		0.3		—			3.1
States and municipalities	397.2		25.5		(0.3		)	422.4
Corporate securities	947.4		31.0		(6.5		)	971.9
Residential mortgage-backed securities	476.8		22.0		(1.2		)	497.6
Commercial mortgage-backed securities	104.4		2.9		(2.3		)	105.0
Asset-backed securities	52.0		0.2		(2.3		)	49.9
Collateralized loan obligations	83.0		—		(8.7		)	74.3
Other securities	165.1		0.1		(13.1		)	152.1
Total fixed maturity securities	$	2,314.7	87.1		(34.4		)	$	2,367.4
Short-term investments	9.3		—		—			9.3
Total AFS investments	$	2,324.0	$	87.1	$	(34.4	)	$	2,376.7



At December 31, 2019
Fixed maturity securities
U.S. Treasuries	$	83.7	$	1.9	$	—		$	85.6
U.S. Agencies	2.8		0.1		—			2.9
States and municipalities	458.2		26.3		—			484.5
Corporate securities	1,038.6		40.4		—			1,079.0
Residential mortgage-backed securities	471.7		9.4		(0.7		)	480.4
Commercial mortgage-backed securities	107.4		3.2		—			110.6
Asset-backed securities	60.4		0.9		(0.1		)	61.2
Other securities	180.5		1.6		(0.4		)	181.7
Total AFS investments	$	2,403.3	83.8		(1.2		)	$	2,485.9

The cost and estimated fair value of the Company’s equity securities recorded at fair value at March 31, 2020 and December 31, 2019 were as follows:



	Cost		Estimated Fair Value
	(in millions)
At March 31, 2020
Equity securities at fair value
Industrial and miscellaneous	$	139.1	$	172.3
Other	34.7		33.4
Total equity securities at fair value	$	173.8	$	205.7



At December 31, 2019
Equity securities at fair value
Industrial and miscellaneous	$	129.1	$	216.4
Other	26.5		40.3
Total equity securities at fair value	$	155.6	$	256.7

The Company had Other invested assets totaling $31.4 million and $29.1 million at March 31, 2020 and December 31, 2019, respectively. These investments consisted of: (i) private equity limited partnerships that totaled $11.4 million and $9.1 million (initial cost of $11.1 million and $8.4 million) at March 31, 2020 and December 31, 2019, respectively, which are carried at NAV based on information provided by the general partner; and (ii) convertible preferred shares of real estate investment trusts that totaled $20.0 million at each of March 31, 2020 and December 31, 2019, which are carried at cost and approximate fair value. These investments are non-redeemable until conversion and are periodically evaluated by the Company for impairment based on the ultimate recovery of the investment. Changes in the value of these investments are recorded through net realized and unrealized gains and losses on the Company’s Consolidated Statements of Comprehensive Income.

The amortized cost and estimated fair value of the Company’s fixed maturity securities at March 31, 2020, by contractual maturity, are shown below. Expected maturities differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.



	Amortized Cost		Estimated Fair Value
	(in millions)
Due in one year or less	$	88.5	$	88.1
Due after one year through five years	655.8		668.8
Due after five years through ten years	786.8		813.1
Due after ten years	67.4		70.6
Mortgage and asset-backed securities	716.2		726.8
Total	$	2,314.7	$	2,367.4

The following is a summary of AFS investments that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 months or greater as of March 31, 2020 and December 31, 2019.



	March 31, 2020						December 31, 2019
	Estimated Fair Value		Gross Unrealized Losses			Number of Issues	Estimated Fair Value		Gross Unrealized Losses			Number of Issues
	(in millions, except number of issues data)
Less than 12 months:
Fixed maturity securities
States and municipalities	$	17.5	$	(0.3	)	4	$	—	$	—		—
Corporate securities	166.2		(6.5		)	67	—		—			—
Residential mortgage-backed securities	15.2		(1.2		)	6	56.9		(0.2		)	29
Commercial mortgage-backed securities	25.6		(2.3		)	19	—		—			—
Asset-backed securities	39.2		(2.3		)	31	10.1		(0.1		)	6
Collateralized loan obligations	71.8		(8.7		)	19	—		—			—
Other securities	144.1		(12.9		)	297	15.2		(0.3		)	64
Total less than 12 months	$	479.6	$	(34.2	)	443	$	82.2	$	(0.6	)	99

12 months or greater:
Fixed maturity securities
Residential mortgage-backed securities	$	—	$	—		—	$	40.0	$	(0.5	)	19
Other securities	2.4		(0.2		)	13	5.9		(0.1		)	19
Total 12 months or greater	$	2.4	$	(0.2	)	13	$	45.9	$	(0.6	)	38

The Company recorded $10.7 million of allowance for expected credit losses on available-for-sale debt securities during the three months ended March 31, 2020. See Note 5. There were no other-than-temporary impairments on fixed maturity securities recognized during the three months ended March 31, 2019. Those fixed maturity securities whose total fair value was less than amortized cost at March 31, 2020, were those in which the Company had no intent, need or requirement to sell at an amount less than their amortized cost.

Realized gains and losses on investments include the gain or loss on a security at the time of sale compared to its original or adjusted cost (equity securities) or amortized cost (fixed maturity securities). Realized losses on fixed maturity securities are also recognized when securities are written down as a result of an other-than-temporary impairment or for changes in the expected credit loss allowance.

Net realized gains (losses) on investments and the change in unrealized gains on the Company’s investments recorded at fair value are determined on a specific-identification basis and were as follows:



	Gross Realized Gains		Gross Realized Losses			Change in Net Unrealized Gains (Losses)			Changes in Fair Value Reflected in Earnings			Changes in Fair Value Reflected in AOCI, before tax
	(in millions)
Three Months Ended March 31, 2020
Fixed maturity securities	$	4.1	$	(11.0	)	$	(29.9	)	$	(6.9	)	$	(29.9	)
Equity securities	22.7		(7.3		)	(69.2		)	(53.8		)	—
Other invested assets	—		—			(0.4		)	(0.4		)	—
Total investments	$	26.8	$	(18.3	)	$	(99.5	)	$	(61.1	)	$	(29.9	)



Three Months Ended March 31, 2019
Fixed maturity securities	$	1.0	$	(0.4	)	$	47.2	$	0.6	$	47.2
Equity securities	1.6		(0.1		)	21.2		22.7		—
Total investments	$	2.6	$	(0.5	)	$	68.4	$	23.3	$	47.2

Proceeds from the sales of fixed maturity securities were $220.2 million for the three months ended March 31, 2020, compared to $51.2 million for the three months ended March 31, 2019.

Net investment income was as follows:



	Three Months Ended
	March 31,
	2020			2019
	(in millions)
Fixed maturity securities	$	19.3		$	20.4
Equity securities	1.3			1.9
Other invested assets	0.6			—
Short term investments	0.1			—
Cash equivalents and restricted cash	0.2			0.5
Gross investment income	21.5			22.8
Investment expenses	(1.6		)	(1.0		)
Net investment income	$	19.9		$	21.8

The Company is required by various state laws and regulations to hold securities or letters of credit in depository accounts with certain states in which it does business. These laws and regulations govern not only the amount but also the types of securities that are eligible for deposit. As of March 31, 2020 and December 31, 2019, securities having a fair value of $837.2 million and $844.9 million, respectively, were on deposit. Additionally, standby letters of credit from the FHLB were in place in lieu of $295.0 million and $260.0 million of securities on deposit as of March 31, 2020 and December 31, 2019, respectively (See Note 10).

Certain reinsurance contracts require the Company’s funds to be held in trust for the benefit of the ceding reinsurer to secure the outstanding liabilities assumed by the Company. The fair value of fixed maturity securities and restricted cash and cash equivalents held in trust for the benefit of ceding reinsurers at March 31, 2020 and December 31, 2019 was $3.3 million and $2.9 million, respectively.

Current Expected Credit Losses Level 1 (Notes)

3 Months Ended

Mar. 31, 2020

Credit Loss [Abstract]

Credit Losses

Current Expected Credit Losses

The Company adopted ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) in the first quarter of 2020, which replaced the incurred loss methodology with an expected loss methodology known as the current expected loss methodology (CECL). The measurement of CECL is applicable to financial assets measured at amortized cost, which includes held-to-maturity securities, trade receivables, lease receivables, reinsurance recoverables, financial guarantee contracts, loan commitments, and financial assets with evidence of credit deterioration. Additionally, Topic 326 made changes to the accounting for AFS debt securities. This change requires credit losses to be presented as an allowance rather than as a write-down on AFS debt securities that the Company does not intend to sell or believes that it is more likely than not that it will be required to sell.

Premiums Receivable

Premiums receivable balances are all due within one year or less. The Company currently determines the allowance for premiums receivable based on an internal aging schedule using collectability and historical payment patterns, as well as current and expected future market conditions to determine the appropriateness of the allowance. Historical payment patterns provide the basis for the estimation along with similar risk characteristics and the Company's business strategy, which have not changed significantly over time. However, current and future market conditions have deteriorated as compared with the economic conditions included in the historical information. Specifically, unemployment and the temporary closures of small businesses have increased rapidly as of March 31, 2020, and the Company expects this will continue in the near future. Based on our past experience with generally similar conditions, the Company adjusted the historical payment patterns and aging schedule to reflect the differences in our current conditions and future forecasted changes. Changes in the allowance for credit losses are recorded through general and administrative expenses.

The table below shows the changes in the allowance for expected credit losses on premiums receivable.



	Three Months Ended
	March 31,
	2020
	(in millions)
Beginning balance of the allowance for expected credit losses on premiums receivable	$	4.6
Current period provision for expected credit losses	4.1
Write-offs charged against the allowance	(4.8		)
Ending balance of the allowance for expected credit losses on premiums receivable	$	3.9

Reinsurance Recoverable

In assessing an allowance for reinsurance assets, which includes reinsurance recoverables and contingent commission receivables, the Company considers historical information, financial strength of reinsurers, collateralization amounts and ratings to determine the appropriateness of the allowance. Historically, the Company has not experienced a credit loss from reinsurance transactions. In assessing future default, the Company evaluated the CECL allowance under the ratings based method using the A.M. Best Average Cumulative Net Impairment Rates. Reinsurer ratings are also assessed through this process. Changes in the allowance for credit losses are recorded through general and administrative expenses.

The table below shows the changes in the allowance for expected credit losses on reinsurance recoverables.



	Three Months Ended
	March 31,
	2020
	(in millions)
Beginning balance of the allowance for expected credit losses on reinsurance recoverables	$	—
Current period provision for expected credit losses	0.4
Ending balance of the allowance for expected credit losses on reinsurance recoverables	$	0.4

Investments

The Company assesses all AFS debt securities in an unrealized loss position for expected credit losses. The Company first assesses whether it intends to sell, or it is more likely than not that it will be required to sell, the security before recovery of its amortized cost basis. If either of the criteria is met, the security's amortized cost basis is written down to its fair value. For AFS debt securities that do not meet either criteria, the Company evaluates whether the decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. Any impairment that has not been recorded through an allowance for credit losses is recognized in Accumulated other comprehensive income on the Company's Consolidated Balance Sheets. Changes in the allowance for credit losses are recorded through realized capital losses.

As of March 31, 2020, the Company established an aggregate allowance for credit losses in the amount of $10.7 million. For the Company’s investments in fixed-rate debt securities, the allowance for credit losses was determined by: (i) observing the credit characteristics of those debt securities that may have demonstrated a credit loss as of that date and by comparing the present value of cash flows expected to be collected to its amortized cost basis; and (ii) observing the credit characteristics of those debt securities that are expected to demonstrate a credit loss in the future by comparing the expected present value of cash flows expected to be

collected to its amortized cost basis. For the Company’s investments in Bank Loans and Collateralized Loan Obligations, which are not generally subject to interest rate risk, the allowance for credit losses was determined by observing the amount by which the investment’s amortized cost exceeded its fair value and adjusting that amount by the observed impact of the liquidity risk associated with the investment.

As of March 31, 2020, the Company did not intend to sell any of its AFS debt securities in which its amortized cost exceeded its fair value.

Accrued interest receivable on AFS debt securities totaled $16.8 million at March 31, 2020 and is excluded from the estimate of credit losses based on historically timely payments.

The table below shows the changes in the allowance for expected credit losses on available-for-sale securities.



	Three Months Ended
	March 31,
	2020
	(in millions)
Beginning balance of the allowance for expected credit losses on AFS securities	$	—
Current period provision for expected credit losses	10.7
Ending balance of the allowance for expected credit losses on AFS securities	$	10.7

- Definition

The entire disclosure for credit loss on financial instrument measured at amortized cost basis, net investment in lease, off-balance sheet credit exposure, and available-for-sale debt security.

+ References + Details

Property and Equipment Level 1 (Notes)

3 Months Ended

Mar. 31, 2020

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure [Text Block]

Property and Equipment

Property and equipment consists of the following:



	As of March 31,			As of December 31,
	2020			2019
	(in millions)
Furniture and equipment	$	2.6		$	2.5
Leasehold improvements	6.1			6.0
Computers and software	61.6			60.3
Automobiles	1.1			1.1
Property and equipment, gross	71.4			69.9
Accumulated depreciation	(49.8		)	(48.0		)
Property and equipment, net	$	21.6		$	21.9

Depreciation expenses related to property and equipment for the three months ended March 31, 2020 were $2.1 million, and $9.0 million for the year ended December 31, 2019. Internally developed software costs of $0.8 million were capitalized during the three months ended March 31, 2020, and $3.2 million in internally developed software costs were capitalized during the year ended December 31, 2019.

Cloud Computing Arrangements

The Company’s capitalized costs associated with cloud computing arrangements totaled $36.5 million and $33.6 million, which were comprised of service contract fees and implementation costs associated with hosting arrangements on the Company’s Consolidated Balance Sheets as of March 31, 2020 and December 31, 2019, respectively. Total amortization for hosting arrangements was $1.6 million and $5.3 million for the three months ended March 31, 2020 and the year ended December 31, 2019, respectively.

Leases

The Company determines if an arrangement is a lease at the inception of the transaction. Operating leases for offices are presented as a right-of-use asset (ROU asset) and lease liability on the Company’s Consolidated Balance Sheets. Financing leases for automobiles are included in property and equipment and other liabilities on the Company’s Consolidated Balance Sheets.

ROU assets represent the right to use an underlying asset for the lease term and the lease liability represents the obligation to make lease payments arising from the lease transaction. Operating lease ROU assets and liabilities are recognized at the commencement date based on the present value of the lease payments over the lease term. The Company uses collateralized incremental borrowing rates to determine the present value of lease payments. The ROU assets also include lease payments less any lease incentives within a lease agreement. The Company’s lease terms may include options to extend or terminate a lease. Lease expense for lease payments is recognized on a straight-line basis over the lease term. The Company’s operating leases have remaining terms of 1

year to 7 years, with options to extend up to 10 years with no termination provision. The Company’s finance leases have an option to terminate after 1 year.

Components of lease expense were as follows:



	Three Months Ended
	March 31,
	2020		2019
	(in millions)
Operating lease expense	$	1.3	$	1.3
Finance lease expense	0.1		0.1
Total lease expense	$	1.4	$	1.4

As of March 31, 2020, the weighted average remaining lease term for operating leases was 5.7 years and for finance leases was 3.0 years. The weighted average discount rate was 3.2% and 3.7% for operating and finance leases, respectively.

Maturities of lease liabilities were as follows:



	As of March 31, 2020
	Operating Leases			Finance Leases
	(in millions)
2020	$	3.6		$	0.2
2021	3.4			0.2
2022	2.3			0.1
2023	2.3			0.1
2024	2.2			—
Thereafter	4.6			—
Total lease payments	18.4			0.6
Less: imputed interest	(1.6		)	—
Total	$	16.8		$	0.6

Supplemental balance sheet information related to leases was as follows:



	As of March 31,			As of December 31,
	2020			2019
	(in millions)
Operating leases:
Operating lease right-of-use asset	$	14.9		$	15.9
Operating lease liability	16.8			17.8
Finance leases:
Property and equipment, gross	1.1			1.1
Accumulated depreciation	(0.6		)	(0.5		)
Property and equipment, net	0.5			0.6
Other liabilities	$	0.6		$	0.6

Supplemental cash flow information related to leases was as follows:



	Three Months Ended
	March 31,
	2020		2019
	(in millions)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used for operating leases	$	1.3	$	1.3
Financing cash flows used for finance leases	0.1		0.1

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2020
Income Taxes [Abstract]
Income Taxes	Income Taxes The Company’s effective tax rates were 23.0% and 16.2% for the three months ended March 31, 2020 and 2019, respectively. The increase in the effective rate was due primarily to having a higher proportion of fully deductible losses in the current period versus the proportion of fully taxable income a year ago, as well as the impact of state income taxes.

Liability for Unpaid Losses and Loss Adjustment Expenses

3 Months Ended

Mar. 31, 2020

Liability for Unpaid Losses and Loss Adjustment Expenses [Abstract]

Liability for Unpaid Losses and Loss Adjustment Expenses

The following table represents a reconciliation of changes in the liability for unpaid losses and LAE.



	Three Months Ended
	March 31,
	2020			2019
	(in millions)
Unpaid losses and LAE at beginning of period	$	2,192.8		$	2,207.9
Less reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE	532.5			504.4
Net unpaid losses and LAE at beginning of period	1,660.3			1,703.5
Losses and LAE, net of reinsurance, incurred during the period related to:
Current period	110.2			113.3
Prior periods	(3.5		)	(22.2		)
Total net losses and LAE incurred during the period	106.7			91.1
Paid losses and LAE, net of reinsurance, related to:
Current period	6.9			7.4
Prior periods	95.4			96.6
Total net paid losses and LAE during the period	102.3			104.0
Ending unpaid losses and LAE, net of reinsurance	1,664.7			1,690.6
Reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE	527.0			498.7
Unpaid losses and LAE at end of period	$	2,191.7		$	2,189.3

Total net losses and LAE included in the above table exclude amortization of the deferred reinsurance gain—LPT Agreement, LPT Reserve Adjustments, and LPT Contingent Commission Adjustments, which totaled $2.4 million and $2.5 million for the three months ended March 31, 2020 and 2019, respectively (See Note 9).

The change in incurred losses and LAE attributable to prior periods for the three months ended March 31, 2020 included $3.0 million of favorable development on the Company’s voluntary risk business and $0.5 million of favorable development on the Company’s assigned risk business. The change in incurred losses and LAE attributable to prior periods for the three months ended March 31, 2019 included $22.0 million of favorable development on the Company’s voluntary risk business and $0.2 million of favorable development on the Company’s assigned risk business. The favorable prior accident year loss development on voluntary business during the three months ended March 31, 2020 was the result of observed favorable loss cost trends, primarily for accident years 2010 and prior. The favorable prior accident year loss development on voluntary business during the three months ended March 31, 2019 was the result of observed favorable loss cost trends, primarily for the 2014 through 2017 accident years, which have been impacted by the Company's internal initiatives to reduce loss costs, including the accelerated claims settlement activity that began in 2014 and that has continued into 2020.

LPT Agreement	3 Months Ended
LPT Agreement	Mar. 31, 2020
LPT Agreement [Abstract]
LPT Agreement	LPT Agreement The Company is party to the LPT Agreement under which $1.5 billion in liabilities for losses and LAE related to claims incurred by the Fund prior to July 1, 1995 were reinsured for consideration of $775.0 million. The LPT Agreement provides coverage up to $2.0 billion. The Company records its estimate of contingent profit commission in the accompanying Consolidated Balance Sheets as Contingent commission receivable–LPT Agreement and a corresponding liability is recorded in the accompanying Consolidated Balance Sheets in Deferred reinsurance gain–LPT Agreement. The Deferred Gain is being amortized using the recovery method. Amortization is determined by the proportion of actual reinsurance recoveries to total estimated recoveries over the life of the LPT Agreement, except for the contingent profit commission, which is amortized through June 30, 2024, the date through which the Company is entitled to receive a contingent profit commission under the LPT Agreement. The amortization is recorded in losses and LAE incurred in the accompanying consolidated statements of comprehensive income. Any adjustments to the Deferred Gain are recorded in losses and LAE incurred in the accompanying consolidated statements of comprehensive income. The Company amortized $2.4 million and $2.5 million of the Deferred Gain for the three months ended March 31, 2020 and 2019, respectively. The remaining Deferred Gain was $134.7 million and $137.1 million as of March 31, 2020 and December 31, 2019, respectively. The estimated remaining liabilities subject to the LPT Agreement were $374.6 million and $380.4 million as of March 31, 2020 and December 31, 2019, respectively. Losses and LAE paid with respect to the LPT Agreement totaled $801.9 million and $796.2 million from inception through March 31, 2020 and December 31, 2019, respectively.

Notes Payable Level 1 (Notes)	3 Months Ended
Notes Payable Level 1 (Notes)	Mar. 31, 2020
Notes Payable [Abstract]
Debt Disclosure [Text Block]	Financing Arrangements EICN, ECIC, EPIC, and EAC are members of the FHLB. Membership allows the insurance subsidiaries access to collateralized advances, which may be used to support and enhance liquidity management. The amount of advances that may be taken is dependent on statutory admitted assets on a per company basis. Currently, none of the Company’s insurance subsidiaries has advances outstanding under the FHLB facility. FHLB membership also allows the Company’s insurance subsidiaries access to standby letters of credit. On March 9, 2018, ECIC, EPIC, and EAC entered into standby Letter of Credit Reimbursement Agreements (Letter of Credit Agreements) with the FHLB. On March 1, 2019, FHLB and ECIC amended its Letter of Credit Agreement to increase its credit amount and on March 2, 2020, FHLB and EAC and EPIC each amended their Letter of Credit Agreements to increase their respective credit amounts. The Letter of Credit Agreements are between the FHLB and each of EAC, in the amount of $80.0 million, ECIC, in the amount of $90.0 million, and EPIC, in the amount of $125.0 million. The amended Letter of Credit Agreements will expire March 31, 2021, and will remain evergreen with automatic one-year extensions unless the FHLB notifies the beneficiary at least 60 days prior to the then applicable expiration date of its election not to renew. The Letter of Credit Agreements may only be used to satisfy, in whole or in part, insurance deposit requirements with the State of California and are fully secured with eligible collateral at all times. The Letter of Credit Agreements are subject to annual maintenance charges and a fee of 15 basis points on issued amounts. As of March 31, 2020 and December 31, 2019, letters of credit totaling $295.0 million and $260.0 million, respectively, were issued in lieu of securities on deposit with the State of California under these Letter of Credit Agreements. As of March 31, 2020 and December 31, 2019, investment securities having a fair value of $402.2 million and $326.8 million, respectively, were pledged to the FHLB by the Company’s insurance subsidiaries in support of the collateralized advance facility and the Letter of Credit Agreements.

Accumulated Other Comprehensive Income

3 Months Ended

Mar. 31, 2020

Accumulated Other Comprehensive Income [Abstract]

Accumulated Other Comprehensive Income, Net

Accumulated Other Comprehensive Income

Accumulated other comprehensive income is comprised of unrealized gains on investments classified as AFS, net of deferred tax expense. The following table summarizes the components of accumulated other comprehensive income:



	March 31, 2020			December 31, 2019
	(in millions)
Net unrealized gains on investments, before taxes	$	52.7		$	82.6
Deferred tax expense on net unrealized gains	(11.1		)	(17.3		)
Total accumulated other comprehensive income	$	41.6		$	65.3

Stock-Based Compensation

3 Months Ended

Mar. 31, 2020

Stock-Based Compensation [Abstract]

Stock-Based compensation

Stock-Based Compensation

The Company awarded restricted stock units (RSUs) and performance share units (PSUs) to certain employees and non-employee Directors of the Company as follows:



	Number Awarded	Weighted Average Fair Value on Date of Grant		Aggregate Fair Value on Date of Grant
				(in millions)
March 2020
RSUs⁽¹⁾	77,560	$	37.81	$	2.9
PSUs⁽²⁾	105,180	37.81		4.0


(1)	The RSUs awarded in March 2020 were awarded to certain employees of the Company and vest 25% on March 15, 2021, and each of the subsequent three anniversaries of that date. The RSUs are subject to accelerated vesting in certain circumstances, including but not limited to: death, disability, retirement, or in connection with a change of control of the Company.


(2)	The PSUs awarded in March 2020 were awarded to certain employees of the Company and have a performance period of two years followed by an additional one year vesting period. The PSU awards are subject to certain performance goals with payouts that range from 0% to 200% of the target awards. The value shown in the table represents the aggregate number of PSUs awarded at the target level.

Employees who were awarded RSUs and PSUs are entitled to receive dividend equivalents, payable in cash, when the underlying award vests and becomes payable. If the underlying award does not vest or is forfeited, any dividend equivalents with respect to the underlying award will also fail to become payable and will be forfeited.

Stock options exercised totaled 36,500 for the three months ended March 31, 2020, 1,300 for the three months ended March 31, 2019, and 31,630 for the year ended December 31, 2019.

As of March 31, 2020, the Company had 117,516 options, 259,485 RSUs, and 280,893 PSUs (based on target number awarded) outstanding.

Earnings Per Share

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Earnings Per Share

Basic earnings per share is computed by dividing net income by the weighted average number of shares outstanding for the period. Diluted earnings per share reflects the potential dilutive impact of all common stock equivalents on earnings per share. Diluted earnings per share includes shares that are assumed to be issued under the “treasury stock method,” which reflects the potential dilution that would occur if outstanding RSUs and PSUs had vested and options were to be exercised.

Certain stock-based compensation awards are eligible to receive dividend equivalents on awards that fully vest or become payable. The dividend equivalents are reflected in the Company’s net income; therefore, these awards are not considered participating securities for the purposes of determining earnings per share.

The following table presents the net income and the weighted average number of shares outstanding used in the earnings per common share calculations.



	Three Months Ended
	March 31,
	2020			2019
	(in millions, except share data)
Net (loss) income—basic and diluted	$	(34.9	)	$	51.8
Weighted average number of shares outstanding—basic	30,697,496			32,442,287
Effect of dilutive securities:
PSUs	331,806			346,624
Stock options	64,539			80,138
RSUs	62,308			85,030
Dilutive potential shares	458,653			511,792
Weighted average number of shares outstanding—diluted	31,156,149			32,954,079

Segment Reporting Level 1 (Notes)

3 Months Ended

Mar. 31, 2020

Segment Reporting [Abstract]

Segment Reporting Disclosure [Text Block]

Segment Reporting

The Company has recently made changes to its corporate structure, mainly involving the launch and further development of a new digital insurance platform offered under the Cerity brand name (Cerity). As of December 31, 2019, the Company has determined that it has two reportable segments: Employers and Cerity. Each of these segments represents a separate and distinct underwriting platform through which the Company conducts insurance business. The nature and composition of each reportable segment and its Corporate and Other activities are as follows:

The Employers segment is defined as traditional business offered through the EMPLOYERS brand name (Employers) through its agents, including business originated from the Company's strategic partnerships and alliances.

The Cerity segment is defined as business offered under the Cerity brand name, which includes the Company's direct-to-customer business.

Corporate and Other activities consist of those holding company expenses that are not considered to be underwriting in nature, the financial impact of the LPT agreement, and legacy business assumed and ceded by CIC. These expenses are not considered to be part of a reportable segment and are not otherwise allocated to a reportable segment.

The Company has determined that it is not practicable to report identifiable assets by segment since certain assets are used interchangeably among the segments.

Prior to December 31, 2019, the Company operated under a single reportable segment. All periods prior to December 31, 2019 presented herein have been conformed to the current presentation.

The following table summarizes the Company's written premium and components of net income before income taxes by reportable segment.



	Employers			Cerity			Corporate and Other			Total
	(in millions)
Three Months Ended March 31, 2020
Gross premiums written	$	184.7		$	—		$	—		$	184.7
Net premiums written	183.4			—			—			183.4

Net premiums earned	167.9			—			—			167.9
Net investment income	18.6			0.8			0.5			19.9
Net realized and unrealized losses on investments	(57.3		)	(1.7		)	(2.1		)	(61.1		)
Other income	0.3			—			—			0.3
Total revenues	129.5			(0.9		)	(1.6		)	127.0

Losses and loss adjustment expenses	106.7			—			(2.4		)	104.3
Commission expense	21.3			—			—			21.3
Underwriting and general and administrative expenses	39.2			3.8			3.7			46.7
Total expenses	167.2			3.8			1.3			172.3

Net loss before income taxes	$	(37.7	)	$	(4.7	)	$	(2.9	)	$	(45.3	)



	Employers		Cerity			Corporate and Other			Total
	(in millions)
Three Months Ended March 31, 2019
Gross premiums written	$	210.0	$	—		$	—		$	210.0
Net premiums written	208.7		—			—			208.7

Net premiums earned	174.8		—			—			174.8
Net investment income	20.6		—			1.2			21.8
Net realized and unrealized gains on investments	20.8		—			2.5			23.3
Other income	0.4		—			—			0.4
Total revenues	216.6		—			3.7			220.3

Losses and loss adjustment expenses	91.1		—			(2.5		)	88.6
Commission expense	22.0		—			—			22.0
Underwriting and general and administrative expenses	39.3		3.5			4.7			47.5
Interest and financing expenses	0.4		—			—			0.4
Total expenses	152.8		3.5			2.2			158.5

Net income (loss) before income taxes	$	63.8	$	(3.5	)	$	1.5		$	61.8

Entity-Wide Disclosures

The Company operates solely within the U.S. and does not have revenue from transactions with a single customer accounting for 10% or more of its revenues. The following table shows the Company's in-force premiums and number of policies in-force for each state with approximately five percent or more of our in-force premiums and all other states combined for the periods presented:



	March 31, 2020			December 31, 2019			March 31, 2019			December 31, 2018
State	In-force Premiums		Policies In-force	In-force Premiums		Policies In-force	In-force Premiums		Policies In-force	In-force Premiums		Policies In-force
	(dollars in millions)
California	$	309.5	42,794	$	329.8	43,079	$	353.9	42,973	$	357.1	41,988
Florida	37.3		6,110	36.3		5,822	40.8		5,753	41.0		5,833
New York	31.3		6,302	31.7		5,679	26.2		4,185	23.9		3,663
Other (43 states and D.C.)	264.5		46,223	266.8		44,104	253.6		40,953	244.2		40,014
Total	$	642.6	101,429	$	664.6	98,684	$	674.5	93,864	$	666.2	91,498

Valuation of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2020

Fair Value of Financial Instruments [Abstract]

Estimated fair value of financial instruments table

The carrying value and the estimated fair value of the Company’s financial instruments at fair value were as follows:



	March 31, 2020				December 31, 2019
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
	(in millions)
Financial assets
Total investments at fair value	$	2,582.4	$	2,582.4	$	2,742.6	$	2,742.6
Cash and cash equivalents	174.1		174.1		154.9		154.9
Restricted cash and cash equivalents	0.3		0.3		0.3		0.3

Fair value, assets and liabilities measured on recurring basis table

The following table presents the Company’s investments at fair value and the corresponding fair value measurements.



	March 31, 2020						December 31, 2019
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
	(in millions)
Fixed maturity securities:
U.S. Treasuries	$	—	$	91.1	$	—	$	—	$	85.6	$	—
U.S. Agencies	—		3.1		—		—		2.9		—
States and municipalities	—		422.4		—		—		484.5		—
Corporate securities	—		971.9		—		—		1,079.0		—
Residential mortgage-backed securities	—		497.6		—		—		480.4		—
Commercial mortgage-backed securities	—		105.0		—		—		110.6		—
Asset-backed securities	—		49.9		—		—		61.2		—
Collateralized loan obligations	—		74.3		—		—		—		—
Other securities	—		152.1		—		—		181.7		—
Total fixed maturity securities	$	—	$	2,367.4	$	—	$	—	$	2,485.9	$	—
Equity securities at fair value:
Industrial and miscellaneous	$	172.3	$	—	$	—	$	216.4	$	—	$	—
Other	33.4		—		—		40.3		—		—
Total equity securities at fair value	$	205.7	$	—	$	—	$	256.7	$	—	$	—
Short-term investments	$	9.3	$	—	$	—	$	—	$	—	$	—
Total investments at fair value	$	215.0	$	2,367.4	$	—	$	256.7	$	2,485.9	$	—

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]

Financial Instruments Carried at Net Asset Value (NAV)

Additionally, certain cash equivalents, principally money market securities, are measured using NAV, which approximates fair value.

The following table presents cash and investments carried at NAV on the Company’s Consolidated Balance Sheets.



	March 31, 2020		December 31, 2019
	(in millions)
Cash equivalents carried at NAV	$	72.5	$	14.4
Other invested assets carried at NAV	11.4		9.1

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

Investments (Tables)

3 Months Ended

Mar. 31, 2020

Investments [Abstract]

Available-for-sale securities table

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the Company’s available-for-sale (AFS) investments were as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(in millions)
At March 31, 2020
Fixed maturity securities
U.S. Treasuries	$	86.0	$	5.1	$	—		$	91.1
U.S. Agencies	2.8		0.3		—			3.1
States and municipalities	397.2		25.5		(0.3		)	422.4
Corporate securities	947.4		31.0		(6.5		)	971.9
Residential mortgage-backed securities	476.8		22.0		(1.2		)	497.6
Commercial mortgage-backed securities	104.4		2.9		(2.3		)	105.0
Asset-backed securities	52.0		0.2		(2.3		)	49.9
Collateralized loan obligations	83.0		—		(8.7		)	74.3
Other securities	165.1		0.1		(13.1		)	152.1
Total fixed maturity securities	$	2,314.7	87.1		(34.4		)	$	2,367.4
Short-term investments	9.3		—		—			9.3
Total AFS investments	$	2,324.0	$	87.1	$	(34.4	)	$	2,376.7



At December 31, 2019
Fixed maturity securities
U.S. Treasuries	$	83.7	$	1.9	$	—		$	85.6
U.S. Agencies	2.8		0.1		—			2.9
States and municipalities	458.2		26.3		—			484.5
Corporate securities	1,038.6		40.4		—			1,079.0
Residential mortgage-backed securities	471.7		9.4		(0.7		)	480.4
Commercial mortgage-backed securities	107.4		3.2		—			110.6
Asset-backed securities	60.4		0.9		(0.1		)	61.2
Other securities	180.5		1.6		(0.4		)	181.7
Total AFS investments	$	2,403.3	83.8		(1.2		)	$	2,485.9

Equity securities table

The cost and estimated fair value of the Company’s equity securities recorded at fair value at March 31, 2020 and December 31, 2019 were as follows:



	Cost		Estimated Fair Value
	(in millions)
At March 31, 2020
Equity securities at fair value
Industrial and miscellaneous	$	139.1	$	172.3
Other	34.7		33.4
Total equity securities at fair value	$	173.8	$	205.7



At December 31, 2019
Equity securities at fair value
Industrial and miscellaneous	$	129.1	$	216.4
Other	26.5		40.3
Total equity securities at fair value	$	155.6	$	256.7

Other invested assets

Investments classified by contractual maturity date table



	Amortized Cost		Estimated Fair Value
	(in millions)
Due in one year or less	$	88.5	$	88.1
Due after one year through five years	655.8		668.8
Due after five years through ten years	786.8		813.1
Due after ten years	67.4		70.6
Mortgage and asset-backed securities	716.2		726.8
Total	$	2,314.7	$	2,367.4

Unrealized loss on investments table



	March 31, 2020						December 31, 2019
	Estimated Fair Value		Gross Unrealized Losses			Number of Issues	Estimated Fair Value		Gross Unrealized Losses			Number of Issues
	(in millions, except number of issues data)
Less than 12 months:
Fixed maturity securities
States and municipalities	$	17.5	$	(0.3	)	4	$	—	$	—		—
Corporate securities	166.2		(6.5		)	67	—		—			—
Residential mortgage-backed securities	15.2		(1.2		)	6	56.9		(0.2		)	29
Commercial mortgage-backed securities	25.6		(2.3		)	19	—		—			—
Asset-backed securities	39.2		(2.3		)	31	10.1		(0.1		)	6
Collateralized loan obligations	71.8		(8.7		)	19	—		—			—
Other securities	144.1		(12.9		)	297	15.2		(0.3		)	64
Total less than 12 months	$	479.6	$	(34.2	)	443	$	82.2	$	(0.6	)	99

12 months or greater:
Fixed maturity securities
Residential mortgage-backed securities	$	—	$	—		—	$	40.0	$	(0.5	)	19
Other securities	2.4		(0.2		)	13	5.9		(0.1		)	19
Total 12 months or greater	$	2.4	$	(0.2	)	13	$	45.9	$	(0.6	)	38

Unrealized gain (loss) on investments



	Gross Realized Gains		Gross Realized Losses			Change in Net Unrealized Gains (Losses)			Changes in Fair Value Reflected in Earnings			Changes in Fair Value Reflected in AOCI, before tax
	(in millions)
Three Months Ended March 31, 2020
Fixed maturity securities	$	4.1	$	(11.0	)	$	(29.9	)	$	(6.9	)	$	(29.9	)
Equity securities	22.7		(7.3		)	(69.2		)	(53.8		)	—
Other invested assets	—		—			(0.4		)	(0.4		)	—
Total investments	$	26.8	$	(18.3	)	$	(99.5	)	$	(61.1	)	$	(29.9	)



Three Months Ended March 31, 2019
Fixed maturity securities	$	1.0	$	(0.4	)	$	47.2	$	0.6	$	47.2
Equity securities	1.6		(0.1		)	21.2		22.7		—
Total investments	$	2.6	$	(0.5	)	$	68.4	$	23.3	$	47.2

Investment income table

Net investment income was as follows:



	Three Months Ended
	March 31,
	2020			2019
	(in millions)
Fixed maturity securities	$	19.3		$	20.4
Equity securities	1.3			1.9
Other invested assets	0.6			—
Short term investments	0.1			—
Cash equivalents and restricted cash	0.2			0.5
Gross investment income	21.5			22.8
Investment expenses	(1.6		)	(1.0		)
Net investment income	$	19.9		$	21.8

Current Expected Credit Losses (Tables)

3 Months Ended

Mar. 31, 2020

Credit Loss [Abstract]

Premium Receivable, Allowance for Credit Loss [Table Text Block]

The table below shows the changes in the allowance for expected credit losses on premiums receivable.



	Three Months Ended
	March 31,
	2020
	(in millions)
Beginning balance of the allowance for expected credit losses on premiums receivable	$	4.6
Current period provision for expected credit losses	4.1
Write-offs charged against the allowance	(4.8		)
Ending balance of the allowance for expected credit losses on premiums receivable	$	3.9

Reinsurance Recoverable, Allowance for Credit Loss [Table Text Block]

The table below shows the changes in the allowance for expected credit losses on reinsurance recoverables.



	Three Months Ended
	March 31,
	2020
	(in millions)
Beginning balance of the allowance for expected credit losses on reinsurance recoverables	$	—
Current period provision for expected credit losses	0.4
Ending balance of the allowance for expected credit losses on reinsurance recoverables	$	0.4

Debt Securities, Available-for-sale, Allowance for Credit Loss [Table Text Block]

The table below shows the changes in the allowance for expected credit losses on available-for-sale securities.



	Three Months Ended
	March 31,
	2020
	(in millions)
Beginning balance of the allowance for expected credit losses on AFS securities	$	—
Current period provision for expected credit losses	10.7
Ending balance of the allowance for expected credit losses on AFS securities	$	10.7

Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2020

Property, Plant and Equipment [Abstract]

Property and Equipment [Table Text Block]

Property and equipment consists of the following:



	As of March 31,			As of December 31,
	2020			2019
	(in millions)
Furniture and equipment	$	2.6		$	2.5
Leasehold improvements	6.1			6.0
Computers and software	61.6			60.3
Automobiles	1.1			1.1
Property and equipment, gross	71.4			69.9
Accumulated depreciation	(49.8		)	(48.0		)
Property and equipment, net	$	21.6		$	21.9

Lease, Cost [Table Text Block]

Components of lease expense were as follows:



	Three Months Ended
	March 31,
	2020		2019
	(in millions)
Operating lease expense	$	1.3	$	1.3
Finance lease expense	0.1		0.1
Total lease expense	$	1.4	$	1.4

Lessee, Operating and Finance Lease Liability Maturity [Table Text Block]

Maturities of lease liabilities were as follows:



	As of March 31, 2020
	Operating Leases			Finance Leases
	(in millions)
2020	$	3.6		$	0.2
2021	3.4			0.2
2022	2.3			0.1
2023	2.3			0.1
2024	2.2			—
Thereafter	4.6			—
Total lease payments	18.4			0.6
Less: imputed interest	(1.6		)	—
Total	$	16.8		$	0.6

Supplemental Balance Sheet Information related to Leases [Table Text Block]

Supplemental balance sheet information related to leases was as follows:



	As of March 31,			As of December 31,
	2020			2019
	(in millions)
Operating leases:
Operating lease right-of-use asset	$	14.9		$	15.9
Operating lease liability	16.8			17.8
Finance leases:
Property and equipment, gross	1.1			1.1
Accumulated depreciation	(0.6		)	(0.5		)
Property and equipment, net	0.5			0.6
Other liabilities	$	0.6		$	0.6

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

Supplemental cash flow information related to leases was as follows:



	Three Months Ended
	March 31,
	2020		2019
	(in millions)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used for operating leases	$	1.3	$	1.3
Financing cash flows used for finance leases	0.1		0.1

Liability for Unpaid Losses and Loss Adjustment Expenses (Tables)

3 Months Ended

Mar. 31, 2020

Liability for Unpaid Losses and Loss Adjustment Expenses [Abstract]

Changes in the liability for unpaid losses and LAE table

The following table represents a reconciliation of changes in the liability for unpaid losses and LAE.



	Three Months Ended
	March 31,
	2020			2019
	(in millions)
Unpaid losses and LAE at beginning of period	$	2,192.8		$	2,207.9
Less reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE	532.5			504.4
Net unpaid losses and LAE at beginning of period	1,660.3			1,703.5
Losses and LAE, net of reinsurance, incurred during the period related to:
Current period	110.2			113.3
Prior periods	(3.5		)	(22.2		)
Total net losses and LAE incurred during the period	106.7			91.1
Paid losses and LAE, net of reinsurance, related to:
Current period	6.9			7.4
Prior periods	95.4			96.6
Total net paid losses and LAE during the period	102.3			104.0
Ending unpaid losses and LAE, net of reinsurance	1,664.7			1,690.6
Reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE	527.0			498.7
Unpaid losses and LAE at end of period	$	2,191.7		$	2,189.3

Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2020

Accumulated Other Comprehensive Income [Abstract]

Schedule of accumulated other comprehensive income (loss) table

The following table summarizes the components of accumulated other comprehensive income:



	March 31, 2020			December 31, 2019
	(in millions)
Net unrealized gains on investments, before taxes	$	52.7		$	82.6
Deferred tax expense on net unrealized gains	(11.1		)	(17.3		)
Total accumulated other comprehensive income	$	41.6		$	65.3

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Stock-Based Compensation [Abstract]

Share-based compensation arrangements by share-based payment award table

The Company awarded restricted stock units (RSUs) and performance share units (PSUs) to certain employees and non-employee Directors of the Company as follows:



	Number Awarded	Weighted Average Fair Value on Date of Grant		Aggregate Fair Value on Date of Grant
				(in millions)
March 2020
RSUs⁽¹⁾	77,560	$	37.81	$	2.9
PSUs⁽²⁾	105,180	37.81		4.0


(1)	The RSUs awarded in March 2020 were awarded to certain employees of the Company and vest 25% on March 15, 2021, and each of the subsequent three anniversaries of that date. The RSUs are subject to accelerated vesting in certain circumstances, including but not limited to: death, disability, retirement, or in connection with a change of control of the Company.


(2)	The PSUs awarded in March 2020 were awarded to certain employees of the Company and have a performance period of two years followed by an additional one year vesting period. The PSU awards are subject to certain performance goals with payouts that range from 0% to 200% of the target awards. The value shown in the table represents the aggregate number of PSUs awarded at the target level.

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Net income and weighted average common shares outstanding used in earnings per share calculations table

The following table presents the net income and the weighted average number of shares outstanding used in the earnings per common share calculations.



	Three Months Ended
	March 31,
	2020			2019
	(in millions, except share data)
Net (loss) income—basic and diluted	$	(34.9	)	$	51.8
Weighted average number of shares outstanding—basic	30,697,496			32,442,287
Effect of dilutive securities:
PSUs	331,806			346,624
Stock options	64,539			80,138
RSUs	62,308			85,030
Dilutive potential shares	458,653			511,792
Weighted average number of shares outstanding—diluted	31,156,149			32,954,079

Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2020

Net Income before income taxes by segment [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]



	Employers			Cerity			Corporate and Other			Total
	(in millions)
Three Months Ended March 31, 2020
Gross premiums written	$	184.7		$	—		$	—		$	184.7
Net premiums written	183.4			—			—			183.4

Net premiums earned	167.9			—			—			167.9
Net investment income	18.6			0.8			0.5			19.9
Net realized and unrealized losses on investments	(57.3		)	(1.7		)	(2.1		)	(61.1		)
Other income	0.3			—			—			0.3
Total revenues	129.5			(0.9		)	(1.6		)	127.0

Losses and loss adjustment expenses	106.7			—			(2.4		)	104.3
Commission expense	21.3			—			—			21.3
Underwriting and general and administrative expenses	39.2			3.8			3.7			46.7
Total expenses	167.2			3.8			1.3			172.3

Net loss before income taxes	$	(37.7	)	$	(4.7	)	$	(2.9	)	$	(45.3	)



	Employers		Cerity			Corporate and Other			Total
	(in millions)
Three Months Ended March 31, 2019
Gross premiums written	$	210.0	$	—		$	—		$	210.0
Net premiums written	208.7		—			—			208.7

Net premiums earned	174.8		—			—			174.8
Net investment income	20.6		—			1.2			21.8
Net realized and unrealized gains on investments	20.8		—			2.5			23.3
Other income	0.4		—			—			0.4
Total revenues	216.6		—			3.7			220.3

Losses and loss adjustment expenses	91.1		—			(2.5		)	88.6
Commission expense	22.0		—			—			22.0
Underwriting and general and administrative expenses	39.3		3.5			4.7			47.5
Interest and financing expenses	0.4		—			—			0.4
Total expenses	152.8		3.5			2.2			158.5

Net income (loss) before income taxes	$	63.8	$	(3.5	)	$	1.5		$	61.8

Revenue from External Customers by Geographic Areas [Table Text Block]



	March 31, 2020			December 31, 2019			March 31, 2019			December 31, 2018
State	In-force Premiums		Policies In-force	In-force Premiums		Policies In-force	In-force Premiums		Policies In-force	In-force Premiums		Policies In-force
	(dollars in millions)
California	$	309.5	42,794	$	329.8	43,079	$	353.9	42,973	$	357.1	41,988
Florida	37.3		6,110	36.3		5,822	40.8		5,753	41.0		5,833
New York	31.3		6,302	31.7		5,679	26.2		4,185	23.9		3,663
Other (43 states and D.C.)	264.5		46,223	266.8		44,104	253.6		40,953	244.2		40,014
Total	$	642.6	101,429	$	664.6	98,684	$	674.5	93,864	$	666.2	91,498

Basis of Presentation Reportable Segments (Details)	3 Months Ended
Basis of Presentation Reportable Segments (Details)	Mar. 31, 2020
Segment Reporting [Abstract]
Number of Reportable Segments	2

Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments at fair value	$ 2,582,400	$ 2,742,600
Total Investments at fair value, estimated fair value	2,582,400	2,742,600
Cash and cash equivalents	174,100	154,900
Cash and cash equivalents, estimated fair value	174,100	154,900
Restricted cash and cash equivalents	300	300
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	$ 300	$ 300

Fair Value of Financial Instruments, Fair Value Inputs (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	$ 2,367,400	$ 2,485,900
Equity Securities, FV-NI	205,700	256,700
Short-term Investments	9,300	0
Investments	2,620,500	2,778,400
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	205,700	256,700
Short-term Investments	9,300	0
Investments	215,000	256,700
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	0	0
Short-term Investments		0
Investments	2,367,400	2,485,900
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	0	0
Short-term Investments	0	0
Investments	0	0
Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	2,367,400	2,485,900
Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	91,100	85,600
US Treasury Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
US Treasury Securities [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	91,100	85,600
US Treasury Securities [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
US Government Agencies Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	3,100	2,900
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	3,100	2,900
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	422,400	484,500
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	422,400	484,500
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	971,900	1,079,000
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	971,900	1,079,000
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	497,600	480,400
Residential Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
Residential Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	497,600	480,400
Residential Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	105,000	110,600
Commercial Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
Commercial Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	105,000	110,600
Commercial Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	49,900	61,200
Asset-backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
Asset-backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	49,900	61,200
Asset-backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
Collateralized Loan Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	74,300
Collateralized Loan Obligations [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
Collateralized Loan Obligations [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	74,300	0
Collateralized Loan Obligations [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
Other Debt Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	152,100	181,700
Other Debt Obligations [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
Other Debt Obligations [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	152,100	181,700
Other Debt Obligations [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	0	0
Industrial and Miscellaneous [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	172,300	216,400
Industrial and Miscellaneous [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	172,300	216,400
Industrial and Miscellaneous [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	0	0
Industrial and Miscellaneous [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	0	0
Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	33,400	40,300
Other [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	33,400	40,300
Other [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	0	0
Other [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	$ 0	$ 0

Valuation of Financial Instruments Investments at NAV (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Investments at NAV [Abstract]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	12 years
Fair value investments entities that calculate net asset value per share liquidating investment original expected lives increments	1 year
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	$ 38.9
Cash Equivalents Measured at Net Asset Value	72.5	$ 14.4
Other invested assets at NAV	$ 11.4	$ 9.1

Investments Available for Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	$ 2,314,700	$ 2,403,300
Debt securities, available-for-sale, gross unrealized gain	87,100	83,800
Debt securities, available-for-sale, gross unrealized loss	(34,400)	(1,200)
Fixed maturity securities, fair value	2,367,400	2,485,900
Total AFS, amortized cost	2,324,000
Total AFS, gross unrealized gain	87,100
Total AFS, gross unrealized loss	34,400
Short-term Investments	9,300	0
Total AFS investments	2,376,700
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	86,000	83,700
Debt securities, available-for-sale, gross unrealized gain	5,100	1,900
Debt securities, available-for-sale, gross unrealized loss	0	0
Fixed maturity securities, fair value	91,100	85,600
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	2,800	2,800
Debt securities, available-for-sale, gross unrealized gain	300	100
Debt securities, available-for-sale, gross unrealized loss	0	0
Fixed maturity securities, fair value	3,100	2,900
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	397,200	458,200
Debt securities, available-for-sale, gross unrealized gain	25,500	26,300
Debt securities, available-for-sale, gross unrealized loss	(300)	0
Fixed maturity securities, fair value	422,400	484,500
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	947,400	1,038,600
Debt securities, available-for-sale, gross unrealized gain	31,000	40,400
Debt securities, available-for-sale, gross unrealized loss	(6,500)	0
Fixed maturity securities, fair value	971,900	1,079,000
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	476,800	471,700
Debt securities, available-for-sale, gross unrealized gain	22,000	9,400
Debt securities, available-for-sale, gross unrealized loss	(1,200)	(700)
Fixed maturity securities, fair value	497,600	480,400
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	104,400	107,400
Debt securities, available-for-sale, gross unrealized gain	2,900	3,200
Debt securities, available-for-sale, gross unrealized loss	(2,300)	0
Fixed maturity securities, fair value	105,000	110,600
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	52,000	60,400
Debt securities, available-for-sale, gross unrealized gain	200	900
Debt securities, available-for-sale, gross unrealized loss	(2,300)	(100)
Fixed maturity securities, fair value	49,900	61,200
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	83,000
Debt securities, available-for-sale, gross unrealized gain	0
Debt securities, available-for-sale, gross unrealized loss	(8,700)
Fixed maturity securities, fair value	74,300
Other Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	165,100	180,500
Debt securities, available-for-sale, gross unrealized gain	100	1,600
Debt securities, available-for-sale, gross unrealized loss	(13,100)	(400)
Fixed maturity securities, fair value	152,100	$ 181,700
Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Total AFS, amortized cost	9,300
Total AFS, gross unrealized gain	0
Total AFS, gross unrealized loss	$ 0

Investments Equity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Equity Securities and Other [Line Items]
Equity Securities, FV-NI, Cost	$ 173,800	$ 155,600
Equity Securities, FV-NI	205,700	256,700
Industrial and Miscellaneous [Member]
Schedule of Equity Securities and Other [Line Items]
Equity Securities, FV-NI, Cost	139,100	129,100
Equity Securities, FV-NI	172,300	216,400
Other [Member]
Schedule of Equity Securities and Other [Line Items]
Equity Securities, FV-NI, Cost	34,700	26,500
Equity Securities, FV-NI	$ 33,400	$ 40,300

Investments Other Invested Assets (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Other Invest Assets [Abstract]
Other invested assets at NAV	$ 11.4	$ 9.1
Investment Owned, at Cost	11.1	8.4
Total other invested assets	31.4	$ 29.1
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures	$ 20.0

Investments, Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less, amortized cost	$ 88,500
Due after one year through five years, amortized cost	655,800
Due after five years through ten years, amortized cost	786,800
Due after ten years, amortized cost	67,400
Mortgage and asset-backed securities, amortized cost	716,200
Total, amortized cost	2,314,700	$ 2,403,300
Estimated Fair Value
Due in one year or less, fair value	88,100
Due after one year through five years, fair value	668,800
Due after five years through ten years, fair value	813,100
Due after ten years, fair value	70,600
Mortgage and asset-backed securities, fair value	726,800
Total, fair value	$ 2,367,400	$ 2,485,900

Investments, Continuous Loss Position (Details)	3 Months Ended
Investments, Continuous Loss Position (Details)	Mar. 31, 2020 USD ($) shares	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	$ 10,700,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	479,600,000		$ 82,200,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,400,000		45,900,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(34,200,000)		(600,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (200,000)		$ (600,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, less than 12 months	443		99
Debt Securities, number of issues in loss position, 12 months or greater	13		38
Other than temporary impairment, credit losses recognized in earnings	$ 0	$ 0
Debt Securities [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Other than temporary impairment, credit losses recognized in earnings	0
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	17,500,000		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (300,000)		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, less than 12 months	4		0
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 166,200,000		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (6,500,000)		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, less than 12 months	67		0
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 15,200,000		$ 56,900,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0		40,000,000.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,200,000)		(200,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0		$ (500,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, less than 12 months	6		29
Debt Securities, number of issues in loss position, 12 months or greater	0		19
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 25,600,000		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (2,300,000)		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, less than 12 months	19		0
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 39,200,000		$ 10,100,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (2,300,000)		$ (100,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, less than 12 months	31		6
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 71,800,000		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (8,700,000)		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, less than 12 months	19		0
Other Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 144,100,000		$ 15,200,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,400,000		5,900,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(12,900,000)		(300,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (200,000)		$ (100,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Debt Securities, number of issues in loss position, less than 12 months	297		64
Debt Securities, number of issues in loss position, 12 months or greater	13		19

Investments Investments, Net Realized Gains and Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Equity securities:
Equity Securities, FV-NI, Realized Gain	$ 22.7	$ 1.6
Equity Securities, FV-NI, Realized Loss	7.3	0.1
AFS, change in unrealized gains (losses)
AFS, change unrealized gains (losses) on fixed maturity and equity securities reflected in AOCI	(29.9)	47.2
AFS, net realized gains (losses)
Net realized and unrealized (losses) gains on investments	(61.1)	23.3
Total gross realized gains	26.8	2.6
Investments, Gross Realized Losses	(18.3)	(0.5)
Total change in net unrealized gains (losses)	(99.5)	68.4
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Equity Securities, FV-NI, Unrealized Gain (Loss)	(69.2)	21.2
Proceeds from sale of fixed maturity securities	220.2	51.2
Debt Securities [Member]
AFS, change in unrealized gains (losses)
AFS, change unrealized gains (losses) on fixed maturity and equity securities reflected in AOCI	(29.9)	47.2
AFS, net realized gains (losses)
AFS, Gross gains from sales	4.1	1.0
AFS, Gross losses from sales	(11.0)	(0.4)
Net realized and unrealized (losses) gains on investments	(6.9)	0.6
Equity Securities [Member]
AFS, change in unrealized gains (losses)
AFS, change unrealized gains (losses) on fixed maturity and equity securities reflected in AOCI	0.0	0.0
AFS, net realized gains (losses)
Net realized and unrealized (losses) gains on investments	(53.8)	$ 22.7
Other Investments [Member]
AFS, change in unrealized gains (losses)
AFS, change unrealized gains (losses) on fixed maturity and equity securities reflected in AOCI	0.0
AFS, net realized gains (losses)
Net realized and unrealized (losses) gains on investments	(0.4)
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Trading Securities, Realized Gain	0.0
Trading Securities, Realized Loss	0.0
Trading Securities, Change in Unrealized Holding Gain (Loss)	$ (0.4)

Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended
Net Investment Income (Details) - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 21.5	$ 22.8
Investment expenses	1.6	1.0
Net investment income	19.9	21.8
Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income	19.3	20.4
Equity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income	1.3	1.9
Other Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income	0.6	0.0
Short-term Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income	0.1	0.0
Cash and Cash Equivalents [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income	$ 0.2	$ 0.5

Investments Investments, Held in Trust or on Deposit (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Line of Credit Facility [Line Items]
Other invested assets (cost $31.1 at March 31, 2020 and $28.4 at December 31, 2019)	$ 31.4	$ 29.1
Deposit Assets [Abstract]
Investments	2,620.5	2,778.4
Assets Held-in-trust [Abstract]
Funds Held under Reinsurance Agreements, Asset	3.3	2.9
Federal Home Loan Bank [Member]
Deposit Assets [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	295.0	260.0
Required by various state laws and regulations to hold securities or letters of credit in depository account [Member]
Deposit Assets [Abstract]
Investments	$ 837.2	$ 844.9

Current Expected Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Current Expected Credit Losses [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	$ 3,900	$ 4,600
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	4,100
Accounts Receivable, Allowance for Credit Loss, Writeoff	(4,800)
Debt Securities, Available-for-sale, Allowance for Credit Loss	10,700	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	10,700
Reinsurance recoverables on unpaid losses, allowance	400	0
Reinsurance Recoverable, Allowance for Credit Loss, Period Increase (Decrease)	400
Accrued investment income	$ 16,800	$ 16,400

Property and Equipment Property and Equipment (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Property and Equipment [Line Items]
Property and equipment, gross	$ 71.4		$ 69.9
Accumulated depreciation, depletion and amortization, property and equipment	(49.8)		(48.0)
Property and equipment, net	21.6		21.9
Utilities operating expense, depreciation and amortization	2.1		9.0
Payments to develop software	0.8		3.2
Cloud computing arrangements	36.5		33.6
Amortization of cloud computing arrangements	1.6	$ 1.0	5.3
Furniture and equipment
Property and Equipment [Line Items]
Property and equipment, gross	2.6		2.5
Leasehold improvements
Property and Equipment [Line Items]
Property and equipment, gross	6.1		6.0
Computer and software
Property and Equipment [Line Items]
Property and equipment, gross	61.6		60.3
Automobiles
Property and Equipment [Line Items]
Property and equipment, gross	$ 1.1		$ 1.1

Property and Equipment Leases (Details)	3 Months Ended
Property and Equipment Leases (Details)	Mar. 31, 2020
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, operating lease, remaining lease term	1 year
Lessee, Finance Lease, Term of Contract	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, operating lease, remaining lease term	7 years
Lessee, operating lease, renewal term	10 years

Property and Equipment Leases, Components of Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Components of Lease Expense [Abstract]
Operating lease expense	$ 1.3	$ 1.3
Finance lease expense	0.1	0.1
Total lease expense	$ 1.4	$ 1.4

Property and Equipment Leases, Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Lessee, operating lease liabilities due
Operating lease liabilities due next twelve months	$ 3.6
Operating lease liabilities due year two	3.4
Operating lease liabilities due year three	2.3
Operating lease liabilities due year four	2.3
Operating lease liabilities due year five	2.2
Operating lease liabilities due after year five	4.6
Operating lease liabilities due	18.4
Less: inputed interest, Operating lease liability	(1.6)
Operating lease liability	$ 16.8	$ 17.8
Operating lease, weighted average remaining lease term	5 years 8 months 12 days
Operating lease, weighted average discount rate, percent	3.20%
Lessee, finance lease liabilities due
Finance lease liabilities due next twelve months	$ 0.2
Finance lease liabilities due year two	0.2
Finance lease liabilities due year three	0.1
Finance lease liabilities due year four	0.1
Finance lease liabilities due year five	0.0
Finance lease liabilities due after year five	0.0
Finance lease liabilities due	0.6
Less: inputed interest, finance lease	0.0
Finance lease, liability	$ 0.6
Finance lease, weighted average remaining lease term	3 years
Finance lease, weighted average discount rate, percent	3.70%

Property and Equipment Leases, Supplement Balance Sheet Information (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 14.9	$ 15.9
Operating lease liability	16.8	17.8
Property and equipment, gross	71.4	69.9
Accumulated depreciation, depletion and amortization, property and equipment	(49.8)	(48.0)
Property and equipment, net	21.6	21.9
Other liabilities	61.9	52.1
Finance leases [Member]
Lessee, Lease, Description [Line Items]
Property and equipment, gross	1.1	1.1
Accumulated depreciation, depletion and amortization, property and equipment	(0.6)	(0.5)
Property and equipment, net	0.5	0.6
Other liabilities	$ 0.6	$ 0.6

Property and Equipment Leases, Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases, Supplement Balance Sheet Information [Abstract]
Operating cash flows from operating leases	$ 1.3	$ 1.3
Financing cash flows from finance leases	$ 0.1	$ 0.1

Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Mar. 31, 2020	Mar. 31, 2019
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory tax rate	21.00%
Effective tax rate	23.00%	16.20%

Liability for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Unpaid losses and LAE at beginning of period	$ 2,192.8	$ 2,207.9
Less reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE	532.5	504.4
Net unpaid losses and LAE at beginning of period	1,660.3	1,703.5
Losses and LAE, net of reinsurance, incurred during the period related to:
Current period	110.2	113.3
Prior periods	(3.5)	(22.2)
Total net losses and LAE incurred during the period	106.7	91.1
Deduct payments for losses and LAE, net of reinsurance, related to:
Current period	6.9	7.4
Prior periods	95.4	96.6
Total net paid losses and LAE during the period	102.3	104.0
Ending unpaid losses and LAE, net of reinsurance	1,664.7	1,690.6
Reinsurance recoverable, excluding CECL allowance, on unpaid losses and LAE	527.0	498.7
Unpaid losses and LAE at end of period	2,191.7	2,189.3
Impact of the LPT Agreement	2.4	2.5
Involuntary Assigned Risk Business [Member]
Losses and LAE, net of reinsurance, incurred during the period related to:
Prior periods	(0.5)	(0.2)
Voluntary Risk Business [Member]
Losses and LAE, net of reinsurance, incurred during the period related to:
Prior periods	$ (3.0)	$ (22.0)

LPT Agreement (Details) - USD ($) $ in Millions	3 Months Ended
LPT Agreement (Details) - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Reinsurance Agreement [Line Items]
Liabilities for the incurred but unpaid losses and LAE related to claims prior to July 1, 1995	$ 1,500.0
Ceded premiums written	775.0
Amortization of deferred gain	2.4	$ 2.5
Net income	(34.9)	$ 51.8
Deferred reinsurance gain—LPT Agreement	134.7		$ 137.1
Estimated remaining liabilities - LPT Agreement	374.6		380.4
Paid losses and LAE claims related to LPT	801.9		$ 796.2
Indemnification Agreement [Member]
Reinsurance Agreement [Line Items]
Coverage provided under LPT Agreement	$ 2,000.0

Notes Payable Letters of Credit (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Letters of Credit Facilities [Line Items]
Letters of credit, unused capacity, commitment fee percentage	0.15%
Federal Home Loan Bank [Member]
Letters of Credit Facilities [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 295.0	$ 260.0
Letters of credit collateral amount	402.2	$ 326.8
Federal Home Loan Bank [Member] \| EAC
Letters of Credit Facilities [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	80.0
Federal Home Loan Bank [Member] \| ECIC
Letters of Credit Facilities [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	90.0
Federal Home Loan Bank [Member] \| EPIC
Letters of Credit Facilities [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 125.0

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income [Abstract]
Net unrealized gains on investments, before taxes	$ 52,700	$ 82,600
Deferred tax expense on net unrealized gains	(11,100)	(17,300)
Total accumulated other comprehensive income	$ 41,600	$ 65,300

Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions

3 Months Ended

12 Months Ended

Mar. 31, 2020

Mar. 31, 2019

Dec. 31, 2019

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-options exercised

36,500

1,300

31,630

Stock Option [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of outstanding options or share units

117,516

Restricted Stock Units (RSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of outstanding options or share units

259,485

Restricted Stock Units (RSUs) [Member] | Officer [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based compensation award, shares issued

^[1]

77,560

Share-based compensation options, exercise price on grant date

^[1]

$ 37.81

Fair value of awards awarded on grant date

^[1]

$ 2.9

Vesting rights for RSUs awarded

vest 25% on March 15, 2021, and each of the subsequent three anniversaries of that date

Performance Shares [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of outstanding options or share units

280,893

Performance Shares [Member] | Officer [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based compensation award, shares issued

^[2]

105,180

Share-based compensation options, exercise price on grant date

^[2]

$ 37.81

Fair value of awards awarded on grant date

^[2]

$ 4.0

Performance share awards performance period

two years

Share-based compensation arrangement by share-based payment award, award vesting period

1 year

Performance share awards, minimum payout

0.00%

Performance share awards, maximum payout

200.00%

[1]	The RSUs awarded in March 2020 were awarded to certain employees of the Company and vest 25% on March 15, 2021, and each of the subsequent three anniversaries of that date. The RSUs are subject to accelerated vesting in certain circumstances, including but not limited to: death, disability, retirement, or in connection with a change of control of the Company.
[2]	The PSUs awarded in March 2020 were awarded to certain employees of the Company and have a performance period of two years followed by an additional one year vesting period. The PSU awards are subject to certain performance goals with payouts that range from 0% to 200% of the target awards. The value shown in the table represents the aggregate number of PSUs awarded at the target level.

Earnings Per Share (Details) - USD ($) $ in Millions	3 Months Ended
Earnings Per Share (Details) - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Net income available to stockholders - basic and diluted	$ (34.9)	$ 51.8
Weighted average number of shares outstanding - basic	30,697,496	32,442,287
Effect of dilutive securities:
Dilutive securities	458,653	511,792
Weighted average number of shares outstanding - diluted	31,156,149	32,954,079
Performance Shares [Member]
Effect of dilutive securities:
Dilutive securities	331,806	346,624
Share-based Payment Arrangement, Option [Member]
Effect of dilutive securities:
Dilutive securities	64,539	80,138
Restricted Stock Units (RSUs) [Member]
Effect of dilutive securities:
Dilutive securities	62,308	85,030

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Segment Reporting Segment Net Income Before Taxes (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments	2
Premiums Written, Gross	$ 184.7	$ 210.0
Premiums Written, Net	183.4	208.7
Net premiums earned	167.9	174.8
Net investment income	19.9	21.8
Net realized and unrealized (losses) gains on investments	(61.1)	23.3
Other income	0.3	0.4
Revenues	127.0	220.3
Losses and loss adjustment expenses	104.3	88.6
Commission expense	21.3	22.0
Underwriting and general and administrative expenses	46.7	47.5
Interest and financing expenses	0.0	0.4
Operating Expenses	172.3	158.5
Net (loss) income before income taxes	(45.3)	61.8
Employers Segment [Member]
Segment Reporting Information [Line Items]
Premiums Written, Gross	184.7	210.0
Premiums Written, Net	183.4	208.7
Net premiums earned	167.9	174.8
Net investment income	18.6	20.6
Net realized and unrealized (losses) gains on investments	(57.3)	20.8
Other income	0.3	0.4
Revenues	129.5	216.6
Losses and loss adjustment expenses	106.7	91.1
Commission expense	21.3	22.0
Underwriting and general and administrative expenses	39.2	39.3
Interest and financing expenses		0.4
Operating Expenses	167.2	152.8
Net (loss) income before income taxes	(37.7)	63.8
Cerity Segment [Member]
Segment Reporting Information [Line Items]
Premiums Written, Gross	0.0	0.0
Premiums Written, Net	0.0	0.0
Net premiums earned	0.0	0.0
Net investment income	0.8	0.0
Net realized and unrealized (losses) gains on investments	(1.7)	0.0
Other income	0.0	0.0
Revenues	(0.9)	0.0
Losses and loss adjustment expenses	0.0	0.0
Commission expense	0.0	0.0
Underwriting and general and administrative expenses	3.8	3.5
Interest and financing expenses		0.0
Operating Expenses	3.8	3.5
Net (loss) income before income taxes	(4.7)	(3.5)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Premiums Written, Gross	0.0	0.0
Premiums Written, Net	0.0	0.0
Net premiums earned	0.0	0.0
Net investment income	0.5	1.2
Net realized and unrealized (losses) gains on investments	(2.1)	2.5
Other income	0.0	0.0
Revenues	(1.6)	3.7
Losses and loss adjustment expenses	(2.4)	(2.5)
Commission expense	0.0	0.0
Underwriting and general and administrative expenses	3.7	4.7
Interest and financing expenses		0.0
Operating Expenses	1.3	2.2
Net (loss) income before income taxes	$ (2.9)	$ 1.5

Segment Reporting Geographic Information (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
CALIFORNIA
Revenue, Major Customer [Line Items]
Premiums In Force	$ 309,500,000	$ 329,800,000	$ 353,900,000	$ 357,100,000
Policies In force	42,794	43,079	42,973	41,988
FLORIDA
Revenue, Major Customer [Line Items]
Premiums In Force	37,300,000	36,300,000	40,800,000	41,000,000.0
Policies In force	6,110	5,822	5,753	5,833
NEW YORK
Revenue, Major Customer [Line Items]
Premiums In Force	31,300,000	31,700,000	26,200,000	23,900,000
Policies In force	6,302	5,679	4,185	3,663
AllOtherStates [Member]
Revenue, Major Customer [Line Items]
Premiums In Force	264,500,000	266,800,000	253,600,000	244,200,000
Policies In force	46,223	44,104	40,953	40,014
UNITED STATES
Revenue, Major Customer [Line Items]
Premiums In Force	642,600,000	664,600,000	674,500,000	666,200,000
Policies In force	$ 101,429	$ 98,684	$ 93,864	$ 91,498