Cover Page - shares	6 Months Ended
Cover Page - shares	Jun. 30, 2019	Jul. 18, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
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		31,915,066
Entity Central Index Key	0001379041
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Investments:
Fixed maturity securities at fair value (amortized cost $2,450.2 at June 30, 2019 and $2,513.7 at December 31, 2018)	$ 2,517,700	$ 2,496,400
Equity securities at fair value (cost $143.1 at June 30, 2019 and $131.9 at December 31, 2018)	239,100	199,900
Equity securities at cost	6,700	6,400
Other invested assets	2,000	0
Short-term investments at fair value (amortized cost $25.0 at December 31, 2018)	0	25,000
Total investments	2,765,500	2,727,700
Cash and cash equivalents	105,500	101,400
Restricted cash and cash equivalents	300	600
Accrued investment income	16,900	18,000
Premiums receivable (less bad debt allowance of $6.6 at June 30, 2019 and $6.7 at December 31, 2018)	342,700	333,100
Reinsurance recoverable for:
Paid losses	6,500	6,700
Unpaid losses	484,200	504,400
Deferred policy acquisition costs	52,300	48,200
Deferred income taxes, net	2,200	26,900
Property and equipment, net	22,800	18,200
Operating lease right-of-use assets	15,700	0
Intangible assets, net	7,700	7,700
Goodwill	36,200	36,200
Contingent commission receivable—LPT Agreement	32,200	32,000
Cloud computing arrangements	29,500	26,000
Other assets	34,100	32,100
Total assets	3,954,300	3,919,200
Liabilities and stockholders’ equity
Unpaid losses and loss adjustment expenses	2,161,800	2,207,900
Unearned premiums	370,100	336,300
Commissions and premium taxes payable	55,000	57,300
Accounts payable and accrued expenses	23,400	37,100
Deferred reinsurance gain—LPT Agreement	141,700	149,600
Notes payable	0	20,000
Operating lease liability	17,800	0
Non-cancellable obligations	20,200	18,800
Other liabilities	42,800	74,000
Total liabilities	2,832,800	2,901,000
Stockholders’ equity:
Common stock, $0.01 par value; 150,000,000 shares authorized; 57,157,926 and 56,975,675 shares issued and 31,904,916 and 32,765,792 shares outstanding at June 30, 2019 and December 31, 2018, respectively	600	600
Preferred stock, $0.01 par value; 25,000,000 shares authorized; none issued	0	0
Additional paid-in capital	389,800	388,800
Retained earnings	1,108,700	1,030,700
Accumulated other comprehensive income (loss), net of tax	53,300	(13,700)
Treasury stock, at cost (25,253,010 shares at June 30, 2019 and 24,209,883 shares at December 31, 2018)	(430,900)	(388,200)
Total stockholders’ equity	1,121,500	1,018,200
Total liabilities and stockholders’ equity	$ 3,954,300	$ 3,919,200

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Consolidated Statements of Income - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Net premiums earned	$ 175,500	$ 178,000	$ 350,300	$ 354,600
Net investment income	21,400	20,300	43,200	39,700
Net realized and unrealized (losses) gains on investments	7,400	5,700	30,700	(2,400)
Other income	0	100	400	100
Total revenues	204,300	204,100	424,600	392,000
Expenses
Losses and loss adjustment expenses	86,800	87,800	175,300	183,200
Commission expense	23,800	24,500	45,800	48,200
Underwriting and other operating expenses	43,800	40,100	91,300	79,200
Interest and financing expenses	200	400	600	700
Total expenses	154,600	152,800	313,000	311,300
Net income before income taxes	49,700	51,300	111,600	80,700
Income tax expense	9,000	8,800	19,000	12,600
Net income	40,700	42,500	92,600	68,100
Comprehensive income
Unrealized AFS investment gains (losses) arising during the period (net of tax (expense) benefit of $(8.0) and $3.0 for the three months ended June 30, 2019 and 2018, respectively, and $(18.0) and $12.6 for the six months ended June 30, 2019 and 2018, respectively)	29,900	(11,300)	67,700	(47,100)
Reclassification adjustment for realized AFS investment (gains) losses in net income (net of tax (expense) benefit of $0.1 for the three months ended June 30, 2019, and $0.2 and $(0.1) for the six months ended June 30, 2019 and 2018, respectively)	(200)	0	(700)	400
Other comprehensive income (loss), net of tax	29,700	(11,300)	67,000	(46,700)
Total comprehensive income	70,400	31,200	159,600	21,400
Net realized and unrealized gains (losses) on investments
Net realized and unrealized gains (losses) on investments before impairments	7,400	5,700	30,700	(400)
Other than temporary impairment recognized in earnings	0	0	0	(2,000)
Net realized and unrealized (losses) gains on investments	$ 7,400	$ 5,700	$ 30,700	$ (2,400)
Earnings per common share (Note 13):
Basic	$ 1.27	$ 1.29	$ 2.88	$ 2.07
Diluted	1.25	1.28	2.84	2.05
Cash dividends declared per common share and eligible RSUs and PSUs	$ 0.22	$ 0.20	$ 0.44	$ 0.40

Consolidated Balance Sheets Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available for sale:
Debt securities, available-for-sale, amortized cost	$ 2,450,200	$ 2,513,700
Equity Securities, FV-NI, Cost	143,100	131,900
Available for sale, short-term investments, at amortized cost	0	25,000
Premiums receivable, bad debt allowance	6,600	6,700
Reinsurance recoverables on unpaid losses, allowance	$ 0	$ 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)	57,157,926	56,975,675
Common stock, shares outstanding (in shares)	31,904,916	32,765,792
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)	25,253,010	24,209,883

Consolidated Statements of Stockholders Equity Statement - USD ($)	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income, Net	Treasury Stock [Member]
Stockholders' equity, shares at Dec. 31, 2017		56,695,174
Stockholders' equity, value at Dec. 31, 2017	$ 947,700,000	$ 600,000	$ 381,200,000	$ 842,200,000	$ 107,400,000	$ (383,700,000)
Stock-based obligations, shares		0
Stock-based obligations, value	$ 3,900,000	$ 0	3,900,000	0	0	0
Stock-options exercised, shares	13,800	13,800
Stock-options exercised, value	$ 200,000	$ 0	200,000	0	0	0
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, shares		157,753
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, value	(2,900,000)	$ 0	(2,900,000)	0	0	0
Acquisition of common stock, shares		0
Acquisition of common stock, value	(300,000)	$ 0	0		0	(300,000)
Dividends declared, shares		0
Dividends declared, value	(13,300,000)	$ 0	0	(13,300,000)	0	0
Net income	68,100,000	0	0	68,100,000	0	0
Change in net unrealized gains in investments, net of tax	(46,700,000)	$ 0	0	0	(46,700,000)	0
Stockholders' equity, shares at Jun. 30, 2018		56,866,727
Stockholders' equity, value at Jun. 30, 2018	956,500,000	$ 600,000	382,400,000	970,800,000	(13,300,000)	(384,000,000.0)
Stockholders' equity, shares at Dec. 31, 2017		56,695,174
Stockholders' equity, value at Dec. 31, 2017	$ 947,700,000	$ 600,000	381,200,000	842,200,000	107,400,000	(383,700,000)
Stock-options exercised, shares	57,091
Stockholders' equity, shares at Dec. 31, 2018	56,975,675	56,975,675
Stockholders' equity, value at Dec. 31, 2018	$ 1,018,200,000	$ 600,000	388,800,000	1,030,700,000	(13,700,000)	(388,200,000)
Stockholders' equity, shares at Mar. 31, 2018		56,849,494
Stockholders' equity, value at Mar. 31, 2018	930,300,000	$ 600,000	380,400,000	935,000,000.0	(2,000,000.0)	(383,700,000)
Stock-based obligations, shares		0
Stock-based obligations, value	1,800,000	$ 0	1,800,000	0	0	0
Stock-options exercised, shares		13,525
Stock-options exercised, value	200,000	$ 0	200,000	0	0	0
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, shares		3,708
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, value	0	$ 0	0	0	0	0
Acquisition of common stock, shares		0
Acquisition of common stock, value	(300,000)	$ 0	0	0	0	(300,000)
Dividends declared, shares		0
Dividends declared, value	(6,700,000)	$ 0	0	(6,700,000)	0	0
Net income	42,500,000	0	0	42,500,000	0	0
Change in net unrealized gains in investments, net of tax	(11,300,000)	$ 0	0	0	(11,300,000)	0
Stockholders' equity, shares at Jun. 30, 2018		56,866,727
Stockholders' equity, value at Jun. 30, 2018	956,500,000	$ 600,000	382,400,000	970,800,000	(13,300,000)	(384,000,000.0)
Reclassification adjustment for adoption of ASU	$ 0	$ 0	0	74,000,000.0	(74,000,000.0)	0
Stockholders' equity, shares at Dec. 31, 2018	56,975,675	56,975,675
Stockholders' equity, value at Dec. 31, 2018	$ 1,018,200,000	$ 600,000	388,800,000	1,030,700,000	(13,700,000)	(388,200,000)
Stock-based obligations, shares		0
Stock-based obligations, value	$ 4,100,000	$ 0	4,100,000	0	0	0
Stock-options exercised, shares	5,186	5,186
Stock-options exercised, value	$ 100,000	$ 0	100,000	0	0	0
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, shares		177,065
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, value	(3,200,000)	$ 0	(3,200,000)	0	0	0
Acquisition of common stock, shares		0
Acquisition of common stock, value	(42,700,000)	$ 0	0	0	0	(42,700,000)
Dividends declared, shares		0
Dividends declared, value	(14,600,000)	$ 0	0	(14,600,000)	0	0
Net income	92,600,000	0	0	92,600,000	0	0
Change in net unrealized gains in investments, net of tax	$ 67,000,000.0	$ 0	0	0	67,000,000.0	0
Stockholders' equity, shares at Jun. 30, 2019	57,157,926	57,157,926
Stockholders' equity, value at Jun. 30, 2019	$ 1,121,500,000	$ 600,000	389,800,000	1,108,700,000	53,300,000	(430,900,000)
Stockholders' equity, shares at Mar. 31, 2019		57,144,530
Stockholders' equity, value at Mar. 31, 2019	1,071,700,000	$ 600,000	388,100,000	1,075,100,000	23,600,000	(415,700,000)
Stock-based obligations, shares		0
Stock-based obligations, value	1,600,000	$ 0	1,600,000	0	0	0
Stock-options exercised, shares		3,886
Stock-options exercised, value	100,000	$ 0	100,000	0	0	0
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, shares		9,510
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, value	0	$ 0	0	0	0	0
Acquisition of common stock, shares		0
Acquisition of common stock, value	(15,200,000)	$ 0	0	0	0	(15,200,000)
Dividends declared, shares		0
Dividends declared, value	(7,100,000)	$ 0	0	(7,100,000)	0	0
Net income	40,700,000	0	0	40,700,000	0	0
Change in net unrealized gains in investments, net of tax	$ 29,700,000	$ 0	0	0	29,700,000	0
Stockholders' equity, shares at Jun. 30, 2019	57,157,926	57,157,926
Stockholders' equity, value at Jun. 30, 2019	$ 1,121,500,000	$ 600,000	$ 389,800,000	$ 1,108,700,000	$ 53,300,000	$ (430,900,000)

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Jun. 30, 2019	Dec. 31, 2018
Operating activities
Net income	$ 40,700	$ 42,500	$ 92,600	$ 68,100
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			3,700	3,800
Stock-based compensation			4,100	3,800
Amortization of cloud computing arrangements	1,100		2,100	0	$ 800
Amortization of premium on investments, net			4,200	4,400
Allowance for doubtful accounts			(100)	(2,500)
Deferred income tax expense			6,900	16,800
Net realized and unrealized (gains) losses on investments			(30,700)	2,400
Change in operating assets and liabilities:
Premiums receivable			(9,500)	(26,500)
Reinsurance recoverable on paid and unpaid losses			20,400	24,100
Cloud computing arrangements			(5,600)	0
Operating lease right-of-use-assets			(15,700)	0
Current federal income taxes			(9,500)	(7,100)
Unpaid losses and loss adjustment expenses			46,100	38,200
Unearned premiums			33,800	41,900
Accounts payable, accrued expenses and other liabilities			(12,900)	4,000
Deferred reinsurance gain—LPT Agreement			(7,900)	(8,900)
Operating lease liabilities			17,800	0
Non-cancellable obligations			1,400	0
Other			(6,700)	100
Net cash provided by operating activities			42,300	86,200
Investing activities
Purchases of fixed maturity securities			(173,800)	(358,100)
Purchases of equity securities			(34,400)	(19,900)
Purchases of short-term investments			0	(34,900)
Purchases of other invested assets			(2,000)	0
Proceeds from sale of fixed maturity securities			94,300	168,400
Proceeds from sale of equity securities			14,700	24,000
Proceeds from maturities and redemptions of fixed maturity securities			149,700	187,700
Proceeds from maturities of short-term investments			25,000	38,900
Net change in unsettled investment purchases and sales			(22,700)	7,200
Capital expenditures and other			(8,300)	(10,100)
Net cash provided by investing activities			42,500	3,200
Financing activities
Acquisition of common stock			(43,100)	(300)
Cash transactions related to stock-based compensation			(3,100)	(2,700)
Dividends paid to stockholders			(14,700)	(13,300)
Redemption of notes payable			(20,000)	0
Payments on capital leases			100	100
Net cash used in financing activities			(81,000)	(16,400)
Net increase in cash, cash equivalents and restricted cash			3,800	73,000
Cash, cash equivalents, restricted cash and restricted cash equivalents at the beginning of the period			102,000	74,300	74,300
Cash, cash equivalents, restricted cash and restricted cash equivalents at the end of the period	105,800	147,300	105,800	147,300	102,000
Cash and cash equivalents						$ 105,500	$ 101,400
Restricted cash and cash equivalents						300	600
Total cash, cash equivalents, restricted cash	$ 105,800	$ 147,300	$ 105,800	$ 74,300	$ 74,300	$ 105,800	$ 102,000

Basis of Presentation	6 Months Ended
Basis of Presentation	Jun. 30, 2019
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), and Employers Assurance Company (EAC), 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 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, 2018 (Annual Report). The Company operates as a single operating segment, workers' compensation insurance, through its wholly owned subsidiaries. The Company considers an operating segment to be any component of its business whose operating results are regularly reviewed by the Company’s chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance based on discrete financial information. 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. Pending Acquisition On August 11, 2017, the Company entered into a stock purchase agreement (Purchase Agreement), as most recently amended on October 25, 2018, with Partner Reinsurance Company of the U.S. (PRUS) with respect to the acquisition (Acquisition) of all of the outstanding shares of capital stock of PartnerRe Insurance Company of New York (PRNY). The purchase price is equal to the sum of: (i) the amount of statutory capital and surplus of PRNY at closing (which is currently estimated to be approximately $47.0 million); and (ii) $5.8 million. The Company expects to fund the Acquisition with cash on hand. Pursuant to the Purchase Agreement, all liabilities and obligations of PRNY existing as of the closing date, whether known or unknown, will be indemnified by PRUS. In addition, PartnerRe Ltd., the parent company of PRUS, has provided the Company with a guaranty that unconditionally, absolutely and irrevocably guarantees the full and prompt payment and performance by PRUS of all of its obligations, liabilities, and indemnities under the Purchase Agreement and the transactions contemplated thereby. The Company will not be acquiring any employees or ongoing business operations pursuant to the Acquisition. The Acquisition is subject to certain closing conditions, including, among other things, approval from the Department of Financial Services of the State of New York, which occurred in June 2019. The Company expects to close the Acquisition on July 31, 2019.

New Accounting Standards Level 1 (Notes)	6 Months Ended
New Accounting Standards Level 1 (Notes)	Jun. 30, 2019
New Accounting Standards [Abstract]
New Accounting Standards	New Accounting Standards Recently Issued Accounting Standards In April 2019, the Financial Accounting Standards Board (FASB) issued Accounting Standards Updated (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 will adopt the updates related to Topic 815 when it adopts ASU 2016-13. The Company will adopt any remaining codification improvements as they become applicable and has determined that the impact of these improvements will not be material to its consolidated financial condition and results of operations. In August 2018, the 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. This update becomes effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company does not expect that this update will have a material impact on its consolidated financial condition and results of operations. In January 2017, the 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. This update becomes effective for fiscal years beginning after December 15, 2019. The Company does not expect that this update will have a material impact on its consolidated financial condition and results of operations. In June 2016, the 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 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 becomes effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Additionally, in December 2018, the 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, the 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. The Company is currently evaluating the impact that the adoption of these updates will have on its consolidated financial condition and results of operations. Recently Adopted Accounting Standards In July 2018, the FASB issued ASU 2018-09, Codification Improvements. This update provides clarification, corrects errors in and makes minor improvements to the Codification within various ASC topics. Many of the amendments in this update have transition guidance with effective dates for annual periods beginning after December 15, 2018 and some amendments in this update do not require transition guidance and became effective upon issuance of this update. The Company has adopted these amendments and has determined that there was no impact to its consolidated financial condition and results of operations. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements. This update provides entities with an additional and optional transition method to adopt ASU 2016-02 with a cumulative-effect adjustment in the period of adoption. This update also provides guidance for a practical expedient that permits lessors to not separate non-lease components from the associated lease components. Additionally, in July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842, Leases. This update provides additional guidance on the new lease model with improvements in numerous aspects of the guidance in ASC 842 including, but not limited to, implicit rates, reassessment of lease classification, terms and purchase options, investment tax credits, and various other transition guidance. In December 2018, the FASB issued ASU 2018-20, Leases (Topic 842): Narrow-Scope Improvements for Lessors. This update provides amendments to various lease topics including sales taxes collected from lessees, certain lessor costs paid to third parties, and variable payments for contracts with lease and non-lease components. In March 2019, the FASB issued ASU 2019-01, Leases Topics (842) Codification Improvements. The amendments in this update increase transparency and comparability for the recognition of leases and disclosures about leasing transactions. This update provides additional clarity on determining the value of the underlying asset by lessors that are not manufacturers or dealers. This update further clarifies the presentation of the statement of cash flows related to lessors that are depository and lending institutions within the scope of Topic 942. Additionally, this update provides guidance on transition disclosures related to leases. The Company adopted these updates concurrently with ASU 2016-02. See Note 6 regarding the impact of adopting this standard on the Company's Consolidated Financial Statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). This update provides guidance on a new lease model that includes the recognition of assets and liabilities arising from lease transactions on the balance sheet. Additionally, the update provides clarity on the definition of a lease and the distinction between finance and operating leases. Furthermore, the update requires certain qualitative and quantitative disclosures pertaining to the amounts recorded in the financial statements. This update became effective for annual reporting periods, including interim periods within those annual periods, beginning after December 15, 2018 and early adoption is permitted. As a result of the implementation of this standard, the Company recognized an Operating lease right-of-use asset of $16.8 million and $19.0 million of Lease liabilities on its Consolidated Balance Sheet at March 31, 2019. See Note 6 for additional detail regarding the adoption of this standard.

Valuation of Financial Instruments

6 Months Ended

Jun. 30, 2019

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:



	June 30, 2019				December 31, 2018
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
	(in millions)
Financial assets
Total investments at fair value	$	2,756.8	$	2,756.8	$	2,721.3	$	2,721.3
Cash and cash equivalents	105.5		105.5		101.4		101.4
Restricted cash and cash equivalents	0.3		0.3		0.6		0.6
Financial liabilities
Notes payable	$	—	$	—	$	20.0	$	23.5

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 June 30, 2019 and December 31, 2018.

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 Company's estimates of fair value for its notes payable are based on a combination of the variable interest rates for notes with similar durations to discount the projection of future payments on notes payable. The fair value measurements for notes payable have been determined to be Level 2 at December 31, 2018. As of June 30, 2019, all outstanding notes payable were redeemed. See Note 10 for further details.

Each of the Company's insurance operating subsidiaries is a member 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 following table presents the Company's investments at fair value and the corresponding fair value measurements.



	June 30, 2019						December 31, 2018
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
	(in millions)
Fixed maturity securities:
U.S. Treasuries	$	—	$	94.9	$	—	$	—	$	106.4	$	—
U.S. Agencies	—		9.9		—		—		11.4		—
States and municipalities	—		505.4		—		—		528.0		—
Corporate securities	—		1,098.5		—		—		1,090.4		—
Residential mortgage-backed securities	—		463.0		—		—		451.5		—
Commercial mortgage-backed securities	—		103.7		—		—		94.3		—
Asset-backed securities	—		65.4		—		—		64.5		—
Other securities	—		176.9		—		—		149.9		—
Total fixed maturity securities	$	—	$	2,517.7	$	—	$	—	$	2,496.4	$	—
Equity securities at fair value:
Industrial and miscellaneous	$	211.1	$	—	$	—	$	174.8	$	—	$	—
Other	28.0		—		—		25.1		—		—
Total equity securities at fair value	$	239.1	$	—	$	—	$	199.9	$	—	$	—
Short-term investments	$	—	$	—	$	—	$	—	$	25.0	$	—
Total investments at fair value	$	239.1	$	2,517.7	$	—	$	199.9	$	2,521.4	$	—

The following table provides a reconciliation of the beginning and ending balances of investments that are recorded at fair value and are measured using Level 3 inputs for the six months ended June 30, 2019 and 2018.



	Six Months Ended
	June 30, 2019		June 30, 2018
Level 3 Securities:	(in millions)
Beginning balance, January 1	$	—	$	4.7
Transfers out of Level 3 ⁽¹⁾	—		(4.7		)
Purchases and sales, net	—		—
Ending balance, June 30	$	—	$	—


(1)	The transfer during the six months ended June 30, 2018 was the result of adoption of ASU 2016-01, which specified that FHLB stock shall be carried at cost and is therefore excluded from the fair value hierarchy.

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, use NAV and 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 the 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 thererof. The Company expects these distributions from time-to-time during the full course of the fund term. As of June 30, 2019, the Company had unfunded commitments to these private equity limited partnerships totaling $48.0 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.



	June 30, 2019		December 31, 2018
	(in millions)
Cash equivalents carried at NAV	$	68.4	$	57.5
Other invested assets carried at NAV	2.0		—

- 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

6 Months Ended

Jun. 30, 2019

Investments [Abstract]

Investments

The Company's investments in fixed maturity securities and short-term investments are classified as available-for-sale (AFS) and are reported at fair value with unrealized gains and losses excluded from earnings and reported as a separate component of stockholders' equity, net of deferred taxes, in Accumulated other comprehensive income (loss) (AOCI) on the Company’s Consolidated Balance Sheets. Other securities within fixed maturity securities consist of bank loans, which are classified as AFS and are reported at fair value.

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the Company’s AFS investments were as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(in millions)
At June 30, 2019
Fixed maturity securities
U.S. Treasuries	$	93.1	$	1.9	$	(0.1	)	$	94.9
U.S. Agencies	9.7		0.2		—			9.9
States and municipalities	478.8		26.6		—			505.4
Corporate securities	1,066.6		32.3		(0.4		)	1,098.5
Residential mortgage-backed securities	459.2		5.8		(2.0		)	463.0
Commercial mortgage-backed securities	100.9		2.8		—			103.7
Asset-backed securities	64.4		1.0		—			65.4
Other securities	177.5		0.5		(1.1		)	176.9
Total fixed maturity securities	$	2,450.2	71.1		(3.6		)	$	2,517.7



At December 31, 2018
Fixed maturity securities
U.S. Treasuries	$	106.7	$	0.9	$	(1.2	)	$	106.4
U.S. Agencies	11.3		0.1		—			11.4
States and municipalities	513.4		15.3		(0.7		)	528.0
Corporate securities	1,106.2		5.8		(21.6		)	1,090.4
Residential mortgage-backed securities	459.1		2.2		(9.8		)	451.5
Commercial mortgage-backed securities	96.7		0.1		(2.5		)	94.3
Asset-backed securities	64.7		0.2		(0.4		)	64.5
Other securities	155.6		—		(5.7		)	149.9
Total fixed maturity securities	$	2,513.7	24.6		(41.9		)	$	2,496.4
Total short-term investments	$	25.0	—		—			$	25.0

The Company's investment in equity securities are recorded at fair value with changes in the fair value included in Net realized and unrealized gains (losses) on investments on the Company's Consolidated Statements of Comprehensive Income. The Company's investment in FHLB stock is presented within Equity securities at cost on the Company's Consolidated Balance Sheets. The cost and estimated fair value of the Company’s equity securities recorded at fair value at June 30, 2019 and December 31, 2018 were as follows:



	Cost		Estimated Fair Value
	(in millions)
At June 30, 2019
Equity securities at fair value
Industrial and miscellaneous	$	126.3	$	211.1
Other	16.8		28.0
Total equity securities at fair value	$	143.1	$	239.1



At December 31, 2018
Equity securities at fair value
Industrial and miscellaneous	$	114.6	$	174.8
Other	17.3		25.1
Total equity securities at fair value	$	131.9	$	199.9

The Company also invests in private equity limited partnerships, which are included in Other invested assets on the Company's Consolidated Balance Sheets. These investments are carried at NAV based on information provided by the general partner. 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 following table shows the cost and net asset value of the Company's Other invested assets at June 30, 2019. The Company had no Other invested assets at December 31, 2018.



	Cost		Net Asset Value
	(in millions)
At June 30, 2019
Other invested assets
Private equity fund investments	$	2.0	$	2.0
Total other invested assets	$	2.0	$	2.0

The amortized cost and estimated fair value of the Company's fixed maturity securities at June 30, 2019, 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	$	145.9	$	146.8
Due after one year through five years	835.5		855.6
Due after five years through ten years	789.1		823.2
Due after ten years	55.2		60.0
Mortgage and asset-backed securities	624.5		632.1
Total	$	2,450.2	$	2,517.7

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 June 30, 2019 and December 31, 2018.



	June 30, 2019						December 31, 2018
	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
U.S. Treasuries	$	—	$	—		—	$	12.2	$	(0.1	)	7
States and municipalities	—		—			—	70.1		(0.7		)	21
Corporate securities	—		—			—	624.4		(13.4		)	205
Residential mortgage-backed securities	—		—			—	156.9		(2.5		)	59
Commercial mortgage-backed securities	—		—			—	30.9		(0.5		)	13
Asset-backed securities	—		—			—	25.1		(0.2		)	18
Other securities	111.6		(1.1		)	218	137.1		(5.7		)	215
Total less than 12 months	$	111.6	$	(1.1	)	218	$	1,056.7	$	(23.1	)	538

12 months or greater:
Fixed maturity securities
U.S. Treasuries	$	22.8	$	(0.1	)	11	$	72.7	$	(1.1	)	25
Corporate securities	41.4		(0.4		)	19	193.7		(8.2		)	69
Residential mortgage-backed securities	143.4		(2.0		)	58	199.8		(7.3		)	72
Commercial mortgage-backed securities	—		—			—	55.0		(2.0		)	22
Asset-backed securities	—		—			—	16.5		(0.2		)	17
Total 12 months or greater	$	207.6	$	(2.5	)	88	$	537.7	$	(18.8	)	205

There were no other-than-temporary impairments on fixed maturity securities recognized during the six months ended June 30, 2019. The Company recognized impairments on fixed maturity securities of $2.0 million (consisting of fifty-seven securities) during the six months ended June 30, 2018 as a result of the Company's intent to sell these securities. The Company determined that the remaining unrealized losses on fixed maturity securities for the six months ended June 30, 2018 were primarily the result of changes in prevailing interest rates and not the credit quality of the issuers. The fixed maturity securities whose total fair value was less than amortized cost were not determined to be other-than-temporarily impaired given the lack of severity and duration of the impairment, the credit quality of the issuers, the Company’s intent to not sell the securities, and a determination that it is not more likely than not that the Company will be required to sell the securities 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.

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 June 30, 2019
Fixed maturity securities	$	0.6	$	(0.3	)	$	37.6	$	0.3	$	37.6
Equity securities	1.1		(0.8		)	6.8		7.1		—
Total investments	$	1.7	$	(1.1	)	$	44.4	$	7.4	$	37.6

Six Months Ended June 30, 2019
Fixed maturity securities	$	1.6	$	(0.7	)	$	84.8	$	0.9	$	84.8
Equity securities	2.7		(0.9		)	28.0		29.8		—
Total investments	$	4.3	$	(1.6	)	$	112.8	$	30.7	$	84.8



Three Months Ended June 30, 2018
Fixed maturity securities	$	0.3	$	(0.3	)	$	(14.3	)	$	—		$	(14.3	)
Equity securities	2.6		(0.4		)	3.5			5.7			—
Total investments	$	2.9	$	(0.7	)	$	(10.8	)	$	5.7		$	(14.3	)

Six Months Ended June 30, 2018
Fixed maturity securities	$	2.1	$	(2.6	)	$	(59.2	)	$	(0.5	)	$	(59.2	)
Equity securities	8.1		(0.6		)	(9.4		)	(1.9		)	—
Total investments	$	10.2	$	(3.2	)	$	(68.6	)	$	(2.4	)	$	(59.2	)

Net investment income was as follows:



	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019			2018			2019			2018
	(in millions)
Fixed maturity securities	$	20.2		$	19.2		$	40.6		$	37.7
Equity securities	1.9			1.7			3.8			3.3
Cash equivalents and restricted cash	0.5			0.3			1.0			0.5
Gross investment income	22.6			21.2			45.4			41.5
Investment expenses	(1.2		)	(0.9		)	(2.2		)	(1.8		)
Net investment income	$	21.4		$	20.3		$	43.2		$	39.7

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 June 30, 2019 and December 31, 2018, securities having a fair value of $902.2 million and $867.7 million, respectively, were on deposit. Additionally, standby letters of credit from the FHLB were in place in lieu of $260.0 million of securities on deposit as of June 30, 2019 (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 June 30, 2019 and December 31, 2018 was $3.2 million and $23.2 million, respectively.

Property and Equipment Level 1 (Notes)

6 Months Ended

Jun. 30, 2019

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure [Text Block]

Property and Equipment

Property and equipment consists of the following:



	As of June 30,			As of December 31,
	2019			2018
	(in millions)
Furniture and equipment	$	2.5		$	3.3
Leasehold improvements	5.7			3.2
Computers and software	67.4			61.9
Automobiles	1.1			1.1
Property and equipment, gross	76.7			69.5
Accumulated depreciation	(53.9		)	(51.3		)
Property and equipment, net	$	22.8		$	18.2

Depreciation expenses related to property and equipment for the three and six months ended June 30, 2019 were $2.6 million and $3.7 million, respectively, and $6.1 million for the year ended December 31, 2018. Internally developed software costs of $0.8 million and $1.6 million were capitalized during the three and six months ended June 30, 2019, respectively, and $2.9 million in internally developed software costs were capitalized during the year ended December 31, 2018.

Cloud Computing Arrangements

The Company's capitalized costs associated with cloud computing arrangements totaled $29.5 million and $26.0 million, which was comprised of service contract fees and implementation costs associated with hosting arrangements on the Company's Consolidated Balance Sheets as of June 30, 2019 and December 31, 2018, respectively. Total amortization for hosting arrangements for the three and six months ended June 30, 2019 was $1.1 million and $2.1 million, respectively, and $0.8 million for the year ended December 31, 2018.

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. The Company elected the practical expedients provided in ASU Number 2018-11, Leases (Topic 842): Targeted Improvements and ASU Number 2016-02, Leases (Topic 842), allowing the Company to apply provisions of the new guidance at the date of adoption without adjusting comparative periods presented.

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 8 years, which have 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		Six Months Ended
	June 30, 2019		June 30, 2019
	(in millions)
Operating lease expense	$	1.2	$	2.5
Finance lease expense	0.1		0.1
Total lease expense	$	1.3	$	2.6

As of June 30, 2019, the weighted average remaining lease term for operating leases was 6.0 years and for finance leases was 3.1 years. The weighted average discount rate was 3.3% and 3.7% for operating and finance leases, respectively.

Maturities of lease liabilities were as follows:



	As of June 30, 2019
	Operating Leases			Finance Leases
	(in millions)
2019	$	2.6		$	0.2
2020	4.4			0.2
2021	2.9			0.2
2022	1.9			—
2023	1.8			—
Thereafter	6.2			—
Total lease payments	19.8			0.6
Less: inputed interest	(2.0		)	—
Total	$	17.8		$	0.6

Supplemental balance sheet information related to leases was as follows:



	As of June 30, 2019
	(in millions)
Operating leases:
Operating lease right-of-use asset	$	15.7
Operating lease liability	17.8
Finance leases:
Property and equipment, gross	1.1
Accumulated depreciation	(0.5		)
Property and equipment, net	0.6
Other liabilities	$	0.6

Supplemental cash flow information related to leases was as follows:



	Six Months Ended
	June 30, 2019
	(in millions)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	2.5
Financing cash flows from finance leases	0.1

Liability for Unpaid Losses and Loss Adjustment Expenses

6 Months Ended

Jun. 30, 2019

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						Six Months Ended
	June 30,						June 30,
	2019			2018			2019			2018
	(in millions)
Unpaid losses and LAE at beginning of period	$	2,189.3		$	2,258.1		$	2,207.9		$	2,266.1
Less reinsurance recoverable, excluding bad debt allowance, on unpaid losses and LAE	498.7			531.1			504.4			537.0
Net unpaid losses and LAE at beginning of period	1,690.6			1,727.0			1,703.5			1,729.1
Losses and LAE, net of reinsurance, incurred during the period related to:
Current period	116.1			111.2			229.4			221.6
Prior periods	(23.7		)	(16.5		)	(45.9		)	(28.9		)
Total net losses and LAE incurred during the period	92.4			94.7			183.5			192.7
Paid losses and LAE, net of reinsurance, related to:
Current period	23.2			20.0			30.6			25.9
Prior periods	82.2			86.3			178.8			180.5
Total net paid losses and LAE during the period	105.4			106.3			209.4			206.4
Ending unpaid losses and LAE, net of reinsurance	1,677.6			1,715.4			1,677.6			1,715.4
Reinsurance recoverable, excluding bad debt allowance, on unpaid losses and LAE	484.2			512.5			484.2			512.5
Unpaid losses and LAE at end of period	$	2,161.8		$	2,227.9		$	2,161.8		$	2,227.9

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 $5.7 million and $6.9 million for the three months ended June 30, 2019 and 2018, respectively and $8.2 million and $9.5 million for the six months ended June 30, 2019 and 2018, respectively (See Note 9).

The change in incurred losses and LAE attributable to prior periods included $24.0 million and $46.0 million of favorable development on the Company's voluntary risk business for the three and six months ended June 30, 2019, respectively, and $0.3 million and $0.1 million of unfavorable development on the Company's assigned risk business for the same periods. The change in incurred losses and LAE attributable to prior periods for the three and six months ended June 30, 2018 included $16.5 million and $28.5 million of favorable development on the Company's voluntary risk business, respectively, and $0.4 million of favorable development on the Company's assigned risk business for the six months ended June 30, 2018. The favorable prior accident year loss development on voluntary business during the three and six months ended June 30, 2019 and 2018 was the result of the Company's determination that adjustments were necessary to reflect observed favorable paid loss trends, which have been impacted by cost savings associated with accelerated claims settlement activity that began in 2014 and continued in 2019.

Notes Payable Level 1 (Notes)

6 Months Ended

Jun. 30, 2019

Notes Payable [Abstract]

Debt Disclosure [Text Block]

Notes Payable and Other Financing Arrangements

Notes payable is comprised of the following:



	June 30, 2019		December 31, 2018
	(in millions)
Dekania Surplus Note, due April 29, 2034	$	—	$	10.0
Alesco Surplus Note, due December 15, 2034	—		10.0
Total	$	—	$	20.0

EPIC had a $10.0 million surplus note to Dekania CDO II, Ltd. (Dekania) issued as part of a pooled transaction. On April 12, 2019, the Florida Office of Insurance Regulation approved EPIC's request to pay off the Dekania surplus note. Subsequently, on April 15, 2019, EPIC formally called this note. The outstanding principal, plus accrued and unpaid interest, in the amount of $10.2 million, was paid on May 14, 2019.

EPIC had a $10.0 million surplus note to Alesco Preferred Funding V, LTD (Alesco) issued as part of a pooled transaction. On April 12, 2019, the Florida Office of Insurance Regulation approved EPIC's request to pay off the Alesco surplus note. Subsequently, on May 6, 2019, EPIC formally called this note. The outstanding principal, plus accrued and unpaid interest, in the amount of $10.2 million, was paid on June 13, 2019.

Other financing arrangements are comprised of the following:

Each of the Company's insurance subsidiaries is a member 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, EPIC, and EAC 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 $60.0 million, ECIC, in the amount of $90.0 million, and EPIC, in the amount of $110.0 million. The amended Letter of Credit Agreements will expire on March 31, 2020; however, the Letter of Credit Agreements 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 June 30, 2019, letters of credit totaling $260.0 million were issued in lieu of securities on deposit with the State of California under these Letter of Credit Agreements.

As of June 30, 2019, investment securities having a fair value of $356.8 million were pledged to the FHLB by the Company's insurance subsidiaries in support of the collateralized advance facility and the Letter of Credit Agreements.

Valuation of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2019

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:



	June 30, 2019				December 31, 2018
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
	(in millions)
Financial assets
Total investments at fair value	$	2,756.8	$	2,756.8	$	2,721.3	$	2,721.3
Cash and cash equivalents	105.5		105.5		101.4		101.4
Restricted cash and cash equivalents	0.3		0.3		0.6		0.6
Financial liabilities
Notes payable	$	—	$	—	$	20.0	$	23.5

Fair value, assets measured on recurring basis, unobservable input reconciliation table



	Six Months Ended
	June 30, 2019		June 30, 2018
Level 3 Securities:	(in millions)
Beginning balance, January 1	$	—	$	4.7
Transfers out of Level 3 ⁽¹⁾	—		(4.7		)
Purchases and sales, net	—		—
Ending balance, June 30	$	—	$	—


(1)	The transfer during the six months ended June 30, 2018 was the result of adoption of ASU 2016-01, which specified that FHLB stock shall be carried at cost and is therefore excluded from the fair value hierarchy.

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.



	June 30, 2019		December 31, 2018
	(in millions)
Cash equivalents carried at NAV	$	68.4	$	57.5
Other invested assets carried at NAV	2.0		—

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.



	June 30, 2019						December 31, 2018
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
	(in millions)
Fixed maturity securities:
U.S. Treasuries	$	—	$	94.9	$	—	$	—	$	106.4	$	—
U.S. Agencies	—		9.9		—		—		11.4		—
States and municipalities	—		505.4		—		—		528.0		—
Corporate securities	—		1,098.5		—		—		1,090.4		—
Residential mortgage-backed securities	—		463.0		—		—		451.5		—
Commercial mortgage-backed securities	—		103.7		—		—		94.3		—
Asset-backed securities	—		65.4		—		—		64.5		—
Other securities	—		176.9		—		—		149.9		—
Total fixed maturity securities	$	—	$	2,517.7	$	—	$	—	$	2,496.4	$	—
Equity securities at fair value:
Industrial and miscellaneous	$	211.1	$	—	$	—	$	174.8	$	—	$	—
Other	28.0		—		—		25.1		—		—
Total equity securities at fair value	$	239.1	$	—	$	—	$	199.9	$	—	$	—
Short-term investments	$	—	$	—	$	—	$	—	$	25.0	$	—
Total investments at fair value	$	239.1	$	2,517.7	$	—	$	199.9	$	2,521.4	$	—

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

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



	June 30, 2019		December 31, 2018
	(in millions)
Cash equivalents carried at NAV	$	68.4	$	57.5
Other invested assets carried at NAV	2.0		—

- 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)

6 Months Ended

Jun. 30, 2019

Investments [Abstract]

Available-for-sale securities table

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the Company’s AFS investments were as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(in millions)
At June 30, 2019
Fixed maturity securities
U.S. Treasuries	$	93.1	$	1.9	$	(0.1	)	$	94.9
U.S. Agencies	9.7		0.2		—			9.9
States and municipalities	478.8		26.6		—			505.4
Corporate securities	1,066.6		32.3		(0.4		)	1,098.5
Residential mortgage-backed securities	459.2		5.8		(2.0		)	463.0
Commercial mortgage-backed securities	100.9		2.8		—			103.7
Asset-backed securities	64.4		1.0		—			65.4
Other securities	177.5		0.5		(1.1		)	176.9
Total fixed maturity securities	$	2,450.2	71.1		(3.6		)	$	2,517.7



At December 31, 2018
Fixed maturity securities
U.S. Treasuries	$	106.7	$	0.9	$	(1.2	)	$	106.4
U.S. Agencies	11.3		0.1		—			11.4
States and municipalities	513.4		15.3		(0.7		)	528.0
Corporate securities	1,106.2		5.8		(21.6		)	1,090.4
Residential mortgage-backed securities	459.1		2.2		(9.8		)	451.5
Commercial mortgage-backed securities	96.7		0.1		(2.5		)	94.3
Asset-backed securities	64.7		0.2		(0.4		)	64.5
Other securities	155.6		—		(5.7		)	149.9
Total fixed maturity securities	$	2,513.7	24.6		(41.9		)	$	2,496.4
Total short-term investments	$	25.0	—		—			$	25.0

Equity securities table

The cost and estimated fair value of the Company’s equity securities recorded at fair value at June 30, 2019 and December 31, 2018 were as follows:



	Cost		Estimated Fair Value
	(in millions)
At June 30, 2019
Equity securities at fair value
Industrial and miscellaneous	$	126.3	$	211.1
Other	16.8		28.0
Total equity securities at fair value	$	143.1	$	239.1



At December 31, 2018
Equity securities at fair value
Industrial and miscellaneous	$	114.6	$	174.8
Other	17.3		25.1
Total equity securities at fair value	$	131.9	$	199.9

Other invested assets

The following table shows the cost and net asset value of the Company's Other invested assets at June 30, 2019. The Company had no Other invested assets at December 31, 2018.



	Cost		Net Asset Value
	(in millions)
At June 30, 2019
Other invested assets
Private equity fund investments	$	2.0	$	2.0
Total other invested assets	$	2.0	$	2.0

Investments classified by contractual maturity date table



	Amortized Cost		Estimated Fair Value
	(in millions)
Due in one year or less	$	145.9	$	146.8
Due after one year through five years	835.5		855.6
Due after five years through ten years	789.1		823.2
Due after ten years	55.2		60.0
Mortgage and asset-backed securities	624.5		632.1
Total	$	2,450.2	$	2,517.7

Unrealized loss on investments table



	June 30, 2019						December 31, 2018
	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
U.S. Treasuries	$	—	$	—		—	$	12.2	$	(0.1	)	7
States and municipalities	—		—			—	70.1		(0.7		)	21
Corporate securities	—		—			—	624.4		(13.4		)	205
Residential mortgage-backed securities	—		—			—	156.9		(2.5		)	59
Commercial mortgage-backed securities	—		—			—	30.9		(0.5		)	13
Asset-backed securities	—		—			—	25.1		(0.2		)	18
Other securities	111.6		(1.1		)	218	137.1		(5.7		)	215
Total less than 12 months	$	111.6	$	(1.1	)	218	$	1,056.7	$	(23.1	)	538

12 months or greater:
Fixed maturity securities
U.S. Treasuries	$	22.8	$	(0.1	)	11	$	72.7	$	(1.1	)	25
Corporate securities	41.4		(0.4		)	19	193.7		(8.2		)	69
Residential mortgage-backed securities	143.4		(2.0		)	58	199.8		(7.3		)	72
Commercial mortgage-backed securities	—		—			—	55.0		(2.0		)	22
Asset-backed securities	—		—			—	16.5		(0.2		)	17
Total 12 months or greater	$	207.6	$	(2.5	)	88	$	537.7	$	(18.8	)	205

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 June 30, 2019
Fixed maturity securities	$	0.6	$	(0.3	)	$	37.6	$	0.3	$	37.6
Equity securities	1.1		(0.8		)	6.8		7.1		—
Total investments	$	1.7	$	(1.1	)	$	44.4	$	7.4	$	37.6

Six Months Ended June 30, 2019
Fixed maturity securities	$	1.6	$	(0.7	)	$	84.8	$	0.9	$	84.8
Equity securities	2.7		(0.9		)	28.0		29.8		—
Total investments	$	4.3	$	(1.6	)	$	112.8	$	30.7	$	84.8



Three Months Ended June 30, 2018
Fixed maturity securities	$	0.3	$	(0.3	)	$	(14.3	)	$	—		$	(14.3	)
Equity securities	2.6		(0.4		)	3.5			5.7			—
Total investments	$	2.9	$	(0.7	)	$	(10.8	)	$	5.7		$	(14.3	)

Six Months Ended June 30, 2018
Fixed maturity securities	$	2.1	$	(2.6	)	$	(59.2	)	$	(0.5	)	$	(59.2	)
Equity securities	8.1		(0.6		)	(9.4		)	(1.9		)	—
Total investments	$	10.2	$	(3.2	)	$	(68.6	)	$	(2.4	)	$	(59.2	)

Investment income table

Net investment income was as follows:



	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019			2018			2019			2018
	(in millions)
Fixed maturity securities	$	20.2		$	19.2		$	40.6		$	37.7
Equity securities	1.9			1.7			3.8			3.3
Cash equivalents and restricted cash	0.5			0.3			1.0			0.5
Gross investment income	22.6			21.2			45.4			41.5
Investment expenses	(1.2		)	(0.9		)	(2.2		)	(1.8		)
Net investment income	$	21.4		$	20.3		$	43.2		$	39.7

Property and Equipment (Tables)

6 Months Ended

Jun. 30, 2019

Property, Plant and Equipment [Abstract]

Property and Equipment [Table Text Block]

Property and equipment consists of the following:



	As of June 30,			As of December 31,
	2019			2018
	(in millions)
Furniture and equipment	$	2.5		$	3.3
Leasehold improvements	5.7			3.2
Computers and software	67.4			61.9
Automobiles	1.1			1.1
Property and equipment, gross	76.7			69.5
Accumulated depreciation	(53.9		)	(51.3		)
Property and equipment, net	$	22.8		$	18.2

Lease, Cost [Table Text Block]

Components of lease expense were as follows:



	Three Months Ended		Six Months Ended
	June 30, 2019		June 30, 2019
	(in millions)
Operating lease expense	$	1.2	$	2.5
Finance lease expense	0.1		0.1
Total lease expense	$	1.3	$	2.6

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

Maturities of lease liabilities were as follows:



	As of June 30, 2019
	Operating Leases			Finance Leases
	(in millions)
2019	$	2.6		$	0.2
2020	4.4			0.2
2021	2.9			0.2
2022	1.9			—
2023	1.8			—
Thereafter	6.2			—
Total lease payments	19.8			0.6
Less: inputed interest	(2.0		)	—
Total	$	17.8		$	0.6

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

Supplemental balance sheet information related to leases was as follows:



	As of June 30, 2019
	(in millions)
Operating leases:
Operating lease right-of-use asset	$	15.7
Operating lease liability	17.8
Finance leases:
Property and equipment, gross	1.1
Accumulated depreciation	(0.5		)
Property and equipment, net	0.6
Other liabilities	$	0.6

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

Supplemental cash flow information related to leases was as follows:



	Six Months Ended
	June 30, 2019
	(in millions)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	2.5
Financing cash flows from finance leases	0.1

Notes Payable (Tables)

6 Months Ended

Jun. 30, 2019

Notes Payable [Abstract]

Schedule of long-term debt instruments table

Notes payable is comprised of the following:



	June 30, 2019		December 31, 2018
	(in millions)
Dekania Surplus Note, due April 29, 2034	$	—	$	10.0
Alesco Surplus Note, due December 15, 2034	—		10.0
Total	$	—	$	20.0

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Change in Estimates (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

Change in Accounting Estimate [Line Items]

Net income

$ 40,700

$ 42,500

$ 92,600

$ 68,100

Change Due To Estimated Reserves Ceded Under LPT Agreement Member [Member]

Change in Accounting Estimate [Line Items]

LPT reserve adjustment

(5,300)

Cumulative adjustment to the Deferred Gain

^[1]

(1,800)

(2,200)

(1,800)

Net income

$ 1,800

Basic and Diluted

$ 0.06

Change to Contingent Profit Commission [Member]

Change in Accounting Estimate [Line Items]

Net income

$ 200

$ 500

$ 200

Change in estimate of contingent commission receivable

$ 300

Basic and Diluted

$ 0.01

[1]

The cumulative adjustment to the Deferred reinsurance gain–LPT Agreement (Deferred Gain) was also recognized in losses and LAE incurred in the Company's Consolidated Statement of Comprehensive Income, so that the Deferred Gain reflects the balance that would have existed had the revised loss and LAE reserves been recognized at the inception of the LPT Agreement.

- Definition

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

+ References + Details

Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments at fair value	$ 2,756,800	$ 2,721,300
Total Investments at fair value, estimated fair value	2,756,800	2,721,300
Cash and cash equivalents	105,500	101,400
Cash and cash equivalents, estimated fair value	105,500	101,400
Equity securities at cost	6,700	6,400
Restricted cash and cash equivalents	300	600
Notes payable	0	20,000
Notes Payable, estimated fair value	0	23,500
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	$ 300	$ 600

Valuation of Financial Instruments Fair Value of Financial Instruments, Reconciliation of Level 3 Securities (Details) - USD ($)
$ in Millions

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Beginning balance, January 1

$ 2,727.7

Ending balance, June 30

2,765.5

Fair Value, Inputs, Level 3 [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Beginning balance, January 1

0.0

$ 4.7

Transfers out of Level 3 (1)

^[1]

0.0

(4.7)

Purchases and sales, net

0.0

Ending balance, June 30

$ 0.0

[1]	The transfer during the six months ended June 30, 2018 was the result of adoption of ASU 2016-01, which specified that FHLB stock shall be carried at cost and is therefore excluded from the fair value hierarchy.

Valuation of Financial Instruments Investments at NAV (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
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	$ 48.0
Cash Equivalents Measured at Net Asset Value	68.4	$ 57.5
Other invested assets at NAV	$ 2.0	$ 0.0

Investments Available for Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	$ 2,450,200	$ 2,513,700
Debt securities, available-for-sale, gross unrealized gain	71,100	24,600
Debt securities, available-for-sale, gross unrealized loss	(3,600)	(41,900)
Fixed maturity securities, fair value	2,517,700	2,496,400
Short-term Investments	0	25,000
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	93,100	106,700
Debt securities, available-for-sale, gross unrealized gain	1,900	900
Debt securities, available-for-sale, gross unrealized loss	(100)	(1,200)
Fixed maturity securities, fair value	94,900	106,400
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	9,700	11,300
Debt securities, available-for-sale, gross unrealized gain	200	100
Debt securities, available-for-sale, gross unrealized loss	0	0
Fixed maturity securities, fair value	9,900	11,400
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	478,800	513,400
Debt securities, available-for-sale, gross unrealized gain	26,600	15,300
Debt securities, available-for-sale, gross unrealized loss	0	(700)
Fixed maturity securities, fair value	505,400	528,000
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	1,066,600	1,106,200
Debt securities, available-for-sale, gross unrealized gain	32,300	5,800
Debt securities, available-for-sale, gross unrealized loss	(400)	(21,600)
Fixed maturity securities, fair value	1,098,500	1,090,400
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	459,200	459,100
Debt securities, available-for-sale, gross unrealized gain	5,800	2,200
Debt securities, available-for-sale, gross unrealized loss	(2,000)	(9,800)
Fixed maturity securities, fair value	463,000	451,500
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	100,900	96,700
Debt securities, available-for-sale, gross unrealized gain	2,800	100
Debt securities, available-for-sale, gross unrealized loss	0	(2,500)
Fixed maturity securities, fair value	103,700	94,300
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	64,400	64,700
Debt securities, available-for-sale, gross unrealized gain	1,000	200
Debt securities, available-for-sale, gross unrealized loss	0	(400)
Fixed maturity securities, fair value	65,400	64,500
Other Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, amortized cost	177,500	155,600
Debt securities, available-for-sale, gross unrealized gain	500	0
Debt securities, available-for-sale, gross unrealized loss	(1,100)	(5,700)
Fixed maturity securities, fair value	$ 176,900	149,900
Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Total AFS, amortized cost		25,000
Total AFS, gross unrealized gain		0
Total AFS, gross unrealized loss		0
Total AFS investments		$ 25,000

Investments, Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Amortized Cost
Due in one year or less, amortized cost	$ 145,900
Due after one year through five years, amortized cost	835,500
Due after five years through ten years, amortized cost	789,100
Due after ten years, amortized cost	55,200
Mortgage and asset-backed securities, amortized cost	624,500
Total, amortized cost	2,450,200	$ 2,513,700
Estimated Fair Value
Due in one year or less, fair value	146,800
Due after one year through five years, fair value	855,600
Due after five years through ten years, fair value	823,200
Due after ten years, fair value	60,000
Mortgage and asset-backed securities, fair value	632,100
Total, fair value	$ 2,517,700	$ 2,496,400

Investments, Continuous Loss Position (Details)	3 Months Ended		6 Months Ended
Investments, Continuous Loss Position (Details)	Jun. 30, 2019 USD ($) shares	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) shares	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 111,600,000		$ 111,600,000		$ 1,056,700,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	207,600,000		207,600,000		537,700,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,100,000		1,100,000		23,100,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 2,500,000		$ 2,500,000		$ 18,800,000
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	218		218		538
Debt Securities, number of issues in loss position, 12 months or greater	88		88		205
Other than temporary impairment, credit losses recognized in earnings	$ 0	$ 0	$ 0	$ 2,000,000.0
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	$ 2,000,000.0
Total impairments, number of securities \| shares	57		57
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0		$ 0		$ 12,200,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	22,800,000		22,800,000		72,700,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0		100,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 100,000		$ 100,000		$ 1,100,000
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	0		0		7
Debt Securities, number of issues in loss position, 12 months or greater	11		11		25
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	$ 0		$ 0		$ 70,100,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0		$ 0		$ 700,000
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	0		0		21
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0		$ 0		$ 624,400,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	41,400,000		41,400,000		193,700,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0		13,400,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 400,000		$ 400,000		$ 8,200,000
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	0		0		205
Debt Securities, number of issues in loss position, 12 months or greater	19		19		69
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	$ 0		$ 0		$ 156,900,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	143,400,000		143,400,000		199,800,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0		2,500,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 2,000,000.0		$ 2,000,000.0		$ 7,300,000
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	0		0		59
Debt Securities, number of issues in loss position, 12 months or greater	58		58		72
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	$ 0		$ 0		$ 30,900,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0		0		55,000,000.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0		500,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0		$ 0		$ 2,000,000.0
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	0		0		13
Debt Securities, number of issues in loss position, 12 months or greater	0		0		22
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0		$ 0		$ 25,100,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0		0		16,500,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0		200,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0		$ 0		$ 200,000
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	0		0		18
Debt Securities, number of issues in loss position, 12 months or greater	0		0		17
Other Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 111,600,000		$ 111,600,000		$ 137,100,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1,100,000		$ 1,100,000		$ 5,700,000
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	218		218		215

Investments Investments, Net Realized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity securities:
Equity Securities, FV-NI, Realized Gain			$ 2,700	$ 8,100
Equity Securities, FV-NI, Realized Loss			900	600
AFS, change in unrealized gains (losses)
AFS, change unrealized gains (losses) on fixed maturity and equity securities reflected in AOCI	$ 37,600	$ (14,300)	84,800	(59,200)
AFS, net realized gains (losses)
AFS, Gross gains from sales		2,900
AFS, Gross losses from sales		(700)
Net realized and unrealized (losses) gains on investments	7,400	5,700	30,700	(2,400)
Total gross realized gains	1,700		4,300	10,200
Total gross realized losses	(1,100)		(1,600)	(3,200)
Total change in net unrealized gains (losses)	44,400	(10,800)	112,800	(68,600)
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Equity Securities, FV-NI, Unrealized Gain (Loss)		3,500	28,000	(9,400)
Debt Securities [Member]
AFS, change in unrealized gains (losses)
AFS, change unrealized gains (losses) on fixed maturity and equity securities reflected in AOCI	37,600	(14,300)	84,800	(59,200)
AFS, net realized gains (losses)
AFS, Gross gains from sales	600	300	1,600	2,100
AFS, Gross losses from sales	(300)	(300)	(700)	(2,600)
Net realized and unrealized (losses) gains on investments	300	0	900	(500)
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)
AFS, Gross gains from sales		2,600
AFS, Gross losses from sales		(400)
Net realized and unrealized (losses) gains on investments	7,100	$ 5,700	$ 29,800	$ (1,900)
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Trading Securities, Realized Gain	1,100
Trading Securities, Realized Loss	800
Trading Securities, Change in Unrealized Holding Gain (Loss)	$ 6,800

Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Net Investment Income (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 22.6	$ 21.2	$ 45.4	$ 41.5
Investment expenses	1.2	0.9	2.2	1.8
Net investment income	21.4	20.3	43.2	39.7
Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income related to fixed maturity securities and short-term investments and cash equivalents	20.2	19.2	40.6	37.7
Equity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income related to equity securities	1.9	1.7	3.8	3.3
Short-term Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income related to fixed maturity securities and short-term investments and cash equivalents	$ 0.5	$ 0.3	$ 1.0	$ 0.5

Property and Equipment Property and Equipment (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Property and Equipment [Line Items]
Property and equipment, gross	$ 76.7	$ 76.7		$ 69.5
Accumulated depreciation, depletion and amortization, property and equipment	(53.9)	(53.9)		(51.3)
Property and equipment, net	22.8	22.8		18.2
Utilities operating expense, depreciation and amortization	2.6	3.7		6.1
Payments to develop software	0.8	1.6		2.9
Cloud computing arrangements	29.5	29.5		26.0
Amortization of cloud computing arrangements	1.1	2.1	$ 0.0	0.8
Furniture and equipment
Property and Equipment [Line Items]
Property and equipment, gross	2.5	2.5		3.3
Leasehold improvements
Property and Equipment [Line Items]
Property and equipment, gross	5.7	5.7		3.2
Computer and software
Property and Equipment [Line Items]
Property and equipment, gross	67.4	67.4		61.9
Automobiles
Property and Equipment [Line Items]
Property and equipment, gross	$ 1.1	$ 1.1		$ 1.1

Property and Equipment Leases, Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Lessee, operating lease liabilities due
Operating lease liabilities due next twelve months	$ 2.6
Operating lease liabilities due year two	4.4
Operating lease liabilities due year three	2.9
Operating lease liabilities due year four	1.9
Operating lease liabilities due year five	1.8
Operating lease liabilities due after year five	6.2
Operating lease liabilities due	19.8
Less: inputed interest, Operating lease liability	(2.0)
Operating lease liability	$ 17.8	$ 19.0	$ 0.0
Operating lease, weighted average remaining lease term	6 years
Operating lease, weighted average discount rate, percent	3.30%
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	0.2
Finance lease liabilities due year four	0.0
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 1 month 6 days
Finance lease, weighted average discount rate, percent	3.70%

Property and Equipment Leases, Supplement Balance Sheet Information (Details) - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 15.7	$ 16.8	$ 0.0
Operating lease liability	17.8	$ 19.0	0.0
Property and equipment, gross	76.7		69.5
Accumulated depreciation, depletion and amortization, property and equipment	(53.9)		(51.3)
Property and equipment, net	22.8		18.2
Other liabilities	42.8		$ 74.0
Finance leases [Member]
Lessee, Lease, Description [Line Items]
Property and equipment, gross	1.1
Accumulated depreciation, depletion and amortization, property and equipment	(0.5)
Property and equipment, net	0.6
Other liabilities	$ 0.6

Liability for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Unpaid losses and LAE at beginning of period	$ 2,189.3	$ 2,258.1	$ 2,207.9	$ 2,266.1
Less reinsurance recoverable, excluding bad debt allowance, on unpaid losses and LAE	498.7	531.1	504.4	537.0
Net unpaid losses and LAE at beginning of period	1,690.6	1,727.0	1,703.5	1,729.1
Losses and LAE, net of reinsurance, incurred during the period related to:
Current period	116.1	111.2	229.4	221.6
Prior periods	(23.7)	(16.5)	(45.9)	(28.9)
Total net losses and LAE incurred during the period	92.4	94.7	183.5	192.7
Deduct payments for losses and LAE, net of reinsurance, related to:
Current period	23.2	20.0	30.6	25.9
Prior periods	82.2	86.3	178.8	180.5
Total net paid losses and LAE during the period	105.4	106.3	209.4	206.4
Ending unpaid losses and LAE, net of reinsurance	1,677.6	1,715.4	1,677.6	1,715.4
Reinsurance recoverable, excluding bad debt allowance, on unpaid losses and LAE	484.2	512.5	484.2	512.5
Unpaid losses and LAE at end of period	2,161.8	2,227.9	2,161.8	2,227.9
Impact of the LPT Agreement	5.7	6.9	8.2	9.5
Involuntary Assigned Risk Business [Member]
Losses and LAE, net of reinsurance, incurred during the period related to:
Prior periods	0.3		0.1	(0.4)
Voluntary Risk Business [Member]
Losses and LAE, net of reinsurance, incurred during the period related to:
Prior periods	$ (24.0)	$ (16.5)	$ (46.0)	$ (28.5)

LPT Agreement (Details) - USD ($)
$ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

Dec. 31, 2018

Reinsurance Agreement [Line Items]

Liabilities for the incurred but unpaid losses and LAE related to claims prior to July 1, 1995

$ 1,500,000

Ceded premiums written

775,000

Amortization of deferred gain

3,700

$ 4,200

6,200

$ 6,800

Net income

40,700

42,500

92,600

$ 68,100

Deferred reinsurance gain—LPT Agreement

141,700

$ 149,600

Estimated remaining liabilities - LPT Agreement

391,300

408,200

Paid losses and LAE claims related to LPT

785,300

$ 773,700

Indemnification Agreement [Member]

Reinsurance Agreement [Line Items]

Coverage provided under LPT Agreement

2,000,000

Change to Contingent Profit Commission [Member]

Reinsurance Agreement [Line Items]

Net income

200

500

200

Change in estimate of contingent commission receivable

(300)

Change Due To Estimated Reserves Ceded Under LPT Agreement Member [Member]

Reinsurance Agreement [Line Items]

Cumulative adjustment to the Deferred Gain

^[1]

1,800

$ 2,200

1,800

Net income

$ 1,800

[1]

Notes Payable Outstanding (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Notes payable	$ 0	$ 0	$ 20,000
Dekania Surplus Note [Member]
Debt Instrument [Line Items]
Notes payable	0	$ 0	10,000
Repayments of Notes Payable	10,200
Interest rate, basis points in excess of the 90-day LIBOR		425 basis points in excess of the 90-day LIBOR
Alesco Surplus Note [Member]
Debt Instrument [Line Items]
Notes payable	0	$ 0	$ 10,000
Repayments of Notes Payable	$ 10,200
Interest rate, basis points in excess of the 90-day LIBOR		405 basis points in excess of the 90-day LIBOR

Notes Payable Letters of Credit (Details) $ in Millions	6 Months Ended
Notes Payable Letters of Credit (Details) $ in Millions	Jun. 30, 2019 USD ($)
Letters of Credit Facilities [Line Items]
Letters of credit, unused capacity, commitment fee percentage	15.00%
Federal Home Loan Bank [Member]
Letters of Credit Facilities [Line Items]
Letters of credit facilities, maximum borrowing capacity	$ 260.0
Letters of credit collateral amount	356.8
Federal Home Loan Bank [Member] \| EAC
Letters of Credit Facilities [Line Items]
Letters of credit facilities, maximum borrowing capacity	60.0
Federal Home Loan Bank [Member] \| ECIC
Letters of Credit Facilities [Line Items]
Letters of credit facilities, maximum borrowing capacity	90.0
Federal Home Loan Bank [Member] \| EPIC
Letters of Credit Facilities [Line Items]
Letters of credit facilities, maximum borrowing capacity	$ 110.0

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income [Abstract]
Net unrealized gains (losses) on investments, before taxes	$ 67,500	$ (17,300)
Deferred tax (expense) benefit on net unrealized gains (losses)	(14,200)	3,600
Total accumulated other comprehensive income (loss)	$ 53,300	$ (13,700)

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

1 Months Ended

6 Months Ended

12 Months Ended

May 31, 2018

Jun. 30, 2019

Jun. 30, 2018

Dec. 31, 2018

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

Stock-options exercised

5,186

13,800

57,091

Stock Option [Member]

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

Number of outstanding options or share units

180,460

Restricted Stock Units (RSUs) [Member]

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

Share-based compensation award, shares issued

17,050

Share-based compensation options, exercise price on grant date

$ 40.76

Fair value of awards awarded on grant date

$ 0.7

Number of outstanding options or share units

241,159

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]

72,060

Share-based compensation options, exercise price on grant date

^[1]

$ 40.54

Fair value of awards awarded on grant date

^[1]

$ 2.9

Vesting rights for RSUs awarded

vest 25% on March 15, 2020, 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

249,144

Performance Shares [Member] | Officer [Member]

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

Share-based compensation award, shares issued

^[2]

95,940

Share-based compensation options, exercise price on grant date

^[2]

$ 40.54

Fair value of awards awarded on grant date

^[2]

$ 3.9

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 2019 were awarded to certain employees of the Company and vest 25% on March 15, 2020, 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 2019 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 Thousands	3 Months Ended		6 Months Ended
Earnings Per Share (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Net income available to stockholders - basic and diluted	$ 40,700	$ 42,500	$ 92,600	$ 68,100
Weighted average number of shares outstanding - basic	32,077,698	32,880,023	32,197,523	32,843,448
Effect of dilutive securities:
Dilutive securities	372,930	342,683	442,362	416,311
Weighted average number of shares outstanding - diluted	32,450,628	33,222,706	32,639,885	33,259,759
Performance Shares [Member]
Effect of dilutive securities:
Dilutive securities	233,635	202,149	290,130	253,098
Share-based Payment Arrangement, Option [Member]
Effect of dilutive securities:
Dilutive securities	78,836	100,357	79,487	100,635
Restricted Stock Units (RSUs) [Member]
Effect of dilutive securities:
Dilutive securities	60,459	40,177	72,745	62,578

- Definition

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

+ References + Details

Consolidated Statements of Stockholders Equity (Parentheticals) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]
Change in net unrealized (losses) gains on investments, net of tax	$ (7.9)	$ 3.0	$ (17.8)	$ 12.5

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2019
Income Taxes [Abstract]
Income Taxes	Income Taxes Income tax expense for interim periods is measured using an estimated effective tax rate for the annual period. The Company's effective tax rates were 18.1% and 17.0% for the three and six months ended June 30, 2019, respectively, compared to 17.2% and 15.6% for the same periods of 2018. Tax-advantaged investment income, Deferred Gain amortization, LPT Reserve Adjustments, LPT Contingent Commission Adjustments, and certain other adjustments reduced the Company's effective income tax rate below the U.S. statutory rate of 21%.

LPT Agreement	6 Months Ended
LPT Agreement	Jun. 30, 2019
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 $3.7 million and $4.2 million of the Deferred Gain for the three months ended June 30, 2019 and 2018, respectively, and $6.2 million and $6.8 million for the six months ended June 30, 2019 and 2018, respectively. Additionally, the Deferred Gain was further reduced by $1.8 million and $2.2 million for the three and six months ended June 30, 2019 and 2018, respectively, due to a favorable LPT Reserve Adjustment and favorable LPT Contingent Commission Adjustments in the amount of $0.2 million and $0.5 million for the three and six months ended June 30, 2019 and 2018, respectively. The remaining Deferred Gain was $141.7 million and $149.6 million as of June 30, 2019 and December 31, 2018, respectively. The estimated remaining liabilities subject to the LPT Agreement were $391.3 million and $408.2 million as of June 30, 2019 and December 31, 2018, respectively. Losses and LAE paid with respect to the LPT Agreement totaled $785.3 million and $773.7 million from inception through June 30, 2019 and December 31, 2018, respectively.

Basis of Presentation Pending Purchase of PRUS (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Business Acquisition [Line Items]
Estimated statutory capital and surplus of pending acquisition	$ 47.0
Net cash payment to acquire business	$ 5.8

Income Taxes (Details)	3 Months Ended		6 Months Ended
Income Taxes (Details)	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory tax rate			21.00%
Effective tax rate	18.10%	17.20%	17.00%	15.60%

Fair Value of Financial Instruments, Fair Value Inputs (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	$ 2,517,700	$ 2,496,400
Equity Securities, FV-NI	239,100	199,900
Short-term Investments	0	25,000
Investments	2,765,500	2,727,700
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	239,100	199,900
Short-term Investments	0	0
Investments	239,100	199,900
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		25,000
Investments	2,517,700	2,521,400
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0	$ 0	$ 4,700
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	2,517,700	2,496,400
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	94,900	106,400
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	94,900	106,400
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	9,900	11,400
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	9,900	11,400
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	505,400	528,000
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	505,400	528,000
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	1,098,500	1,090,400
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	1,098,500	1,090,400
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	463,000	451,500
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	463,000	451,500
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	103,700	94,300
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	103,700	94,300
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	65,400	64,500
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	65,400	64,500
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
Other Debt Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, fair value	176,900	149,900
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	176,900	149,900
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	211,100	174,800
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	211,100	174,800
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	28,000	25,100
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	28,000	25,100
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

Investments Equity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Equity Securities and Other [Line Items]
Equity Securities, FV-NI, Cost	$ 143,100	$ 131,900
Equity Securities, FV-NI	239,100	199,900
Industrial and Miscellaneous [Member]
Schedule of Equity Securities and Other [Line Items]
Equity Securities, FV-NI, Cost	126,300	114,600
Equity Securities, FV-NI	211,100	174,800
Other [Member]
Schedule of Equity Securities and Other [Line Items]
Equity Securities, FV-NI, Cost	16,800	17,300
Equity Securities, FV-NI	$ 28,000	$ 25,100

Investments Investments, Held in Trust or on Deposit (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Deposit Assets [Abstract]
Investments	$ 2,765.5	$ 2,727.7
Assets Held-in-trust [Abstract]
Funds Held under Reinsurance Agreements, Asset	3.2	23.2
Federal Home Loan Bank [Member]
Deposit Assets [Abstract]
Investments	260.0
Required by various state laws and regulations to hold securities or letters of credit in depository account [Member]
Deposit Assets [Abstract]
Investments	$ 902.2	$ 867.7

Investments Other Invested Assets (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Other Invest Assets [Abstract]
Total other invested assets	$ 2.0	$ 0.0

Property and Equipment Leases (Details)	6 Months Ended
Property and Equipment Leases (Details)	Jun. 30, 2019
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, operating lease, remaining lease term	1 year
Lessee, operating lease, renewal term	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, operating lease, remaining lease term	8 years
Lessee, operating lease, renewal term	10 years

Property and Equipment Leases, Components of Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Components of Lease Expense [Abstract]
Operating lease expense	$ 1.2	$ 2.5
Finance lease expense	0.1	0.1
Total lease expense	$ 1.3	$ 2.6

Property and Equipment Leases, Supplemental Cash Flow Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Leases, Supplement Balance Sheet Information [Abstract]
Operating cash flows from operating leases	$ 2.5
Financing cash flows from finance leases	$ 0.1