v3.19.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2019
Apr. 18, 2019
Document and Entity Information [Abstract]    
Document Type 10-Q  
Entity Registrant Name EMPLOYERS HOLDINGS, INC.  
Amendment Flag false  
Document Period End Date Mar. 31, 2019  
Entity Central Index Key 0001379041  
Current Fiscal Year End Date --12-31  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   32,052,420
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1