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Acquisition of Business - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 28, 2018
Jul. 13, 2018
Jul. 02, 2018
Jun. 29, 2018
May 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]                
Repayments of secured debt           $ 383,600,000 $ 2,500,000 $ 2,900,000
Repayments of debt $ 215,000,000.0       $ 35,000,000.0      
Goodwill           1,114,000,000.0 $ 1,112,400,000  
Infinity Property and Casualty Corporation                
Business Acquisition [Line Items]                
Percentage of voting interests acquired     100.00%          
Total consideration transferred     $ 1,500,000,000          
Business acquisition, interest issued (in shares)     13,184,107          
Business acquisition, fair value of interests issued     $ 982,500,000          
Share price     $ 74.53          
Cash consideration     $ 564,600,000          
Assumed legal and tax accruals           1,800,000    
Acquired current income tax assets           200,000    
Goodwill     791,000,000.0     $ 1,600,000    
Secured Debt | Infinity Property and Casualty Corporation                
Business Acquisition [Line Items]                
Borrowings     $ 110,000,000.0 $ 250,000,000.0        
Repayments of secured debt   $ 110,000,000.0            
Restricted Stock Units (RSUs)                
Business Acquisition [Line Items]                
Business acquisition, interest issued (in shares)     44,010          
Restricted Stock Units (RSUs) | Infinity Property and Casualty Corporation                
Business Acquisition [Line Items]                
Business acquisition, fair value of interests issued     $ 3,300,000          
Consideration related to pre-close activities     1,600,000          
Consideration related to future services     $ 1,700,000