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Investments - Schedule of Fixed Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost $ 7,546.9      
Gross unrealized gains 15.7      
Gross unrealized loss (880.4)      
Fixed maturities, allowance for credit losses (7.5) $ (8.2) $ 7.1 $ 9.6
Fixed maturities at fair value 6,674.7      
Investments in Fixed Maturities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost   7,565.8    
Gross unrealized gains   54.6    
Gross unrealized loss   (730.3)    
Fixed maturities at fair value   6,881.9    
U.S. Government and Government Agencies and Authorities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost 574.9 594.1    
Gross unrealized gains 0.7 1.9    
Gross unrealized loss (100.1) (84.5)    
Fixed maturities, allowance for credit losses 0.0 0.0    
Fixed maturities at fair value 475.5 511.5    
States and Political Subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost 1,550.9 1,575.9    
Gross unrealized gains 4.5 16.3    
Gross unrealized loss (215.4) (189.8)    
Fixed maturities, allowance for credit losses (0.3) (0.5) 0.4 0.7
Fixed maturities at fair value 1,339.7 1,401.9    
Foreign Governments        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost 5.1 4.4    
Gross unrealized gains 0.0 0.0    
Gross unrealized loss (0.5) (0.6)    
Fixed maturities, allowance for credit losses 0.0 0.0    
Fixed maturities at fair value 4.6 3.8    
Corporate Bonds and Notes        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost 4,095.4 4,046.8    
Gross unrealized gains 8.3 35.5    
Gross unrealized loss (509.9) (383.8)    
Fixed maturities, allowance for credit losses (7.2) (7.7) $ 6.7 $ 8.9
Fixed maturities at fair value 3,586.6 3,690.8    
Redeemable Preferred Stocks        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost 11.0 9.0    
Gross unrealized gains 0.1 0.1    
Gross unrealized loss (1.2) (0.8)    
Fixed maturities, allowance for credit losses 0.0 0.0    
Fixed maturities at fair value 9.9 8.3    
Collateralized Loan Obligations        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost 896.4 973.6    
Gross unrealized gains 2.0 0.7    
Gross unrealized loss (12.5) (24.5)    
Fixed maturities, allowance for credit losses 0.0 0.0    
Fixed maturities at fair value 885.9 949.8    
Other Mortgage- and Asset-backed        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost 413.2 362.0    
Gross unrealized gains 0.1 0.1    
Gross unrealized loss (40.8) (46.3)    
Fixed maturities, allowance for credit losses 0.0 0.0    
Fixed maturities at fair value $ 372.5 $ 315.8