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Investments - Schedule of Fixed Maturities (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost $ 6,929,600,000 $ 6,692,700,000    
Gross unrealized gains 609,600,000      
Gross unrealized loss (55,200,000)      
Fixed maturities, allowance for credit losses (4,600,000) (3,300,000) $ (4,600,000) $ 0
Fixed maturities at fair value 7,479,400,000 7,605,900,000    
Investments in Fixed Maturities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost   6,692,700,000    
Gross unrealized gains   948,200,000    
Gross unrealized loss   (31,700,000)    
Fixed maturities at fair value   7,605,900,000    
Debt securities, available-for-sale, unrealized loss position, accumulated loss 55,200,000 31,700,000    
Investments in Fixed Maturities | Investment-grade        
Debt Securities, Available-for-sale [Line Items]        
Debt securities, available-for-sale, unrealized loss position, accumulated loss 39,800,000 8,000,000.0    
U.S. Government and Government Agencies and Authorities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost 498,000,000.0 536,500,000    
Gross unrealized gains 35,700,000 48,900,000    
Gross unrealized loss (1,300,000) (100,000)    
Fixed maturities, allowance for credit losses 0      
Fixed maturities at fair value 532,400,000 585,300,000    
Debt securities, available-for-sale, unrealized loss position, accumulated loss 1,300,000 100,000    
States and Political Subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost 1,538,600,000 1,404,300,000    
Gross unrealized gains 140,900,000 185,400,000    
Gross unrealized loss (11,600,000) (200,000)    
Fixed maturities, allowance for credit losses 0      
Fixed maturities at fair value 1,667,900,000 1,589,500,000    
Debt securities, available-for-sale, unrealized loss position, accumulated loss 11,600,000 200,000    
Foreign Governments        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost 6,300,000 6,600,000    
Gross unrealized gains 0 0    
Gross unrealized loss (1,200,000) (1,100,000)    
Fixed maturities, allowance for credit losses (300,000) (300,000) (1,100,000) 0
Fixed maturities at fair value 4,800,000 5,200,000    
Debt securities, available-for-sale, unrealized loss position, accumulated loss 1,200,000 1,100,000    
Bonds and Notes        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost 3,886,300,000 3,749,500,000    
Gross unrealized gains 419,200,000 689,500,000    
Gross unrealized loss (30,400,000) (10,600,000)    
Fixed maturities, allowance for credit losses (4,300,000) (3,000,000.0) $ (3,500,000) $ 0
Fixed maturities at fair value 4,270,800,000 4,425,400,000    
Debt securities, available-for-sale, unrealized loss position, accumulated loss 30,400,000 10,600,000    
Redeemable Preferred Stocks        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost 7,000,000.0 7,000,000.0    
Gross unrealized gains 100,000 500,000    
Gross unrealized loss (100,000) 0    
Fixed maturities, allowance for credit losses 0      
Fixed maturities at fair value 7,000,000.0 7,500,000    
Debt securities, available-for-sale, unrealized loss position, accumulated loss 100,000      
Collateralized Loan Obligations        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost 791,000,000.0 785,100,000    
Gross unrealized gains 2,400,000 2,300,000    
Gross unrealized loss (10,500,000) (19,700,000)    
Fixed maturities, allowance for credit losses 0      
Fixed maturities at fair value 782,900,000 767,700,000    
Debt securities, available-for-sale, unrealized loss position, accumulated loss 10,500,000 19,700,000    
Other Mortgage- and Asset-backed        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturities, at amortized cost 202,400,000 203,700,000    
Gross unrealized gains 11,300,000 21,600,000    
Gross unrealized loss (100,000) 0    
Fixed maturities, allowance for credit losses 0      
Fixed maturities at fair value 213,600,000 225,300,000    
Debt securities, available-for-sale, unrealized loss position, accumulated loss $ 100,000 $ 0