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Investments - Continuous Unrealized Loss (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
U.S. Government and Government Agencies and Authorities      
Fixed Maturities:      
Fair Value $ 123.6 $ 337.3  
Fair Value 330.9 126.5  
Fair Value 454.5 463.8  
Fixed Maturities:      
Unrealized Losses (7.3) (49.3)  
Unrealized Losses (65.7) (36.5)  
Unrealized Losses (73.0) (85.8)  
States and Political Subdivisions      
Fixed Maturities:      
Fair Value 332.1 854.7  
Fair Value 724.1 276.8  
Fair Value 1,056.2 1,131.5  
Fixed Maturities:      
Unrealized Losses (17.5) (140.6)  
Unrealized Losses (176.7) (97.7)  
Unrealized Losses (194.2) (238.3)  
Foreign Governments      
Fixed Maturities:      
Fair Value 0.6 0.1  
Fair Value 2.4 2.6  
Fair Value 3.0 2.7  
Fixed Maturities:      
Unrealized Losses 0.0 0.0  
Unrealized Losses (0.8) (0.9)  
Unrealized Losses (0.8) (0.9)  
Corporate Debt Securities [Member]      
Fixed Maturities:      
Fair Value 1,811.8 2,730.6  
Fair Value 1,312.7 424.4  
Fair Value 3,124.5 3,155.0  
Fixed Maturities:      
Unrealized Losses (132.9) (373.9)  
Unrealized Losses (285.6) (125.8)  
Unrealized Losses (418.5) (499.7)  
Redeemable Preferred Stocks      
Fixed Maturities:      
Fair Value 3.0   $ 7.7
Fair Value 4.7   0.0
Fair Value 7.7   7.7
Fixed Maturities:      
Unrealized Losses (0.2)   (1.0)
Unrealized Losses (0.8)   0.0
Unrealized Losses (1.0)   $ (1.0)
Collateralized Loan Obligations      
Fixed Maturities:      
Fair Value 278.5 568.2  
Fair Value 694.2 373.9  
Fair Value 972.7 942.1  
Fixed Maturities:      
Unrealized Losses (11.9) (34.2)  
Unrealized Losses (39.3) (26.6)  
Unrealized Losses (51.2) (60.8)  
Other Mortgage- and Asset-backed      
Fixed Maturities:      
Fair Value 105.6 205.4  
Fair Value 189.6 79.5  
Fair Value 295.2 284.9  
Fixed Maturities:      
Unrealized Losses (8.5) (28.9)  
Unrealized Losses (37.9) (21.4)  
Unrealized Losses (46.4) (50.3)  
Investments in Fixed Maturities      
Fixed Maturities:      
Fair Value 2,655.2 4,704.0  
Fair Value 3,258.6 1,283.7  
Fair Value 5,913.8 5,987.7  
Fixed Maturities:      
Unrealized Losses (178.3) (627.9)  
Unrealized Losses (606.8) (308.9)  
Unrealized Losses $ (785.1) (936.8)  
Investments in Fixed Maturities | Non-investment-grade      
Fixed Maturities:      
Unrealized Losses   $ (32.8)