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Investments - Continuous Unrealized Loss (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
U.S. Government and Government Agencies and Authorities      
Fixed Maturities:      
Fair Value $ 127.6 $ 337.3  
Fair Value 365.3 126.5  
Fair Value 492.9 463.8  
Fixed Maturities:      
Unrealized Losses (5.0) (49.3)  
Unrealized Losses (78.7) (36.5)  
Unrealized Losses (83.7) (85.8)  
States and Political Subdivisions      
Fixed Maturities:      
Fair Value 235.1 854.7  
Fair Value 843.1 276.8  
Fair Value 1,078.2 1,131.5  
Fixed Maturities:      
Unrealized Losses (8.6) (140.6)  
Unrealized Losses (198.7) (97.7)  
Unrealized Losses (207.3) (238.3)  
Foreign Governments      
Fixed Maturities:      
Fair Value 0.9 0.1  
Fair Value 2.2 2.6  
Fair Value 3.1 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 1,163.4 2,730.6  
Fair Value 2,045.4 424.4  
Fair Value 3,208.8 3,155.0  
Fixed Maturities:      
Unrealized Losses (59.3) (373.9)  
Unrealized Losses (406.3) (125.8)  
Unrealized Losses (465.6) (499.7)  
Redeemable Preferred Stocks      
Fixed Maturities:      
Fair Value 0.0   $ 7.7
Fair Value 7.6   0.0
Fair Value 7.6   7.7
Fixed Maturities:      
Unrealized Losses 0.0   (1.0)
Unrealized Losses (1.1)   0.0
Unrealized Losses (1.1)   $ (1.0)
Collateralized Loan Obligations      
Fixed Maturities:      
Fair Value 47.4 568.2  
Fair Value 884.1 373.9  
Fair Value 931.5 942.1  
Fixed Maturities:      
Unrealized Losses (0.6) (34.2)  
Unrealized Losses (45.3) (26.6)  
Unrealized Losses (45.9) (60.8)  
Other Mortgage- and Asset-backed      
Fixed Maturities:      
Fair Value 22.7 205.4  
Fair Value 277.9 79.5  
Fair Value 300.6 284.9  
Fixed Maturities:      
Unrealized Losses (0.3) (28.9)  
Unrealized Losses (52.5) (21.4)  
Unrealized Losses (52.8) (50.3)  
Investments in Fixed Maturities      
Fixed Maturities:      
Fair Value 1,597.1 4,704.0  
Fair Value 4,425.6 1,283.7  
Fair Value 6,022.7 5,987.7  
Fixed Maturities:      
Unrealized Losses (73.8) (627.9)  
Unrealized Losses (783.4) (308.9)  
Unrealized Losses (857.2) (936.8)  
Investments in Fixed Maturities | Non-investment-grade      
Fixed Maturities:      
Unrealized Losses $ (30.1) $ (32.8)