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Investments - Continuous Unrealized Loss (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
U.S. Government and Government Agencies and Authorities      
Fixed Maturities:      
Fair Value $ 93.4 $ 337.3  
Fair Value 381.9 126.5  
Fair Value 475.3 463.8  
Fixed Maturities:      
Unrealized Losses (4.1) (49.3)  
Unrealized Losses (108.6) (36.5)  
Unrealized Losses (112.7) (85.8)  
States and Political Subdivisions      
Fixed Maturities:      
Fair Value 374.3 854.7  
Fair Value 873.5 276.8  
Fair Value 1,247.8 1,131.5  
Fixed Maturities:      
Unrealized Losses (22.0) (140.6)  
Unrealized Losses (272.7) (97.7)  
Unrealized Losses (294.7) (238.3)  
Foreign Governments      
Fixed Maturities:      
Fair Value 0.1 0.1  
Fair Value 2.4 2.6  
Fair Value 2.5 2.7  
Fixed Maturities:      
Unrealized Losses 0.0 0.0  
Unrealized Losses (0.9) (0.9)  
Unrealized Losses (0.9) (0.9)  
Corporate Debt Securities [Member]      
Fixed Maturities:      
Fair Value 608.6 2,730.6  
Fair Value 2,638.0 424.4  
Fair Value 3,246.6 3,155.0  
Fixed Maturities:      
Unrealized Losses (54.1) (373.9)  
Unrealized Losses (597.5) (125.8)  
Unrealized Losses (651.6) (499.7)  
Redeemable Preferred Stocks      
Fixed Maturities:      
Fair Value 0.0   $ 7.7
Fair Value 7.4   0.0
Fair Value 7.4   7.7
Fixed Maturities:      
Unrealized Losses 0.0   (1.0)
Unrealized Losses (1.3)   0.0
Unrealized Losses (1.3)   $ (1.0)
Collateralized Loan Obligations      
Fixed Maturities:      
Fair Value 21.9 568.2  
Fair Value 776.2 373.9  
Fair Value 798.1 942.1  
Fixed Maturities:      
Unrealized Losses (0.3) (34.2)  
Unrealized Losses (29.8) (26.6)  
Unrealized Losses (30.1) (60.8)  
Other Mortgage- and Asset-backed      
Fixed Maturities:      
Fair Value 25.3 205.4  
Fair Value 276.5 79.5  
Fair Value 301.8 284.9  
Fixed Maturities:      
Unrealized Losses (0.4) (28.9)  
Unrealized Losses (57.3) (21.4)  
Unrealized Losses (57.7) (50.3)  
Investments in Fixed Maturities      
Fixed Maturities:      
Fair Value 1,123.6 4,704.0  
Fair Value 4,955.9 1,283.7  
Fair Value 6,079.5 5,987.7  
Fixed Maturities:      
Unrealized Losses (80.9) (627.9)  
Unrealized Losses (1,068.1) (308.9)  
Unrealized Losses (1,149.0) (936.8)  
Investments in Fixed Maturities | Non-investment-grade      
Fixed Maturities:      
Unrealized Losses $ (28.9) $ (32.8)