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Investments - Continuous Unrealized Loss (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
U.S. Government and Government Agencies and Authorities      
Fixed Maturities:      
Fair Value $ 46.5 $ 52.0  
Fair Value 393.0 401.6  
Fair Value 439.5 453.6  
Fixed Maturities:      
Unrealized Losses (1.6) (0.8)  
Unrealized Losses (93.3) (83.7)  
Unrealized Losses (94.9) (84.5)  
States and Political Subdivisions      
Fixed Maturities:      
Fair Value 165.0 112.9  
Fair Value 962.0 928.3  
Fair Value 1,127.0 1,041.2  
Fixed Maturities:      
Unrealized Losses (3.3) (2.3)  
Unrealized Losses (202.5) (187.5)  
Unrealized Losses (205.8) (189.8)  
Foreign Governments      
Fixed Maturities:      
Fair Value 0.9 0.0  
Fair Value 1.7 1.9  
Fair Value 2.6 1.9  
Fixed Maturities:      
Unrealized Losses 0.0 0.0  
Unrealized Losses (0.6) (0.6)  
Unrealized Losses (0.6) (0.6)  
Corporate Debt Securities [Member]      
Fixed Maturities:      
Fair Value 432.3 198.4  
Fair Value 2,801.7 2,813.0  
Fair Value 3,234.0 3,011.4  
Fixed Maturities:      
Unrealized Losses (11.5) (5.5)  
Unrealized Losses (436.5) (378.3)  
Unrealized Losses (448.0) (383.8)  
Mandatorily Redeemable Preferred Stock [Member]      
Fixed Maturities:      
Fair Value 0.0   $ 0.0
Fair Value 7.6   7.9
Fair Value 7.6   7.9
Fixed Maturities:      
Unrealized Losses 0.0   0.0
Unrealized Losses (1.1)   (0.8)
Unrealized Losses (1.1)   $ (0.8)
Collateralized Loan Obligations      
Fixed Maturities:      
Fair Value 231.6 38.8  
Fair Value 246.7 747.7  
Fair Value 478.3 786.5  
Fixed Maturities:      
Unrealized Losses (0.8) (0.4)  
Unrealized Losses (14.6) (24.1)  
Unrealized Losses (15.4) (24.5)  
Other Mortgage- and Asset-backed      
Fixed Maturities:      
Fair Value 14.9 15.7  
Fair Value 292.5 287.3  
Fair Value 307.4 303.0  
Fixed Maturities:      
Unrealized Losses (0.1) (0.1)  
Unrealized Losses (42.2) (46.2)  
Unrealized Losses (42.3) (46.3)  
Investments in Fixed Maturities      
Fixed Maturities:      
Fair Value 891.2 417.8  
Fair Value 4,705.2 5,187.7  
Fair Value 5,596.4 5,605.5  
Fixed Maturities:      
Unrealized Losses (17.3) (9.1)  
Unrealized Losses (790.8) (721.2)  
Unrealized Losses (808.1) (730.3)  
Investments in Fixed Maturities | Non-investment-grade      
Fixed Maturities:      
Unrealized Losses $ (19.4) $ (25.5)