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Investments - Continuous Unrealized Loss (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
U.S. Government and Government Agencies and Authorities    
Fixed Maturities:    
Fair Value $ 0.2 $ 52.0
Fair Value 413.3 401.6
Fair Value 413.5 453.6
Fixed Maturities:    
Unrealized Losses 0.0 (0.8)
Unrealized Losses (78.3) (83.7)
Unrealized Losses (78.3) (84.5)
States and Political Subdivisions    
Fixed Maturities:    
Fair Value 43.1 112.9
Fair Value 996.5 928.3
Fair Value 1,039.6 1,041.2
Fixed Maturities:    
Unrealized Losses (0.6) (2.3)
Unrealized Losses (173.2) (187.5)
Unrealized Losses (173.8) (189.8)
Foreign Governments    
Fixed Maturities:    
Fair Value 0.0 0.0
Fair Value 1.7 1.9
Fair Value 1.7 1.9
Fixed Maturities:    
Unrealized Losses 0.0 0.0
Unrealized Losses (0.4) (0.6)
Unrealized Losses (0.4) (0.6)
Corporate Bonds and Notes    
Fixed Maturities:    
Fair Value 98.2 198.4
Fair Value 2,785.8 2,813.0
Fair Value 2,884.0 3,011.4
Fixed Maturities:    
Unrealized Losses (2.2) (5.5)
Unrealized Losses (338.9) (378.3)
Unrealized Losses (341.1) (383.8)
Redeemable Preferred Stocks    
Fixed Maturities:    
Fair Value 1.2 0.0
Fair Value 6.7 7.9
Fair Value 7.9 7.9
Fixed Maturities:    
Unrealized Losses 0.0 0.0
Unrealized Losses (0.8) (0.8)
Unrealized Losses (0.8) (0.8)
Collateralized Loan Obligations    
Fixed Maturities:    
Fair Value 56.0 38.8
Fair Value 100.9 747.7
Fair Value 156.9 786.5
Fixed Maturities:    
Unrealized Losses (0.3) (0.4)
Unrealized Losses (8.0) (24.1)
Unrealized Losses (8.3) (24.5)
Other Mortgage- and Asset-backed    
Fixed Maturities:    
Fair Value 21.2 15.7
Fair Value 273.2 287.3
Fair Value 294.4 303.0
Fixed Maturities:    
Unrealized Losses (0.1) (0.1)
Unrealized Losses (29.9) (46.2)
Unrealized Losses (30.0) (46.3)
Investments in Fixed Maturities    
Fixed Maturities:    
Fair Value 219.9 417.8
Fair Value 4,578.1 5,187.7
Fair Value 4,798.0 5,605.5
Fixed Maturities:    
Unrealized Losses (3.2) (9.1)
Unrealized Losses (629.5) (721.2)
Unrealized Losses $ (632.7) $ (730.3)