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Investments - Continuous Unrealized Loss (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
U.S. Government and Government Agencies and Authorities    
Fixed Maturities:    
Fair Value $ 3.2 $ 41.7
Fair Value 382.4 383.6
Fair Value 385.6 425.3
Fixed Maturities:    
Unrealized Losses 0.0 (0.5)
Unrealized Losses (84.7) (101.9)
Unrealized Losses (84.7) (102.4)
States and Political Subdivisions    
Fixed Maturities:    
Fair Value 178.5 242.7
Fair Value 971.5 933.4
Fair Value 1,150.0 1,176.1
Fixed Maturities:    
Unrealized Losses (6.6) (10.3)
Unrealized Losses (187.9) (215.1)
Unrealized Losses (194.5) (225.4)
Foreign Governments    
Fixed Maturities:    
Fair Value 3.7 0.0
Fair Value 0.4 1.4
Fair Value 4.1 1.4
Fixed Maturities:    
Unrealized Losses (0.1) 0.0
Unrealized Losses (0.2) (0.2)
Unrealized Losses (0.3) (0.2)
Corporate Bonds and Notes    
Fixed Maturities:    
Fair Value 538.0 674.3
Fair Value 2,472.6 2,605.7
Fair Value 3,010.6 3,280.0
Fixed Maturities:    
Unrealized Losses (21.3) (40.9)
Unrealized Losses (395.9) (477.9)
Unrealized Losses (417.2) (518.8)
Redeemable Preferred Stocks    
Fixed Maturities:    
Fair Value 0.0 2.0
Fair Value 2.0 6.6
Fair Value 2.0 8.6
Fixed Maturities:    
Unrealized Losses 0.0 0.0
Unrealized Losses 0.0 (1.0)
Unrealized Losses 0.0 (1.0)
Collateralized Loan Obligations    
Fixed Maturities:    
Fair Value 57.0 34.2
Fair Value 68.8 89.5
Fair Value 125.8 123.7
Fixed Maturities:    
Unrealized Losses (0.5) (0.1)
Unrealized Losses (6.0) (7.1)
Unrealized Losses (6.5) (7.2)
Other Mortgage- and Asset-backed    
Fixed Maturities:    
Fair Value 13.4 12.0
Fair Value 247.6 261.7
Fair Value 261.0 273.7
Fixed Maturities:    
Unrealized Losses 0.0 (0.1)
Unrealized Losses (24.8) (34.4)
Unrealized Losses (24.8) (34.5)
Investments in Fixed Maturities    
Fixed Maturities:    
Fair Value 793.8 1,006.9
Fair Value 4,145.3 4,281.9
Fair Value 4,939.1 5,288.8
Fixed Maturities:    
Unrealized Losses (28.5) (51.9)
Unrealized Losses (699.5) (837.6)
Unrealized Losses $ (728.0) $ (889.5)