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Investments - Continuous Unrealized Loss (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
U.S. Government and Government Agencies and Authorities    
Fixed Maturities:    
Fair Value $ 17.5 $ 41.7
Fair Value 390.1 383.6
Fair Value 407.6 425.3
Fixed Maturities:    
Unrealized Losses (0.1) (0.5)
Unrealized Losses (90.8) (101.9)
Unrealized Losses (90.9) (102.4)
States and Political Subdivisions    
Fixed Maturities:    
Fair Value 200.1 242.7
Fair Value 966.6 933.4
Fair Value 1,166.7 1,176.1
Fixed Maturities:    
Unrealized Losses (7.6) (10.3)
Unrealized Losses (209.5) (215.1)
Unrealized Losses (217.1) (225.4)
Foreign Governments    
Fixed Maturities:    
Fair Value 0.3 0.0
Fair Value 1.4 1.4
Fair Value 1.7 1.4
Fixed Maturities:    
Unrealized Losses 0.0 0.0
Unrealized Losses (0.2) (0.2)
Unrealized Losses (0.2) (0.2)
Corporate Bonds and Notes    
Fixed Maturities:    
Fair Value 684.3 674.3
Fair Value 2,790.4 2,605.7
Fair Value 3,474.7 3,280.0
Fixed Maturities:    
Unrealized Losses (30.1) (40.9)
Unrealized Losses (445.9) (477.9)
Unrealized Losses (476.0) (518.8)
Redeemable Preferred Stocks    
Fixed Maturities:    
Fair Value 0.0 2.0
Fair Value 6.6 6.6
Fair Value 6.6 8.6
Fixed Maturities:    
Unrealized Losses 0.0 0.0
Unrealized Losses (0.9) (1.0)
Unrealized Losses (0.9) (1.0)
Collateralized Loan Obligations    
Fixed Maturities:    
Fair Value 175.9 34.2
Fair Value 92.2 89.5
Fair Value 268.1 123.7
Fixed Maturities:    
Unrealized Losses (0.7) (0.1)
Unrealized Losses (6.1) (7.1)
Unrealized Losses (6.8) (7.2)
Other Mortgage- and Asset-backed    
Fixed Maturities:    
Fair Value 44.0 12.0
Fair Value 268.4 261.7
Fair Value 312.4 273.7
Fixed Maturities:    
Unrealized Losses (0.2) (0.1)
Unrealized Losses (29.6) (34.4)
Unrealized Losses (29.8) (34.5)
Investments in Fixed Maturities    
Fixed Maturities:    
Fair Value 1,122.1 1,006.9
Fair Value 4,515.7 4,281.9
Fair Value 5,637.8 5,288.8
Fixed Maturities:    
Unrealized Losses (38.7) (51.9)
Unrealized Losses (783.0) (837.6)
Unrealized Losses $ (821.7) $ (889.5)