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Investments - Continuous Unrealized Loss (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
U.S. Government and Government Agencies and Authorities    
Fixed Maturities:    
Fair Value $ 9.3 $ 41.7
Fair Value 381.1 383.6
Fair Value 390.4 425.3
Fixed Maturities:    
Unrealized Losses (0.1) (0.5)
Unrealized Losses (91.8) (101.9)
Unrealized Losses (91.9) (102.4)
States and Political Subdivisions    
Fixed Maturities:    
Fair Value 204.1 242.7
Fair Value 958.5 933.4
Fair Value 1,162.6 1,176.1
Fixed Maturities:    
Unrealized Losses (10.7) (10.3)
Unrealized Losses (212.6) (215.1)
Unrealized Losses (223.3) (225.4)
Foreign Governments    
Fixed Maturities:    
Fair Value 0.1 0.0
Fair Value 1.0 1.4
Fair Value 1.1 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 624.6 674.3
Fair Value 2,516.0 2,605.7
Fair Value 3,140.6 3,280.0
Fixed Maturities:    
Unrealized Losses (34.0) (40.9)
Unrealized Losses (444.3) (477.9)
Unrealized Losses (478.3) (518.8)
Redeemable Preferred Stocks    
Fixed Maturities:    
Fair Value 0.0 2.0
Fair Value 1.9 6.6
Fair Value 1.9 8.6
Fixed Maturities:    
Unrealized Losses 0.0 0.0
Unrealized Losses (0.1) (1.0)
Unrealized Losses (0.1) (1.0)
Collateralized Loan Obligations    
Fixed Maturities:    
Fair Value 180.7 34.2
Fair Value 75.3 89.5
Fair Value 256.0 123.7
Fixed Maturities:    
Unrealized Losses (0.7) (0.1)
Unrealized Losses (6.9) (7.1)
Unrealized Losses (7.6) (7.2)
Other Mortgage- and Asset-backed    
Fixed Maturities:    
Fair Value 9.8 12.0
Fair Value 252.8 261.7
Fair Value 262.6 273.7
Fixed Maturities:    
Unrealized Losses (0.2) (0.1)
Unrealized Losses (27.1) (34.4)
Unrealized Losses (27.3) (34.5)
Investments in Fixed Maturities    
Fixed Maturities:    
Fair Value 1,028.6 1,006.9
Fair Value 4,186.6 4,281.9
Fair Value 5,215.2 5,288.8
Fixed Maturities:    
Unrealized Losses (45.7) (51.9)
Unrealized Losses (783.0) (837.6)
Unrealized Losses $ (828.7) $ (889.5)