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Investments - Aging of Unrealized Losses on Investments in Fixed Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Unrealized Losses    
12 Months or Longer   $ 0.0
United States Government and Government Agencies and Authorities    
Fair Value    
Less Than 12 Months $ 52.0 337.3
12 Months or Longer 401.6 126.5
Total 453.6 463.8
Unrealized Losses    
Less Than 12 Months (0.8) (49.3)
12 Months or Longer (83.7) (36.5)
Total (84.5) (85.8)
States and Political Subdivisions    
Fair Value    
Less Than 12 Months 112.9 854.7
12 Months or Longer 928.3 276.8
Total 1,041.2 1,131.5
Unrealized Losses    
Less Than 12 Months (2.3) (140.6)
12 Months or Longer (187.5) (97.7)
Total (189.8) (238.3)
Debt Security, Government, Non-US [Member]    
Fair Value    
Less Than 12 Months 0.0 0.1
12 Months or Longer 1.9 2.6
Total 1.9 2.7
Unrealized Losses    
Less Than 12 Months 0.0 0.0
12 Months or Longer (0.6) (0.9)
Total (0.6) (0.9)
Corporate Debt Securities [Member]    
Fair Value    
Less Than 12 Months 198.4 2,730.6
12 Months or Longer 2,813.0 424.4
Total 3,011.4 3,155.0
Unrealized Losses    
Less Than 12 Months (5.5) (373.9)
12 Months or Longer (378.3) (125.8)
Total (383.8) (499.7)
Redeemable Preferred Stocks    
Fair Value    
Less Than 12 Months 0.0 7.7
12 Months or Longer 7.9 0.0
Total 7.9 7.7
Unrealized Losses    
Less Than 12 Months 0.0 (1.0)
12 Months or Longer (0.8)  
Total (0.8) (1.0)
Collateralized Loan Obligations    
Fair Value    
Less Than 12 Months 38.8 568.2
12 Months or Longer 747.7 373.9
Total 786.5 942.1
Unrealized Losses    
Less Than 12 Months (0.4) (34.2)
12 Months or Longer (24.1) (26.6)
Total (24.5) (60.8)
Other Mortgage- and Asset-backed    
Fair Value    
Less Than 12 Months 15.7 205.4
12 Months or Longer 287.3 79.5
Total 303.0 284.9
Unrealized Losses    
Less Than 12 Months (0.1) (28.9)
12 Months or Longer (46.2) (21.4)
Total (46.3) (50.3)
Investments in Fixed Maturities    
Fair Value    
Less Than 12 Months 417.8 4,704.0
12 Months or Longer 5,187.7 1,283.7
Total 5,605.5 5,987.7
Unrealized Losses    
Less Than 12 Months (9.1) (627.9)
12 Months or Longer (721.2) (308.9)
Total $ (730.3) $ (936.8)