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Investments - Continuous Unrealized Loss (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
U.S. Government and Government Agencies and Authorities    
Fair Value    
Less Than 12 Months $ 2.3 $ 118.5
12 Months or Longer 0.0 5.1
Total 2.3 123.6
Unrealized Losses    
Less Than 12 Months 0.0 (1.3)
12 Months or Longer 0.0 0.0
Total 0.0 (1.3)
States and Political Subdivisions    
Fair Value    
Less Than 12 Months 28.5 63.0
12 Months or Longer 0.0 5.4
Total 28.5 68.4
Unrealized Losses    
Less Than 12 Months (1.6) (0.7)
12 Months or Longer 0.0 (0.4)
Total (1.6) (1.1)
Foreign Governments    
Fair Value    
Less Than 12 Months 2.5 1.0
12 Months or Longer 2.4 3.1
Total 4.9 4.1
Unrealized Losses    
Less Than 12 Months (0.2) (0.3)
12 Months or Longer (1.0) (1.3)
Total (1.2) (1.6)
Bonds and Notes    
Fair Value    
Less Than 12 Months 336.2 160.0
12 Months or Longer 24.7 70.7
Total 360.9 230.7
Unrealized Losses    
Less Than 12 Months (15.5) (2.1)
12 Months or Longer (3.0) (5.0)
Total (18.5) (7.1)
Redeemable Preferred Stocks    
Fair Value    
Less Than 12 Months   5.5
12 Months or Longer   0.0
Total   5.5
Unrealized Losses    
Less Than 12 Months   (0.1)
12 Months or Longer   0.0
Total   (0.1)
Collateralized Loan Obligations    
Fair Value    
Less Than 12 Months 276.4 95.5
12 Months or Longer 321.0 355.6
Total 597.4 451.1
Unrealized Losses    
Less Than 12 Months (11.6) (1.9)
12 Months or Longer (22.3) (6.6)
Total (33.9) (8.5)
Other Mortgage- and Asset-backed    
Fair Value    
Less Than 12 Months 1.4 72.8
12 Months or Longer 0.0 0.0
Total 1.4 72.8
Unrealized Losses    
Less Than 12 Months 0.0 (1.1)
12 Months or Longer 0.0 0.0
Total 0.0 (1.1)
Investments in Fixed Maturities    
Fair Value    
Less Than 12 Months 647.3 516.3
12 Months or Longer 348.1 439.9
Total 995.4 956.2
Unrealized Losses    
Less Than 12 Months (28.9) (7.5)
12 Months or Longer (26.3) (13.3)
Total $ (55.2) $ (20.8)