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Investments - Continuous Unrealized Loss (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
U.S. Government and Government Agencies and Authorities    
Fair Value    
Less Than 12 Months $ 0.5 $ 118.5
12 Months or Longer 0.0 5.1
Total 0.5 123.6
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 28.4 63.0
12 Months or Longer 0.0 5.4
Total 28.4 68.4
Unrealized Losses    
Less Than 12 Months (1.7) (0.7)
12 Months or Longer 0.0 (0.4)
Total (1.7) (1.1)
Foreign Governments    
Fair Value    
Less Than 12 Months 2.3 1.0
12 Months or Longer 2.4 3.1
Total 4.7 4.1
Unrealized Losses    
Less Than 12 Months (0.1) (0.3)
12 Months or Longer (1.1) (1.3)
Total (1.2) (1.6)
Bonds and Notes    
Fair Value    
Less Than 12 Months 330.6 160.0
12 Months or Longer 39.3 70.7
Total 369.9 230.7
Unrealized Losses    
Less Than 12 Months (19.2) (2.1)
12 Months or Longer (3.8) (5.0)
Total (23.0) (7.1)
Redeemable Preferred Stocks    
Fair Value    
Less Than 12 Months 5.4 5.5
12 Months or Longer 0.0 0.0
Total 5.4 5.5
Unrealized Losses    
Less Than 12 Months (0.1) (0.1)
12 Months or Longer 0.0 0.0
Total (0.1) (0.1)
Collateralized Loan Obligations    
Fair Value    
Less Than 12 Months 261.8 95.5
12 Months or Longer 366.8 355.6
Total 628.6 451.1
Unrealized Losses    
Less Than 12 Months (19.6) (1.9)
12 Months or Longer (29.9) (6.6)
Total (49.5) (8.5)
Other Mortgage- and Asset-backed    
Fair Value    
Less Than 12 Months 74.1 72.8
12 Months or Longer 0.0 0.0
Total 74.1 72.8
Unrealized Losses    
Less Than 12 Months (1.3) (1.1)
12 Months or Longer 0.0 0.0
Total (1.3) (1.1)
Investments in Fixed Maturities    
Fair Value    
Less Than 12 Months 703.1 516.3
12 Months or Longer 408.5 439.9
Total 1,111.6 956.2
Unrealized Losses    
Less Than 12 Months (42.0) (7.5)
12 Months or Longer (34.8) (13.3)
Total $ (76.8) $ (20.8)