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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)

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