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Investments - Continuous Unrealized Loss (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
U.S. Government and Government Agencies and Authorities |  |
Fair Value |  |
Less Than 12 Months | $ 22.0 | $ 401.1
12 Months or Longer | 5.6 | 79.0
Total | 27.6 | 480.1
Unrealized Losses |  |
Less Than 12 Months | (0.2) | (7.6)
12 Months or Longer | (0.1) | (7.4)
Total | (0.3) | (15.0)
States and Political Subdivisions |  |
Fair Value |  |
Less Than 12 Months | 22.7 | 299.4
12 Months or Longer | 6.6 | 102.6
Total | 29.3 | 402.0
Unrealized Losses |  |
Less Than 12 Months | (0.3) | (5.0)
12 Months or Longer | (0.3) | (3.6)
Total | (0.6) | (8.6)
Foreign Governments |  |
Fair Value |  |
Less Than 12 Months | 1.1 | 4.9
12 Months or Longer | 2.4 | 0.0
Total | 3.5 | 4.9
Unrealized Losses |  |
Less Than 12 Months | (0.5) | (0.6)
12 Months or Longer | (2.0) | 0.0
Total | (2.5) | (0.6)
Bonds and Notes |  |
Fair Value |  |
Less Than 12 Months | 200.5 | 1,326.0
12 Months or Longer | 71.7 | 116.8
Total | 272.2 | 1,442.8
Unrealized Losses |  |
Less Than 12 Months | (3.3) | (38.2)
12 Months or Longer | (6.5) | (10.9)
Total | (9.8) | (49.1)
Collateralized Loan Obligations |  |
Fair Value |  |
Less Than 12 Months | 353.4 | 439.2
12 Months or Longer | 87.4 | 0.0
Total | 440.8 | 439.2
Unrealized Losses |  |
Less Than 12 Months | (5.4) | (13.2)
12 Months or Longer | (3.0) | 0.0
Total | (8.4) | (13.2)
Other Mortgage- and Asset-backed |  |
Fair Value |  |
Less Than 12 Months |  | 0.2
12 Months or Longer |  | 4.5
Total |  | 4.7
Unrealized Losses |  |
Less Than 12 Months |  | 0.0
12 Months or Longer |  | (0.1)
Total |  | (0.1)
Investments in Fixed Maturities |  |
Fair Value |  |
Less Than 12 Months | 599.7 | 2,470.8
12 Months or Longer | 173.7 | 302.9
Total | 773.4 | 2,773.7
Unrealized Losses |  |
Less Than 12 Months | (9.7) | (64.6)
12 Months or Longer | (11.9) | (22.0)
Total | $ (21.6) | $ (86.6)

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