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Investments - Aging of Unrealized Losses on Investments in Fixed Maturities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
United States Government and Government Agencies and Authorities |  |
Fair Value |  |
Less Than 12 Months | $ 118.5 | $ 401.1
12 Months or Longer | 5.1 | 79.0
Total | 123.6 | 480.1
Unrealized Losses |  |
Less Than 12 Months | (1.3) | (7.6)
12 Months or Longer | 0.0 | (7.4)
Total | (1.3) | (15.0)
States and Political Subdivisions |  |
Fair Value |  |
Less Than 12 Months | 63.0 | 299.4
12 Months or Longer | 5.4 | 102.6
Total | 68.4 | 402.0
Unrealized Losses |  |
Less Than 12 Months | (0.7) | (5.0)
12 Months or Longer | (0.4) | (3.6)
Total | (1.1) | (8.6)
Foreign Governments |  |
Fair Value |  |
Less Than 12 Months | 1.0 | 4.9
12 Months or Longer | 3.1 | 0.0
Total | 4.1 | 4.9
Unrealized Losses |  |
Less Than 12 Months | (0.3) | (0.6)
12 Months or Longer | (1.3) | 0.0
Total | (1.6) | (0.6)
Corporate Bonds and Notes |  |
Fair Value |  |
Less Than 12 Months | 160.0 | 1,326.0
12 Months or Longer | 70.7 | 116.8
Total | 230.7 | 1,442.8
Unrealized Losses |  |
Less Than 12 Months | (2.1) | (38.2)
12 Months or Longer | (5.0) | (10.9)
Total | (7.1) | (49.1)
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 | 95.5 | 439.2
12 Months or Longer | 355.6 | 0.0
Total | 451.1 | 439.2
Unrealized Losses |  |
Less Than 12 Months | (1.9) | (13.2)
12 Months or Longer | (6.6) | 0.0
Total | (8.5) | (13.2)
Other Mortgage- and Asset-backed |  |
Fair Value |  |
Less Than 12 Months | 72.8 | 0.2
12 Months or Longer | 0.0 | 4.5
Total | 72.8 | 4.7
Unrealized Losses |  |
Less Than 12 Months | (1.1) | 0.0
12 Months or Longer | 0.0 | (0.1)
Total | (1.1) | (0.1)
Investments in Fixed Maturities |  |
Fair Value |  |
Less Than 12 Months | 516.3 | 2,470.8
12 Months or Longer | 439.9 | 302.9
Total | 956.2 | 2,773.7
Unrealized Losses |  |
Less Than 12 Months | (7.5) | (64.6)
12 Months or Longer | (13.3) | (22.0)
Total | $ (20.8) | $ (86.6)

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