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Investments - Continuous Unrealized Loss (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
U.S. Government and Government Agencies and Authorities |  |
Fair Value |  |
Less Than 12 Months | $ 19.2 | $ 10.5
12 Months or Longer | 0.0 | 0.0
Total | 19.2 | 10.5
Unrealized Losses |  |
Less Than 12 Months | (0.6) | (0.1)
12 Months or Longer | 0.0 | 0.0
Total | (0.6) | (0.1)
States and Political Subdivisions |  |
Fair Value |  |
Less Than 12 Months | 170.4 | 23.3
12 Months or Longer | 3.4 | 0.0
Total | 173.8 | 23.3
Unrealized Losses |  |
Less Than 12 Months | (2.2) | (0.2)
12 Months or Longer | (0.1) | 0.0
Total | (2.3) | (0.2)
Foreign Governments |  |
Fair Value |  |
Less Than 12 Months | 0.2 | 0.5
12 Months or Longer | 2.8 | 2.6
Total | 3.0 | 3.1
Unrealized Losses |  |
Less Than 12 Months | (0.1) | (0.1)
12 Months or Longer | (1.1) | (1.0)
Total | (1.2) | (1.1)
Bonds and Notes |  |
Fair Value |  |
Less Than 12 Months | 337.4 | 132.9
12 Months or Longer | 17.0 | 46.1
Total | 354.4 | 179.0
Unrealized Losses |  |
Less Than 12 Months | (8.8) | (7.5)
12 Months or Longer | (1.7) | (3.1)
Total | (10.5) | (10.6)
Collateralized Loan Obligations |  |
Fair Value |  |
Less Than 12 Months | 162.6 | 145.2
12 Months or Longer | 246.8 | 371.4
Total | 409.4 | 516.6
Unrealized Losses |  |
Less Than 12 Months | (0.9) | (3.8)
12 Months or Longer | (4.4) | (15.9)
Total | (5.3) | (19.7)
Other Mortgage- and Asset-backed |  |
Fair Value |  |
Less Than 12 Months | 5.5 | 6.3
12 Months or Longer | 5.0 | 0.0
Total | 10.5 | 6.3
Unrealized Losses |  |
Less Than 12 Months | (0.1) | 0.0
12 Months or Longer | 0.0 | 0.0
Total | (0.1) | 0.0
Investments in Fixed Maturities |  |
Fair Value |  |
Less Than 12 Months | 695.3 | 318.7
12 Months or Longer | 275.0 | 420.1
Total | 970.3 | 738.8
Unrealized Losses |  |
Less Than 12 Months | (12.7) | (11.7)
12 Months or Longer | (7.3) | (20.0)
Total | (20.0) | (31.7)
Investments in Fixed Maturities | Non-investment-grade |  |
Unrealized Losses |  |
Total | $ (8.5) | $ (23.7)

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