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Investments - Aging of Unrealized Losses on Investments in Fixed Maturities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
United States Government and Government Agencies and Authorities |  |
Fair Value |  |
Less Than 12 Months | $ 168.7 | $ 10.5
12 Months or Longer | 1.2 | 0.0
Total | 169.9 | 10.5
Unrealized Losses |  |
Less Than 12 Months | (1.8) | (0.1)
12 Months or Longer | (0.1) | 0.0
Total | (1.9) | (0.1)
States and Political Subdivisions |  |
Fair Value |  |
Less Than 12 Months | 385.0 | 23.3
12 Months or Longer | 1.5 | 0.0
Total | 386.5 | 23.3
Unrealized Losses |  |
Less Than 12 Months | (6.9) | (0.2)
12 Months or Longer | (0.1) | 0.0
Total | (7.0) | (0.2)
Foreign Governments |  |
Fair Value |  |
Less Than 12 Months | 2.2 | 0.5
12 Months or Longer | 2.6 | 2.6
Total | 4.8 | 3.1
Unrealized Losses |  |
Less Than 12 Months | (0.6) | (0.1)
12 Months or Longer | (0.6) | (1.0)
Total | (1.2) | (1.1)
Corporate Bonds and Notes |  |
Fair Value |  |
Less Than 12 Months | 596.8 | 132.9
12 Months or Longer | 49.3 | 46.1
Total | 646.1 | 179.0
Unrealized Losses |  |
Less Than 12 Months | (13.1) | (7.5)
12 Months or Longer | (2.9) | (3.1)
Total | (16.0) | (10.6)
Redeemable Preferred Stocks |  |
Fair Value |  |
Less Than 12 Months | 0.1 |
12 Months or Longer | 0.0 |
Total | 0.1 |
Unrealized Losses |  |
Less Than 12 Months | 0.0 |
12 Months or Longer | 0.0 |
Total | 0.0 |
Collateralized Loan Obligations |  |
Fair Value |  |
Less Than 12 Months | 250.9 | 145.2
12 Months or Longer | 192.6 | 371.4
Total | 443.5 | 516.6
Unrealized Losses |  |
Less Than 12 Months | (2.6) | (3.8)
12 Months or Longer | (2.2) | (15.9)
Total | (4.8) | (19.7)
Other Mortgage- and Asset-backed |  |
Fair Value |  |
Less Than 12 Months | 100.1 | 6.3
12 Months or Longer | 0.0 | 0.0
Total | 100.1 | 6.3
Unrealized Losses |  |
Less Than 12 Months | (1.8) | 0.0
12 Months or Longer | 0.0 | 0.0
Total | (1.8) | 0.0
Investments in Fixed Maturities |  |
Fair Value |  |
Less Than 12 Months | 1,503.8 | 318.7
12 Months or Longer | 247.2 | 420.1
Total | 1,751.0 | 738.8
Unrealized Losses |  |
Less Than 12 Months | (26.8) | (11.7)
12 Months or Longer | (5.9) | (20.0)
Total | $ (32.7) | $ (31.7)

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