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Investments - Continuous Unrealized Loss (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
U.S. Government and Government Agencies and Authorities |  |
Fixed Maturities: |  |
Fair Value | $ 23.7 | $ 52.0
Fair Value | 404.6 | 401.6
Fair Value | 428.3 | 453.6
Fixed Maturities: |  |
Unrealized Losses | (0.2) | (0.8)
Unrealized Losses | (99.9) | (83.7)
Unrealized Losses | (100.1) | (84.5)
States and Political Subdivisions |  |
Fixed Maturities: |  |
Fair Value | 224.0 | 112.9
Fair Value | 963.9 | 928.3
Fair Value | 1,187.9 | 1,041.2
Fixed Maturities: |  |
Unrealized Losses | (5.9) | (2.3)
Unrealized Losses | (209.5) | (187.5)
Unrealized Losses | (215.4) | (189.8)
Foreign Governments |  |
Fixed Maturities: |  |
Fair Value | 0.7 | 0.0
Fair Value | 1.6 | 1.9
Fair Value | 2.3 | 1.9
Fixed Maturities: |  |
Unrealized Losses | 0.0 | 0.0
Unrealized Losses | (0.5) | (0.6)
Unrealized Losses | (0.5) | (0.6)
Corporate Bonds and Notes |  |
Fixed Maturities: |  |
Fair Value | 595.1 | 198.4
Fair Value | 2,780.8 | 2,813.0
Fair Value | 3,375.9 | 3,011.4
Fixed Maturities: |  |
Unrealized Losses | (22.9) | (5.5)
Unrealized Losses | (487.0) | (378.3)
Unrealized Losses | (509.9) | (383.8)
Redeemable Preferred Stocks |  |
Fixed Maturities: |  |
Fair Value | 3.2 | 0.0
Fair Value | 6.4 | 7.9
Fair Value | 9.6 | 7.9
Fixed Maturities: |  |
Unrealized Losses | (0.1) | 0.0
Unrealized Losses | (1.1) | (0.8)
Unrealized Losses | (1.2) | (0.8)
Collateralized Loan Obligations |  |
Fixed Maturities: |  |
Fair Value | 124.5 | 38.8
Fair Value | 158.5 | 747.7
Fair Value | 283.0 | 786.5
Fixed Maturities: |  |
Unrealized Losses | (0.2) | (0.4)
Unrealized Losses | (12.3) | (24.1)
Unrealized Losses | (12.5) | (24.5)
Other Mortgage- and Asset-backed |  |
Fixed Maturities: |  |
Fair Value | 53.9 | 15.7
Fair Value | 291.7 | 287.3
Fair Value | 345.6 | 303.0
Fixed Maturities: |  |
Unrealized Losses | (0.1) | (0.1)
Unrealized Losses | (40.7) | (46.2)
Unrealized Losses | (40.8) | (46.3)
Investments in Fixed Maturities |  |
Fixed Maturities: |  |
Fair Value | 1,025.1 | 417.8
Fair Value | 4,607.5 | 5,187.7
Fair Value | 5,632.6 | 5,605.5
Fixed Maturities: |  |
Unrealized Losses | (29.4) | (9.1)
Unrealized Losses | (851.0) | (721.2)
Unrealized Losses | $ (880.4) | $ (730.3)

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