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Fair Value Measurements - Transfers (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value Hierarchy Levels Transfers |  |  |
Transfers out of Level 2 into Level 3, net derivative assets (liabilities) | $ 0.1 |  |
Transfers out of Level 3 into Level 2, net derivative assets (liabilities) |  | $ 0.3 |
Available-for-sale | Fixed maturities |  |  |
Fair Value Hierarchy Levels Transfers |  |  |
Transfers out of Level 2 into Level 3 | 451.9 | 188.3 | $ 352.9
Transfers out of Level 3 into Level 2 | 289.9 | 263.8 | 460.8
Available-for-sale | States and political subdivisions |  |  |
Fair Value Hierarchy Levels Transfers |  |  |
Transfers out of Level 2 into Level 3 |  | 12.0 | 82.4
Transfers out of Level 3 into Level 2 |  | 10.2 |
Available-for-sale | Corporate debt securities |  |  |
Fair Value Hierarchy Levels Transfers |  |  |
Transfers out of Level 2 into Level 3 | 212.4 | 176.3 | 175.8
Transfers out of Level 3 into Level 2 | 77.2 | 35.2 |
Available-for-sale | Commercial mortgage-backed securities |  |  |
Fair Value Hierarchy Levels Transfers |  |  |
Transfers out of Level 3 into Level 2 |  | 10.2 |
Available-for-sale | Collateralized debt obligations |  |  |
Fair Value Hierarchy Levels Transfers |  |  |
Transfers out of Level 2 into Level 3 |  |  | 74.1
Transfers out of Level 3 into Level 2 | 148.5 | 180.4 | 435.8
Available-for-sale | Other debt obligations |  |  |
Fair Value Hierarchy Levels Transfers |  |  |
Transfers out of Level 2 into Level 3 | 239.5 |  | 20.6
Transfers out of Level 3 into Level 2 | $ 64.2 | 27.8 | $ 25.0
Trading | Fixed maturities |  |  |
Fair Value Hierarchy Levels Transfers |  |  |
Transfers out of Level 2 into Level 3 |  | $ 29.0 |

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