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Fair Value Measurements - Transfers (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 3 into Level 2, net derivative assets (liabilities) | $ 0.1 |
Available-for-sale | Fixed maturities |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 |  | $ 119.5
Transfers out of Level 3 into Level 2 | 24.8 | 111.6
Available-for-sale | Corporate |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 |  | 39.5
Available-for-sale | Other debt obligations |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 |  | 80.0
Transfers out of Level 3 into Level 2 | 24.8 | $ 111.6
Trading | Fixed maturities |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 3 into Level 2 | $ 4.8 |

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