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Fair Value Measurements - Transfers (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 3 into Level 2, net derivative assets (liabilities) | $ 0.1 |  |  |
Fixed maturities, trading |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 3 into Level 2 |  |  | $ 4.8 |
Available-for-sale | Fixed maturities |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 | 121.5 | $ 90.5 | 121.5 | $ 210.0
Transfers out of Level 3 into Level 2 |  |  | 24.8 | 111.6
Available-for-sale | States and political subdivisions |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 |  | 15.5 |  | 15.5
Available-for-sale | Corporate |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 |  | 19.4 |  | 58.9
Available-for-sale | Other debt obligations |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 | $ 121.5 | $ 55.6 | 121.5 | 135.6
Transfers out of Level 3 into Level 2 |  |  | $ 24.8 | $ 111.6

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