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Fair Value Measurements - Transfers (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3, net derivative assets (liabilities) |  | $ (0.1) |  | $ (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 |  | 4.6 | 121.5 | 214.6
Transfers out of Level 3 into Level 2 | $ 94.2 | 17.9 | 119.0 | 129.5
Available-for-sale | States and political subdivisions |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 |  |  |  | 15.5
Transfers out of Level 3 into Level 2 |  | 17.9 |  | 17.9
Available-for-sale | Corporate |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 |  |  |  | 58.9
Available-for-sale | Other debt obligations |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 |  | $ 4.6 | 121.5 | 140.2
Transfers out of Level 3 into Level 2 | $ 94.2 |  | $ 119.0 | $ 111.6

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