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v3.23.3

Fair Value Measurements - Transfers (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3, net derivative assets (liabilities) | $ 0.1 |  | $ 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 | 103.4 |  | 411.2 | 188.3
Transfers out of Level 3 into Level 2 | 44.2 | $ 11.2 | 223.2 | 180.7
Available-for-sale | States and political subdivisions |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 |  |  |  | 12.0
Transfers out of Level 3 into Level 2 |  | 10.2 |  | 10.2
Available-for-sale | Corporate debt securities |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 | 82.2 |  | 171.7 | 176.3
Transfers out of Level 3 into Level 2 | 34.3 |  | 77.2 |
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 3 into Level 2 | 9.9 |  | 146.0 | 139.3
Available-for-sale | Other debt obligations |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 | $ 21.2 |  | $ 239.5 |
Transfers out of Level 3 into Level 2 |  | $ 1.0 |  | 21.0
Trading | Fixed maturities |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 |  |  |  | $ 29.0

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