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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, 2021 | Mar. 31, 2020
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 3 into Level 2, net derivative assets (liabilities) |  | $ 26.5
Available-for-sale | Fixed maturities |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 | $ 130.6 | 170.8
Transfers out of Level 3 into Level 2 |  | 236.1
Available-for-sale | Corporate debt securities |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 | 62.2 | 124.7
Transfers out of Level 3 into Level 2 |  | 46.3
Available-for-sale | Collateralized debt obligations |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 | 47.8 |
Transfers out of Level 3 into Level 2 |  | 147.3
Available-for-sale | Other debt obligations |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 | $ 20.6 | 46.1
Transfers out of Level 3 into Level 2 |  | $ 42.5

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