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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, 2020 | Mar. 31, 2019
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 3 into Level 2, net derivative assets (liabilities) | $ 26.5 |
Corporate debt securities |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 | 124.7 |
Transfers out of Level 3 into Level 2 | 46.3 |
Collateralized debt obligations |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 3 into Level 2 | 147.3 |
Other investments |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 |  | $ 10.0
Separate account assets |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 3 into Level 2 |  | 0.7
Available-for-sale | Fixed maturities |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 | 170.8 |
Transfers out of Level 3 into Level 2 | 236.1 | 26.0
Available-for-sale | Other debt obligations |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 | 46.1 |
Transfers out of Level 3 into Level 2 | $ 42.5 | $ 26.0

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