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Fair Value Measurements - Transfers (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 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	$ 116.6	$ 217.3	$ 247.2	388.1
Transfers out of Level 3 into Level 2	225.4	289.5	225.4	525.6
Available-for-sale | Corporate debt securities
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3	80.3	217.3	142.5	342.0
Transfers out of Level 3 into Level 2		102.6		148.9
Available-for-sale | Collateralized debt obligations
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3	36.3		84.1
Transfers out of Level 3 into Level 2	$ 225.4	167.3	225.4	314.6
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		19.6		62.1
Trading | Fixed maturities
Fair Value Hierarchy Levels Transfers
Transfers out of Level 3 into Level 2		$ 0.3		$ 0.3

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