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Fair Value Measurements - Transfers (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions	3 Months Ended
	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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