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Fair Value Measurements - Transfers (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Fair Value Hierarchy Levels Transfers
Transfers out of Level 3 into Level 2, net derivative assets (liabilities)	$ 0.1
Available-for-sale | Fixed maturities
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3		$ 119.5
Transfers out of Level 3 into Level 2	24.8	111.6
Available-for-sale | Corporate
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3		39.5
Available-for-sale | Other debt obligations
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3		80.0
Transfers out of Level 3 into Level 2	24.8	$ 111.6
Trading | Fixed maturities
Fair Value Hierarchy Levels Transfers
Transfers out of Level 3 into Level 2	$ 4.8

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