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Fair Value Measurements - Transfers (Details) - Available-for-sale - Recurring Fair Value Measurements - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Fixed maturities
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3	$ 90.5	$ 79.1	$ 210.0	$ 307.8
Transfers out of Level 3 into Level 2		120.9	111.6	179.0
States and political subdivisions
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3	15.5		15.5
Corporate debt securities
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3	19.4	79.1	58.9	89.5
Transfers out of Level 3 into Level 2				42.9
Collateralized debt obligations
Fair Value Hierarchy Levels Transfers
Transfers out of Level 3 into Level 2		$ 120.9		136.1
Other debt obligations
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3	$ 55.6		135.6	$ 218.3
Transfers out of Level 3 into Level 2			$ 111.6

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