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Fair Value Measurements - Transfers (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3, net derivative assets (liabilities)		$ (0.1)		$ (0.1)
Fixed maturities, trading
Fair Value Hierarchy Levels Transfers
Transfers out of Level 3 into Level 2			$ 4.8
Available-for-sale | Fixed maturities
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3		4.6	121.5	214.6
Transfers out of Level 3 into Level 2	$ 94.2	17.9	119.0	129.5
Available-for-sale | States and political subdivisions
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3				15.5
Transfers out of Level 3 into Level 2		17.9		17.9
Available-for-sale | Corporate
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3				58.9
Available-for-sale | Other debt obligations
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3		$ 4.6	121.5	140.2
Transfers out of Level 3 into Level 2	$ 94.2		$ 119.0	$ 111.6

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