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Fair Value Measurements - Transfers (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3, net derivative assets (liabilities)	$ 0.1	$ 0.1
Transfers out of Level 3 into Level 2, net derivative assets (liabilities)	0.4		$ 0.3
Available-for-sale | Fixed maturities
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3	214.6	451.9	188.3
Transfers out of Level 3 into Level 2	132.5	289.9	263.8
Available-for-sale | States and political subdivisions
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3	15.5		12.0
Transfers out of Level 3 into Level 2	17.9		10.2
Available-for-sale | Corporate debt securities
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3	58.9	212.4	176.3
Transfers out of Level 3 into Level 2		77.2	35.2
Available-for-sale | Commercial mortgage-backed securities
Fair Value Hierarchy Levels Transfers
Transfers out of Level 3 into Level 2			10.2
Available-for-sale | Collateralized debt obligations
Fair Value Hierarchy Levels Transfers
Transfers out of Level 3 into Level 2	3.0	148.5	180.4
Available-for-sale | Other debt obligations
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3	140.2	239.5
Transfers out of Level 3 into Level 2	$ 111.6	$ 64.2	27.8
Trading | Fixed maturities
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3			$ 29.0

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