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Derivative Financial Instruments Fair Value Hedges Carrying Amount of Hedged Assets and Liabilities and Cumulative Basis Adjustments (Details) - Receive Fixed/Pay Fixed - Designated as Hedging Instrument - Fair Value Hedging - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures
Hedged Asset, Fair Value Hedge	$ 690.4	$ 551.0
Hedged Asset, Statement of Financial Position [Extensible Enumeration]	Debt Securities, Available-for-Sale	Debt Securities, Available-for-Sale
Fixed Maturity Securities
Derivative Instruments and Hedging Activities Disclosures
Hedged Asset, Fair Value Hedge, Cumulative Increase	$ 23.5	$ (46.3)
hedged asset, amortized cost	$ 792.3	$ 648.4

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Amount of asset hedged in fair value hedging relationship.

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Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk. Excludes cumulative basis adjustment related to foreign exchange risk.

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Indicates line item in statement of financial position that includes hedged asset.

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