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Investments - Net Unrealized Gains and Losses on Available-for-Sale Securities and Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Net Unrealized Gains and Losses on Available-for-Sale Securities and Derivative Instruments
Net unrealized gains (losses) on fixed maturities, available-for-sale	$ (4,000.4)	$ (5,942.5)
Net unrealized gains (losses) on derivative instruments	(36.9)	66.1
Adjustments for assumed changes in amortization patterns	3.9	5.1
Adjustments for assumed changes in policyholder liabilities	26.2	12.2
Net unrealized gains (losses) on other investments and noncontrolling interest adjustments	(62.4)	(52.5)
Provision for deferred income tax benefits (taxes)	877.1	1,270.5
Net unrealized gains (losses) on available-for-sale securities and derivative instruments	$ (3,192.5)	$ (4,641.1)

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- Definition

This item represents the cumulative net unrealized gains/losses adjustment related to deferred acquisition costs, sales inducements and unearned revenue reserves.

+ References

No definition available.

+ Details

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X

- Definition

This item represents the cumulative net unrealized gains/losses adjustment related to changes in policyholder benefits and claims and changes in the policyholder dividend obligation.

+ References

No definition available.

+ Details

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- Definition

The cumulative net unrealized gains/losses on fixed maturities available-for-sale, equity securities available-for-sale and derivative instruments net of adjustments related to deferred acquisition costs, sales inducements, unearned revenue reserves, changes in policyholder benefits and claims and applicable income taxes.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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- Definition

This item represents the cumulative net unrealized gains and losses on fixed maturities available-for-sale, excluding hedged portions of those in fair value hedging.

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

This item represents the cumulative net unrealized gains/losses on derivatives in qualifying cash flow hedges.

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No definition available.

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X

- Definition

This item represents the cumulative net unrealized gains/losses on other investments and net unrealized gains/losses attributable to noncontrolling interests.

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No definition available.

+ Details

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X

- Definition

This item represents the applicable deferred income tax impacts of cumulative net unrealized gains/losses on fixed maturities available-for-sale, equity securities available-for-sale and derivative instruments net of adjustments related deferred acquisition costs, sales inducements, unearned revenue reserves, and changes in policyholder benefits and claims.

+ References

No definition available.

+ Details

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