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Market Risk Benefits - Asset and Liability Position and Reconciliation (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Market Risk Benefits
Market risk benefit asset	$ 187.5	$ 199.5
Market risk benefit liability	69.1	62.1
Net asset (liability)	118.4	137.4
Retirement and Income Solutions | Individual variable annuities
Market Risk Benefits
Market risk benefit asset	187.5	199.5
Market risk benefit liability	69.1	62.1
Net asset (liability)	$ 118.4	$ 137.4	$ 41.5

X

- Definition

Amount, before effect of reinsurance and after accumulated increase (decrease) in instrument-specific credit risk, of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk.

+ References

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Amount of asset position for contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk.

+ References

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Amount of liability position for contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk.

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