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Market Risk Benefits - Asset and Liability Position and Reconciliation (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Market Risk Benefits
Market risk benefit asset	$ 199.5	$ 153.4
Market risk benefit liability	62.1	133.2
Net asset (liability)	137.4	20.2
Retirement and Income Solutions
Market Risk Benefits
Market risk benefit asset	199.5	153.4
Market risk benefit liability	62.1	111.9
Retirement and Income Solutions | Individual variable annuities
Market Risk Benefits
Market risk benefit asset	199.5	153.4
Market risk benefit liability	62.1	111.9
Net asset (liability)	$ 137.4	41.5	$ (72.2)
Principal Asset Management
Market Risk Benefits
Market risk benefit liability		21.3
Principal Asset Management | International Pension | Guaranteed pension | Asia
Market Risk Benefits
Market risk benefit liability		21.3
Net asset (liability)		$ (21.3)	$ (26.0)

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- 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.

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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.

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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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