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Separate Account Balances - Separate Account Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Separate Account Balances
Separate account liabilities	$ 189,251.5	$ 173,327.1
Other balances
Separate Account Balances
Separate account liabilities	309.3	280.2
Retirement and Income Solutions
Separate Account Balances
Separate account liabilities	142,972.7	133,438.0
Retirement and Income Solutions | Group retirement contracts
Separate Account Balances
Separate account liabilities	135,296.5	125,103.1	$ 117,518.5
Retirement and Income Solutions | Individual variable annuities
Separate Account Balances
Separate account liabilities	7,676.2	8,334.9	9,131.9
Principal Asset Management | International Pension | Pension | Latin America
Separate Account Balances
Separate account liabilities	38,300.6	32,802.2	34,580.6
Benefits and Protection | Life Insurance | Universal life
Separate Account Balances
Separate account liabilities	$ 7,668.9	$ 6,806.7	$ 5,982.5

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