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Separate Account Balances - Separate Account Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Separate Account Balances
Separate account liabilities	$ 173,327.1	$ 167,605.6
Other balances
Separate Account Balances
Separate account liabilities	280.2	247.9
Retirement and Income Solutions
Separate Account Balances
Separate account liabilities	133,438.0	126,650.4
Retirement and Income Solutions | Group retirement contracts
Separate Account Balances
Separate account liabilities	125,103.1	117,518.5	$ 107,240.1
Retirement and Income Solutions | Individual variable annuities
Separate Account Balances
Separate account liabilities	8,334.9	9,131.9	8,659.0
Principal Asset Management | International Pension
Separate Account Balances
Separate account liabilities	32,802.2	34,724.8
Principal Asset Management | International Pension | Pension | Latin America
Separate Account Balances
Separate account liabilities	32,802.2	34,580.6	33,316.7
Principal Asset Management | International Pension | Guaranteed pension | Asia
Separate Account Balances
Separate account liabilities		144.2	915.0
Benefits and Protection | Life Insurance | Universal life
Separate Account Balances
Separate account liabilities	$ 6,806.7	$ 5,982.5	$ 5,011.0

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