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Separate Account Balances - Separate Account Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Separate Account Balances
Separate account liabilities	$ 167,605.6	$ 155,375.1
Other balances
Separate Account Balances
Separate account liabilities	247.9	233.3
Retirement and Income Solutions
Separate Account Balances
Separate account liabilities	126,650.4	115,899.1
Retirement and Income Solutions | Group retirement contracts
Separate Account Balances
Separate account liabilities	117,518.5	107,240.1	$ 131,188.6
Retirement and Income Solutions | Individual variable annuities
Separate Account Balances
Separate account liabilities	9,131.9	8,659.0	11,000.0
Principal Asset Management | Principal International
Separate Account Balances
Separate account liabilities	34,724.8	34,231.7
Principal Asset Management | Principal International | Pension | Latin America
Separate Account Balances
Separate account liabilities	34,580.6	33,316.7	33,030.6
Principal Asset Management | Principal International | Guaranteed pension | Asia
Separate Account Balances
Separate account liabilities	144.2	915.0	971.3
Benefits and Protection | Life Insurance | Universal life
Separate Account Balances
Separate account liabilities	$ 5,982.5	$ 5,011.0	$ 5,886.1

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