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Separate Account Balances - Separate Account Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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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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