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Separate Account Balances - Separate Account Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Separate Account Balances |  |  |
Separate account liabilities | $ 171,399.8 | $ 167,605.6 |
Other balances |  |  |
Separate Account Balances |  |  |
Separate account liabilities | 280.1 | 247.9 |
Retirement and Income Solutions |  |  |
Separate Account Balances |  |  |
Separate account liabilities | 131,771.5 | 126,650.4 |
Retirement and Income Solutions | Group retirement contracts |  |  |
Separate Account Balances |  |  |
Separate account liabilities | 122,733.7 | 117,518.5 | $ 107,240.1
Retirement and Income Solutions | Individual variable annuities |  |  |
Separate Account Balances |  |  |
Separate account liabilities | 9,037.8 | 9,131.9 | 8,659.0
Principal Asset Management | Principal International |  |  |
Separate Account Balances |  |  |
Separate account liabilities | 32,849.7 | 34,724.8 |
Principal Asset Management | Principal International | Pension | Latin America |  |  |
Separate Account Balances |  |  |
Separate account liabilities | 32,849.7 | 34,580.6 | 33,316.7
Principal Asset Management | Principal International | 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 | $ 6,498.5 | $ 5,982.5 | $ 5,011.0

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