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Separate Account Balances - Separate Account Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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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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