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Future Policy Benefits and Claims - Expected Future Gross Premiums and Benefit Payments (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Retirement and Income Solutions | Pension risk transfer |  |
Future Policy Benefits and Claims |  |
Expected undiscounted future benefit payments | $ 41,156.6 | $ 39,532.3
Retirement and Income Solutions | Individual fixed income annuities |  |
Future Policy Benefits and Claims |  |
Expected undiscounted future benefit payments | 6,318.1 | 6,622.6
Principal Asset Management | International Pension | Latin America | Individual fixed income annuities |  |
Future Policy Benefits and Claims |  |
Expected undiscounted future benefit payments | 5,620.3 | 5,509.1
Benefits and Protection | Specialty Benefits | Individual disability |  |
Future Policy Benefits and Claims |  |
Expected discounted future gross premiums | 5,693.7 | 5,484.0
Expected undiscounted future gross premiums | 8,755.0 | 8,680.0
Expected undiscounted future benefit payments | 9,936.1 | 9,808.8
Benefits and Protection | Life Insurance | Term life |  |
Future Policy Benefits and Claims |  |
Expected discounted future gross premiums | 6,927.4 | 6,651.2
Expected undiscounted future gross premiums | 11,882.3 | 11,391.4
Expected undiscounted future benefit payments | 9,604.1 | 8,970.7
Corporate | Long-term care insurance |  |
Future Policy Benefits and Claims |  |
Expected discounted future gross premiums | 37.1 | 38.4
Expected undiscounted future gross premiums | 52.1 | 55.7
Expected undiscounted future benefit payments | $ 364.8 | $ 357.3

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