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Future Policy Benefits and Claims - Expected Future Gross Premiums and Benefit Payments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Retirement and Income Solutions | Pension risk transfer |  |
Future Policy Benefits and Claims |  |
Expected undiscounted future benefit payments | $ 36,325.5 | $ 33,691.4
Retirement and Income Solutions | Individual fixed income annuities |  |
Future Policy Benefits and Claims |  |
Expected undiscounted future benefit payments | 7,292.0 | 7,716.6
Principal Asset Management | Principal International | Latin America | Individual fixed income annuities |  |
Future Policy Benefits and Claims |  |
Expected undiscounted future benefit payments | 6,296.0 | 6,449.9
Benefits and Protection | Specialty Benefits | Individual disability |  |
Future Policy Benefits and Claims |  |
Expected discounted future gross premiums | 5,456.4 | 5,140.9
Expected undiscounted future gross premiums | 8,264.8 | 7,978.7
Expected undiscounted future benefit payments | 8,981.2 | 8,473.9
Benefits and Protection | Life Insurance | Term life |  |
Future Policy Benefits and Claims |  |
Expected discounted future gross premiums | 6,385.1 | 6,104.6
Expected undiscounted future gross premiums | 10,287.2 | 10,146.3
Expected undiscounted future benefit payments | 7,832.3 | 7,202.5
Corporate | Long-term care insurance |  |
Future Policy Benefits and Claims |  |
Expected discounted future gross premiums | 42.8 | 64.6
Expected undiscounted future gross premiums | 60.3 | 96.5
Expected undiscounted future benefit payments | $ 371.0 | $ 483.4

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