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Future Policy Benefits and Claims - Gross Premiums or Assessments and Interest Accretion (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | $ 4,938.7 | $ 3,864.3 | $ 3,832.2
Interest accretion | 1,975.0 | 2,142.5 | 1,898.1
Retirement and Income Solutions |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 2,948.4 | 1,971.1 | 1,883.6
Interest accretion | 1,227.7 | 1,165.4 | 1,157.2
Retirement and Income Solutions | Pension risk transfer |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 2,905.9 | 1,941.0 | 1,800.1
Interest accretion | 1,008.6 | 935.7 | 916.7
Retirement and Income Solutions | Individual fixed income annuities |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 42.5 | 30.1 | 83.5
Interest accretion | 219.1 | 229.7 | 240.5
Principal Asset Management | Principal International | Latin America | Individual fixed income annuities |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 29.7 | 78.8 | 128.9
Interest accretion | 385.8 | 662.0 | 444.3
Benefits and Protection |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 1,955.5 | 1,809.2 | 1,814.5
Interest accretion | 351.9 | 305.3 | 287.1
Benefits and Protection | Specialty Benefits | Individual disability |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 624.6 | 601.0 | 574.1
Interest accretion | 94.5 | 90.2 | 85.6
Benefits and Protection | Life Insurance | Universal life |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 681.8 | 577.7 | 621.0
Interest accretion | 209.2 | 171.2 | 158.3
Benefits and Protection | Life Insurance | Term life |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 649.1 | 630.5 | 619.4
Interest accretion | 48.2 | 43.9 | 43.2
Corporate | Long-term care insurance |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 5.1 | 5.2 | 5.2
Interest accretion | $ 9.6 | $ 9.8 | $ 9.5

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