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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, 2024	Dec. 31, 2023	Dec. 31, 2022
Future Policy Benefits and Claims
Gross premiums or assessments	$ 5,212.2	$ 4,938.7	$ 3,864.3
Interest accretion	2,093.1	1,975.0	2,142.5
Retirement and Income Solutions
Future Policy Benefits and Claims
Gross premiums or assessments	3,149.7	2,948.4	1,971.1
Interest accretion	1,343.5	1,227.7	1,165.4
Retirement and Income Solutions | Pension risk transfer
Future Policy Benefits and Claims
Gross premiums or assessments	3,103.1	2,905.9	1,941.0
Interest accretion	1,135.1	1,008.6	935.7
Retirement and Income Solutions | Individual fixed income annuities
Future Policy Benefits and Claims
Gross premiums or assessments	46.6	42.5	30.1
Interest accretion	208.4	219.1	229.7
Principal Asset Management | International Pension | Latin America | Individual fixed income annuities
Future Policy Benefits and Claims
Gross premiums or assessments	29.0	29.7	78.8
Interest accretion	330.2	385.8	662.0
Benefits and Protection
Future Policy Benefits and Claims
Gross premiums or assessments	2,028.6	1,955.5	1,809.2
Interest accretion	410.1	351.9	305.3
Benefits and Protection | Specialty Benefits | Individual disability
Future Policy Benefits and Claims
Gross premiums or assessments	640.0	624.6	601.0
Interest accretion	99.8	94.5	90.2
Benefits and Protection | Life Insurance | Universal life
Future Policy Benefits and Claims
Gross premiums or assessments	715.3	681.8	577.7
Interest accretion	253.3	209.2	171.2
Benefits and Protection | Life Insurance | Term life
Future Policy Benefits and Claims
Gross premiums or assessments	673.3	649.1	630.5
Interest accretion	57.0	48.2	43.9
Corporate | Long-term care insurance
Future Policy Benefits and Claims
Gross premiums or assessments	4.9	5.1	5.2
Interest accretion	$ 9.3	$ 9.6	$ 9.8

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