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Future Policy Benefits and Claims - Gross Premiums or Assessments and Interest Accretion (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Future Policy Benefits and Claims
Gross premiums or assessments	$ 1,323.7	$ 1,268.8
Interest accretion	551.8	497.4
Retirement and Income Solutions
Future Policy Benefits and Claims
Gross premiums or assessments	814.3	770.0
Interest accretion	350.8	326.1
Retirement and Income Solutions | Pension risk transfer
Future Policy Benefits and Claims
Gross premiums or assessments	806.1	753.0
Interest accretion	300.5	272.9
Retirement and Income Solutions | Individual fixed income annuities
Future Policy Benefits and Claims
Gross premiums or assessments	8.2	17.0
Interest accretion	50.3	53.2
Principal Asset Management | International Pension | Latin America | Individual fixed income annuities
Future Policy Benefits and Claims
Gross premiums or assessments	1.8	2.1
Interest accretion	88.8	71.1
Benefits and Protection
Future Policy Benefits and Claims
Gross premiums or assessments	505.9	495.2
Interest accretion	109.8	98.0
Benefits and Protection | Specialty Benefits | Individual disability
Future Policy Benefits and Claims
Gross premiums or assessments	158.6	154.9
Interest accretion	25.8	24.4
Benefits and Protection | Life Insurance | Universal life
Future Policy Benefits and Claims
Gross premiums or assessments	177.0	176.2
Interest accretion	68.5	60.4
Benefits and Protection | Life Insurance | Term life
Future Policy Benefits and Claims
Gross premiums or assessments	170.3	164.1
Interest accretion	15.5	13.2
Corporate | Long-term care insurance
Future Policy Benefits and Claims
Gross premiums or assessments	1.7	1.5
Interest accretion	$ 2.4	$ 2.2

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