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Future Policy Benefits and Claims - Gross Premiums or Assessments and Interest Accretion (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Future Policy Benefits and Claims
Gross premiums or assessments	$ 1,524.3	$ 1,116.9	$ 2,793.1	$ 2,196.1
Interest accretion	526.1	503.9	1,023.5	994.4
Retirement and Income Solutions
Future Policy Benefits and Claims
Gross premiums or assessments	1,002.3	622.9	1,772.3	1,207.9
Interest accretion	332.3	305.0	658.4	605.9
Retirement and Income Solutions | Pension risk transfer
Future Policy Benefits and Claims
Gross premiums or assessments	991.1	610.9	1,744.1	1,187.9
Interest accretion	279.7	249.9	552.6	495.1
Retirement and Income Solutions | Individual fixed income annuities
Future Policy Benefits and Claims
Gross premiums or assessments	11.2	12.0	28.2	20.0
Interest accretion	52.6	55.1	105.8	110.8
Principal Asset Management | Principal International | Latin America | Individual fixed income annuities
Future Policy Benefits and Claims
Gross premiums or assessments	10.9	8.6	13.0	15.2
Interest accretion	91.7	113.5	162.8	219.7
Benefits and Protection
Future Policy Benefits and Claims
Gross premiums or assessments	509.9	484.2	1,005.1	970.3
Interest accretion	99.8	82.8	197.8	163.7
Benefits and Protection | Specialty Benefits | Individual disability
Future Policy Benefits and Claims
Gross premiums or assessments	159.6	154.7	314.5	305.3
Interest accretion	24.6	23.5	49.0	46.7
Benefits and Protection | Life Insurance | Universal life
Future Policy Benefits and Claims
Gross premiums or assessments	180.7	167.5	356.9	342.1
Interest accretion	61.6	47.6	122.0	93.9
Benefits and Protection | Life Insurance | Term life
Future Policy Benefits and Claims
Gross premiums or assessments	169.6	162.0	333.7	322.9
Interest accretion	13.6	11.7	26.8	23.1
Corporate | Long-term care insurance
Future Policy Benefits and Claims
Gross premiums or assessments	1.2	1.2	2.7	2.7
Interest accretion	$ 2.3	$ 2.6	$ 4.5	$ 5.1

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