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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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Future Policy Benefits and Claims
Gross premiums or assessments	$ 1,116.9	$ 929.5	$ 2,196.1	$ 1,508.8
Interest accretion	503.9	578.0	994.4	1,086.3
Retirement and Income Solutions
Future Policy Benefits and Claims
Gross premiums or assessments	622.9	473.8	1,207.9	597.1
Interest accretion	305.0	289.0	605.9	580.2
Retirement and Income Solutions | Pension risk transfer
Future Policy Benefits and Claims
Gross premiums or assessments	610.9	466.3	1,187.9	582.8
Interest accretion	249.9	231.2	495.1	463.9
Retirement and Income Solutions | Individual fixed income annuities
Future Policy Benefits and Claims
Gross premiums or assessments	12.0	7.5	20.0	14.3
Interest accretion	55.1	57.8	110.8	116.3
Principal Asset Management | Principal International | Latin America | Individual fixed income annuities
Future Policy Benefits and Claims
Gross premiums or assessments	8.6	30.5	15.2	41.0
Interest accretion	113.5	211.4	219.7	350.5
Benefits and Protection
Future Policy Benefits and Claims
Gross premiums or assessments	484.2	423.9	970.3	868.0
Interest accretion	82.8	75.2	163.7	150.8
Benefits and Protection | Specialty Benefits | Individual disability
Future Policy Benefits and Claims
Gross premiums or assessments	154.7	148.5	305.3	292.9
Interest accretion	23.5	22.7	46.7	45.0
Benefits and Protection | Life Insurance | Universal life
Future Policy Benefits and Claims
Gross premiums or assessments	167.5	118.2	342.1	260.7
Interest accretion	47.6	41.8	93.9	84.3
Benefits and Protection | Life Insurance | Term life
Future Policy Benefits and Claims
Gross premiums or assessments	162.0	157.2	322.9	314.4
Interest accretion	11.7	10.7	23.1	21.5
Corporate | Long-term care insurance
Future Policy Benefits and Claims
Gross premiums or assessments	1.2	1.3	2.7	2.7
Interest accretion	$ 2.6	$ 2.4	$ 5.1	$ 4.8

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