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Future Policy Benefits and Claims - Gross Premiums or Assessments and Interest Accretion (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Future Policy Benefits and Claims
Gross premiums or assessments	$ 1,098.8	$ 994.4	$ 3,390.4	$ 3,787.5
Interest accretion	538.0	526.0	1,640.3	1,549.5
Retirement and Income Solutions
Future Policy Benefits and Claims
Gross premiums or assessments	569.1	473.3	1,833.3	2,245.6
Interest accretion	359.8	341.5	1,068.3	999.9
Retirement and Income Solutions | Pension risk transfer
Future Policy Benefits and Claims
Gross premiums or assessments	560.0	466.3	1,810.1	2,210.4
Interest accretion	310.8	289.9	919.4	842.5
Retirement and Income Solutions | Individual fixed income annuities
Future Policy Benefits and Claims
Gross premiums or assessments	9.1	7.0	23.2	35.2
Interest accretion	49.0	51.6	148.9	157.4
Principal Asset Management | International Pension | Latin America | Individual fixed income annuities
Future Policy Benefits and Claims
Gross premiums or assessments	0.5	5.1	6.4	18.1
Interest accretion	60.9	76.9	228.1	239.7
Benefits and Protection
Future Policy Benefits and Claims
Gross premiums or assessments	528.0	514.9	1,546.6	1,520.0
Interest accretion	114.9	105.2	336.8	303.0
Benefits and Protection | Specialty Benefits | Individual disability
Future Policy Benefits and Claims
Gross premiums or assessments	169.0	166.0	489.4	480.5
Interest accretion	26.4	25.4	78.4	74.4
Benefits and Protection | Life Insurance | Universal life
Future Policy Benefits and Claims
Gross premiums or assessments	182.1	177.8	536.3	534.7
Interest accretion	71.2	64.9	209.5	186.9
Benefits and Protection | Life Insurance | Term life
Future Policy Benefits and Claims
Gross premiums or assessments	176.9	171.1	520.9	504.8
Interest accretion	17.3	14.9	48.9	41.7
Corporate | Long-term care insurance
Future Policy Benefits and Claims
Gross premiums or assessments	1.2	1.1	4.1	3.8
Interest accretion	$ 2.4	$ 2.4	$ 7.1	$ 6.9

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