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Revenues from Contracts with Customers - Disaggregation by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenues from Contracts with Customers - Disaggregation of Revenues
Total fees and other revenues per consolidated statements of operations	$ 1,128.7	$ 1,091.1	$ 3,289.0	$ 3,205.4
Operating Segments
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	779.8	773.1	2,275.6	2,262.2
Operating Segments | Retirement and Income Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	155.4	169.3	449.3	493.3
Adjustments for fees and other revenues not within the scope of revenue recognition guidance	303.9	283.9	885.4	838.7
Total fees and other revenues per consolidated statements of operations	459.3	453.2	1,334.7	1,332.0
Operating Segments | Principal Asset Management
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	532.5	522.7	1,566.8	1,521.3
Operating Segments | Benefits and Protection
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	27.0	28.5	78.5	81.3
Operating Segments | Corporate
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	64.9	52.6	181.0	166.3
Adjustments for fees and other revenues not within the scope of revenue recognition guidance	(81.4)	(78.7)	(238.4)	(235.8)
Total fees and other revenues per consolidated statements of operations	(16.5)	(26.1)	(57.4)	(69.5)
Operating Segments | Investment Management | Principal Asset Management
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	448.6	433.9	1,308.4	1,253.9
Adjustments for fees and other revenues not within the scope of revenue recognition guidance	8.9	4.1	21.5	14.9
Total fees and other revenues per consolidated statements of operations	457.5	438.0	1,329.9	1,268.8
Operating Segments | International Pension | Principal Asset Management
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	88.7	92.3	272.5	279.2
Adjustments for fees and other revenues not within the scope of revenue recognition guidance	5.7	1.3	8.4	4.1
Total fees and other revenues per consolidated statements of operations	94.4	93.6	280.9	283.3
Operating Segments | Specialty Benefits | Benefits and Protection
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	4.0	3.8	11.7	11.6
Adjustments for fees and other revenues not within the scope of revenue recognition guidance	4.4	4.4	13.1	13.4
Total fees and other revenues per consolidated statements of operations	8.4	8.2	24.8	25.0
Operating Segments | Life Insurance | Benefits and Protection
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	23.1	24.7	66.9	69.8
Adjustments for fees and other revenues not within the scope of revenue recognition guidance	89.7	84.9	271.1	251.6
Total fees and other revenues per consolidated statements of operations	112.8	109.6	338.0	321.4
Operating Segments | Benefits And Protection Eliminations | Benefits and Protection
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	(0.1)		(0.1)	(0.1)
Operating Segments | Principal Asset Management Eliminations | Principal Asset Management
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	(4.8)	(3.5)	(14.1)	(11.8)
Reconciling items
Revenues from Contracts with Customers - Disaggregation of Revenues
Adjustments for fees and other revenues not within the scope of revenue recognition guidance	331.2	299.7	961.1	886.5
Pre-tax other adjustments	$ 17.7	$ 18.3	$ 52.3	$ 56.7

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