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Revenues from Contracts with Customers - Disaggregation by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenues from Contracts with Customers - Disaggregation of Revenues
Total fees and other revenues per consolidated statements of operations	$ 1,077.7	$ 1,052.9
Operating Segments
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	745.8	738.5
Operating Segments | Retirement and Income Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	145.7	159.3
Adjustments for fees and other revenues not within the scope of revenue recognition guidance	295.5	279.3
Total fees and other revenues per consolidated statements of operations	441.2	438.6
Operating Segments | Principal Asset Management
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	514.7	496.6
Operating Segments | Benefits and Protection
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	24.8	24.7
Operating Segments | Corporate
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	60.6	57.9
Adjustments for fees and other revenues not within the scope of revenue recognition guidance	(78.9)	(79.3)
Total fees and other revenues per consolidated statements of operations	(18.3)	(21.4)
Operating Segments | Investment Management | Principal Asset Management
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	426.7	407.1
Adjustments for fees and other revenues not within the scope of revenue recognition guidance	2.8	5.2
Total fees and other revenues per consolidated statements of operations	429.5	412.3
Operating Segments | International Pension | Principal Asset Management
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	92.4	93.3
Adjustments for fees and other revenues not within the scope of revenue recognition guidance	1.2	1.3
Total fees and other revenues per consolidated statements of operations	93.6	94.6
Operating Segments | Specialty Benefits | Benefits and Protection
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	3.7	3.8
Adjustments for fees and other revenues not within the scope of revenue recognition guidance	4.6	4.6
Total fees and other revenues per consolidated statements of operations	8.3	8.4
Operating Segments | Life Insurance | Benefits and Protection
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	21.1	20.9
Adjustments for fees and other revenues not within the scope of revenue recognition guidance	89.6	84.2
Total fees and other revenues per consolidated statements of operations	110.7	105.1
Operating Segments | Principal Asset Management Eliminations | Principal Asset Management
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	(4.4)	(3.8)
Reconciling items
Revenues from Contracts with Customers - Disaggregation of Revenues
Adjustments for fees and other revenues not within the scope of revenue recognition guidance	314.5	295.1
Pre-tax other adjustments	$ 17.4	$ 19.3

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