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Revenues from Contracts with Customers - Disaggregation by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from Contracts with Customers - Disaggregation of Revenues
Total fees and other revenues per consolidated statements of operations	$ 5,012.6	$ 4,511.1	$ 4,409.9
Operating Segments
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	3,150.1	2,768.3	2,610.0
Operating Segments | Retirement and Income Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	590.1	599.8	464.8
Operating Segments | Principal Global Investors
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	1,787.9	1,511.2	1,456.7
Fees and other revenues not within the scope of revenue recognition guidance	36.2	22.3	38.5
Total fees and other revenues per consolidated statements of operations	1,824.1	1,533.5	1,495.2
Operating Segments | Principal International
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	492.7	439.2	462.2
Fees and other revenues not within the scope of revenue recognition guidance	4.1	5.6	6.3
Total fees and other revenues per consolidated statements of operations	496.8	444.8	468.5
Operating Segments | U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	75.3	63.2	65.9
Operating Segments | Corporate
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	204.1	154.9	160.4
Fees and other revenues not within the scope of revenue recognition guidance	(360.0)	(303.9)	(301.8)
Total fees and other revenues per consolidated statements of operations	(155.9)	(149.0)	(141.4)
Operating Segments | Retirement and Income Solutions - Fee | Retirement and Income Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	580.2	591.2	455.5
Fees and other revenues not within the scope of revenue recognition guidance	1,299.6	1,130.4	1,139.0
Total fees and other revenues per consolidated statements of operations	1,879.8	1,721.6	1,594.5
Operating Segments | Retirement and Income Solutions - Spread | Retirement and Income Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	9.9	8.6	9.3
Fees and other revenues not within the scope of revenue recognition guidance	7.9	9.5	13.9
Total fees and other revenues per consolidated statements of operations	17.8	18.1	23.2
Operating Segments | Specialty Benefits insurance | U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	14.9	14.8	14.9
Fees and other revenues not within the scope of revenue recognition guidance	19.0	19.3	19.6
Total fees and other revenues per consolidated statements of operations	33.9	34.1	34.5
Operating Segments | Individual Life insurance | U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	60.6	48.6	51.2
Fees and other revenues not within the scope of revenue recognition guidance	859.2	849.8	875.9
Total fees and other revenues per consolidated statements of operations	919.8	898.4	927.1
Operating Segments | U.S. Insurance Solutions Eliminations | U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	(0.2)	(0.2)	(0.2)
Reconciling Items
Revenues from Contracts with Customers - Disaggregation of Revenues
Fees and other revenues not within the scope of revenue recognition guidance	1,866.0	1,733.0	1,791.4
Pre-tax other adjustments	$ (3.5)	$ 9.8	$ 8.5

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Amount of fees and commissions from financial services and banking activities and correspondent clearing, excluding contracts with customers and other pre-tax adjustments.

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