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Revenues from Contracts with Customers - Disaggregation by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from Contracts with Customers - Disaggregation of Revenues
Total fees and other revenues per consolidated statements of operations	$ 4,511.1	$ 4,409.9	$ 4,273.8
Operating Segments
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	2,768.3	2,610.0	2,658.9
Operating Segments | Retirement and Income Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	599.8	464.8	262.9
Operating Segments | Principal Global Investors
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	1,511.2	1,456.7	1,700.5
Fees and other revenues not within the scope of revenue recognition guidance	22.3	38.5	30.4
Total fees and other revenues per consolidated statements of operations	1,533.5	1,495.2	1,730.9
Operating Segments | Principal International
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	439.2	462.2	477.1
Fees and other revenues not within the scope of revenue recognition guidance	5.6	6.3	7.3
Total fees and other revenues per consolidated statements of operations	444.8	468.5	484.4
Operating Segments | U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	63.2	65.9	57.0
Operating Segments | Corporate
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	154.9	160.4	161.4
Fees and other revenues not within the scope of revenue recognition guidance	(303.9)	(301.8)	(316.3)
Total fees and other revenues per consolidated statements of operations	(149.0)	(141.4)	(154.9)
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	591.2	455.5	252.4
Fees and other revenues not within the scope of revenue recognition guidance	1,130.4	1,139.0	1,132.9
Total fees and other revenues per consolidated statements of operations	1,721.6	1,594.5	1,385.3
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	8.6	9.3	10.5
Fees and other revenues not within the scope of revenue recognition guidance	9.5	13.9	12.5
Total fees and other revenues per consolidated statements of operations	18.1	23.2	23.0
Operating Segments | Specialty Benefits insurance | U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	14.8	14.9	14.8
Fees and other revenues not within the scope of revenue recognition guidance	19.3	19.6	20.6
Total fees and other revenues per consolidated statements of operations	34.1	34.5	35.4
Operating Segments | Individual Life insurance | U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	48.6	51.2	42.4
Fees and other revenues not within the scope of revenue recognition guidance	849.8	875.9	727.0
Total fees and other revenues per consolidated statements of operations	898.4	927.1	769.4
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	1,733.0	1,791.4	1,614.4
Pre-tax other adjustments	$ 9.8	$ 8.5	$ 0.5

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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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