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Revenues from Contracts with Customers - Disaggregation by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues from Contracts with Customers - Disaggregation of Revenues
Total fees and other revenues per consolidated statements of operations	$ 1,193.9	$ 1,145.3
Operating Segments
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	738.1	700.4
Operating Segments | Retirement and Income Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	144.3	158.5
Operating Segments | Principal Global Investors
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	406.1	382.9
Fees and other revenues not within the scope of revenue recognition guidance	8.0	5.5
Total fees and other revenues per consolidated statements of operations	414.1	388.4
Operating Segments | Principal International
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	121.9	109.5
Fees and other revenues not within the scope of revenue recognition guidance	1.0	1.3
Total fees and other revenues per consolidated statements of operations	122.9	110.8
Operating Segments | U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	17.4	16.6
Operating Segments | Corporate
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	48.4	32.9
Fees and other revenues not within the scope of revenue recognition guidance	(86.0)	(76.1)
Total fees and other revenues per consolidated statements of operations	(37.6)	(43.2)
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	141.9	156.4
Fees and other revenues not within the scope of revenue recognition guidance	313.7	280.5
Total fees and other revenues per consolidated statements of operations	455.6	436.9
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	2.4	2.1
Fees and other revenues not within the scope of revenue recognition guidance	2.0	3.1
Total fees and other revenues per consolidated statements of operations	4.4	5.2
Operating Segments | Specialty Benefits insurance | U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	3.7	3.8
Fees and other revenues not within the scope of revenue recognition guidance	4.8	4.9
Total fees and other revenues per consolidated statements of operations	8.5	8.7
Operating Segments | Individual Life insurance | U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	13.7	12.8
Fees and other revenues not within the scope of revenue recognition guidance	220.2	210.0
Total fees and other revenues per consolidated statements of operations	233.9	222.8
Reconciling Items
Revenues from Contracts with Customers - Disaggregation of Revenues
Fees and other revenues not within the scope of revenue recognition guidance	463.7	429.2
Pre-tax other adjustments	$ (7.9)	$ 15.7

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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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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