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Revenues from Contracts with Customers - Disaggregation by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues from Contracts with Customers - Disaggregation of Revenues
Total fees and other revenues per consolidated statements of operations	$ 1,265.3	$ 1,044.3	$ 2,459.2	$ 2,189.6
Operating Segments
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	795.2	653.3	1,533.3	1,353.7
Operating Segments | Retirement and Income Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	150.1	153.2	294.4	311.7
Operating Segments | Principal Global Investors
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	444.0	348.2	850.1	731.1
Fees and other revenues not within the scope of revenue recognition guidance	8.1	3.9	16.1	9.4
Total fees and other revenues per consolidated statements of operations	452.1	352.1	866.2	740.5
Operating Segments | Principal International
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	126.5	101.6	248.4	211.1
Fees and other revenues not within the scope of revenue recognition guidance	1.1	1.5	2.1	2.8
Total fees and other revenues per consolidated statements of operations	127.6	103.1	250.5	213.9
Operating Segments | U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	18.7	14.4	36.1	31.0
Operating Segments | Corporate
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	55.9	35.9	104.3	68.8
Fees and other revenues not within the scope of revenue recognition guidance	(88.5)	(69.2)	(174.5)	(145.3)
Total fees and other revenues per consolidated statements of operations	(32.6)	(33.3)	(70.2)	(76.5)
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	147.7	151.2	289.6	307.6
Fees and other revenues not within the scope of revenue recognition guidance	326.5	255.1	640.2	535.6
Total fees and other revenues per consolidated statements of operations	474.2	406.3	929.8	843.2
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	2.0	4.8	4.1
Fees and other revenues not within the scope of revenue recognition guidance	2.7	2.8	4.7	5.9
Total fees and other revenues per consolidated statements of operations	5.1	4.8	9.5	10.0
Operating Segments | Specialty Benefits insurance | U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	3.8	3.5	7.5	7.3
Fees and other revenues not within the scope of revenue recognition guidance	4.7	4.6	9.5	9.5
Total fees and other revenues per consolidated statements of operations	8.5	8.1	17.0	16.8
Operating Segments | Individual Life insurance | U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total segment revenue from contracts with customers	15.0	11.0	28.7	23.8
Fees and other revenues not within the scope of revenue recognition guidance	211.5	191.8	431.7	401.8
Total fees and other revenues per consolidated statements of operations	226.5	202.8	460.4	425.6
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	(0.1)	(0.1)	(0.1)	(0.1)
Reconciling Items
Revenues from Contracts with Customers - Disaggregation of Revenues
Fees and other revenues not within the scope of revenue recognition guidance	466.1	390.5	929.8	819.7
Pre-tax other adjustments	$ 4.0	$ 0.5	$ (3.9)	$ 16.2

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