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Revenues from Contracts with Customers - Disaggregation by Segment (Details) - USD ($) $ in Millions | 3 Months Ended
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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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