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Revenues from Contracts with Customers - Disaggregation by Segment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenues from Contracts with Customers - Disaggregation of Revenues |  |  |
Total fees and other revenues per consolidated statements of operations | $ 4,095.9 | $ 4,137.8 | $ 5,041.3
Operating Segments |  |  |
Revenues from Contracts with Customers - Disaggregation of Revenues |  |  |
Total segment revenue from contracts with customers | 2,814.9 | 2,875.8 | 3,150.1
Operating Segments | Retirement and Income Solutions |  |  |
Revenues from Contracts with Customers - Disaggregation of Revenues |  |  |
Total segment revenue from contracts with customers | 556.3 | 551.4 | 590.1
Adjustments for fees and other revenues not within the scope of revenue recognition guidance | 1,118.7 | 1,114.0 | 1,226.9
Total fees and other revenues per consolidated statements of operations | 1,675.0 | 1,665.4 | 1,817.0
Operating Segments | Principal Asset Management |  |  |
Revenues from Contracts with Customers - Disaggregation of Revenues |  |  |
Total segment revenue from contracts with customers | 1,989.6 | 2,077.6 | 2,254.6
Operating Segments | Benefits and Protection |  |  |
Revenues from Contracts with Customers - Disaggregation of Revenues |  |  |
Total segment revenue from contracts with customers | 89.8 | 80.1 | 75.3
Operating Segments | Corporate |  |  |
Revenues from Contracts with Customers - Disaggregation of Revenues |  |  |
Total segment revenue from contracts with customers | 179.2 | 166.7 | 230.1
Adjustments for fees and other revenues not within the scope of revenue recognition guidance | (299.0) | (312.6) | (359.3)
Total fees and other revenues per consolidated statements of operations | (119.8) | (145.9) | (129.2)
Operating Segments | Principal Global Investors | Principal Asset Management |  |  |
Revenues from Contracts with Customers - Disaggregation of Revenues |  |  |
Total segment revenue from contracts with customers | 1,554.1 | 1,675.0 | 1,787.9
Adjustments for fees and other revenues not within the scope of revenue recognition guidance | 24.9 | 27.4 | 36.2
Total fees and other revenues per consolidated statements of operations | 1,579.0 | 1,702.4 | 1,824.1
Operating Segments | Principal International | Principal Asset Management |  |  |
Revenues from Contracts with Customers - Disaggregation of Revenues |  |  |
Total segment revenue from contracts with customers | 456.5 | 426.3 | 492.7
Adjustments for fees and other revenues not within the scope of revenue recognition guidance | 5.8 | 4.5 | 4.2
Total fees and other revenues per consolidated statements of operations | 462.3 | 430.8 | 496.9
Operating Segments | Specialty Benefits | Benefits and Protection |  |  |
Revenues from Contracts with Customers - Disaggregation of Revenues |  |  |
Total segment revenue from contracts with customers | 15.9 | 15.1 | 14.9
Adjustments for fees and other revenues not within the scope of revenue recognition guidance | 18.2 | 18.6 | 19.0
Total fees and other revenues per consolidated statements of operations | 34.1 | 33.7 | 33.9
Operating Segments | Life Insurance | Benefits and Protection |  |  |
Revenues from Contracts with Customers - Disaggregation of Revenues |  |  |
Total segment revenue from contracts with customers | 74.0 | 65.1 | 60.6
Adjustments for fees and other revenues not within the scope of revenue recognition guidance | 333.3 | 321.5 | 885.0
Total fees and other revenues per consolidated statements of operations | 407.3 | 386.6 | 945.6
Operating Segments | Eliminations | Benefits and Protection |  |  |
Revenues from Contracts with Customers - Disaggregation of Revenues |  |  |
Total segment revenue from contracts with customers | (0.1) | (0.1) | (0.2)
Operating Segments | Principal Asset Management Eliminations | Principal Asset Management |  |  |
Revenues from Contracts with Customers - Disaggregation of Revenues |  |  |
Total segment revenue from contracts with customers | (21.0) | (23.7) | (26.0)
Reconciling Items |  |  |
Revenues from Contracts with Customers - Disaggregation of Revenues |  |  |
Adjustments for fees and other revenues not within the scope of revenue recognition guidance | 1,200.5 | 1,172.8 | 1,811.3
Pre-tax other adjustments | $ 80.5 | $ 89.2 | $ 79.9

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