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Revenues from Contracts with Customers - Disaggregation within Segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total fees and other revenues $ 4,320.5 $ 4,095.9 $ 4,137.8
Premiums and other considerations 6,850.2 6,470.9 5,339.7
Net investment income (loss) 4,449.2 4,091.9 3,838.5
Benefits and Protection      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Premiums and other considerations 3,689.8 3,521.4 3,306.5
Net investment income (loss) 594.5 549.5 564.2
Principal Asset Management      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Premiums and other considerations 28.7 29.0 77.7
Net investment income (loss) 568.3 628.6 840.6
Retirement and Income Solutions      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Premiums and other considerations 3,136.9 2,935.0 1,959.7
Net investment income (loss) 3,061.6 2,674.3 2,252.2
Corporate      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Premiums and other considerations (5.2) (14.5) (4.2)
Net investment income (loss) 224.8 239.5 181.5
Operating Segments      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 3,053.4 2,814.9 2,875.8
Operating Segments | Benefits and Protection      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 109.7 89.8 80.1
Operating Segments | Benefits and Protection | Specialty Benefits      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 15.4 15.9 15.1
Fees and other revenues not within the scope of revenue recognition guidance 17.9 18.2 18.6
Total fees and other revenues 33.3 34.1 33.7
Premiums and other considerations 3,223.9 3,020.9 2,771.1
Net investment income (loss) 191.6 174.4 179.8
Total operating revenues 3,448.8 3,229.4 2,984.6
Operating Segments | Benefits and Protection | Specialty Benefits | Administrative service fee revenue      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 15.4 15.9 15.1
Operating Segments | Benefits and Protection | Life Insurance      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 94.4 74.0 65.1
Fees and other revenues not within the scope of revenue recognition guidance 341.5 333.3 321.5
Total fees and other revenues 435.9 407.3 386.6
Premiums and other considerations 491.6 514.9 535.9
Net investment income (loss) 413.5 401.5 396.3
Total operating revenues 1,341.0 1,323.7 1,318.8
Operating Segments | Benefits and Protection | Life Insurance | Administrative service fee revenue      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 39.3 31.2 27.6
Operating Segments | Benefits and Protection | Life Insurance | Commission income      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 55.1 42.8 37.5
Operating Segments | Principal Asset Management      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 2,050.3 1,989.6 2,077.6
Operating Segments | Principal Asset Management | Investment Management      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 1,694.5 1,627.6 1,743.4
Fees and other revenues not within the scope of revenue recognition guidance 20.9 24.4 27.4
Total fees and other revenues 1,715.4 1,652.0 1,770.8
Net investment income (loss) 105.3 97.6 94.0
Total operating revenues 1,820.7 1,749.6 1,864.8
Operating Segments | Principal Asset Management | Investment Management | Management fee revenue      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 1,533.8 1,441.0 1,500.0
Operating Segments | Principal Asset Management | Investment Management | Other fee revenue      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 160.7 186.6 243.4
Operating Segments | Principal Asset Management | International Pension      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 371.6 383.1 356.8
Fees and other revenues not within the scope of revenue recognition guidance 5.4 5.8 5.3
Total fees and other revenues 377.0 388.9 362.1
Premiums and other considerations 28.7 29.0 77.7
Net investment income (loss) 580.4 636.8 900.7
Total operating revenues 986.1 1,054.7 1,340.5
Operating Segments | Principal Asset Management | International Pension | Management fee revenue      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 356.6 363.8 335.0
Operating Segments | Principal Asset Management | International Pension | Other fee revenue      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 15.0 19.3 21.8
Operating Segments | Retirement and Income Solutions      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 667.1 556.3 551.4
Fees and other revenues not within the scope of revenue recognition guidance 1,123.3 1,118.7 1,114.0
Total fees and other revenues 1,790.4 1,675.0 1,665.4
Premiums and other considerations 3,136.9 2,935.0 1,959.7
Net investment income (loss) 3,048.8 2,640.2 2,274.1
Total operating revenues 7,976.1 7,250.2 5,899.2
Operating Segments | Retirement and Income Solutions | Administrative service fee revenue      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 651.1 539.5 537.0
Operating Segments | Retirement and Income Solutions | Deposit account fee revenue      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 12.4 11.3 10.2
Operating Segments | Retirement and Income Solutions | Other fee revenue      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers   3.6 3.0
Operating Segments | Retirement and Income Solutions | Commission income      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 3.6 1.9 1.2
Operating Segments | Corporate      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 226.3 179.2 166.7
Fees and other revenues not within the scope of revenue recognition guidance (315.9) (299.0) (312.6)
Total fees and other revenues (89.6) (119.8) (145.9)
Premiums and other considerations (5.2) (14.5) (4.2)
Net investment income (loss) 171.6 210.7 167.2
Total operating revenues 76.8 76.4 17.1
Operating Segments | Corporate | Other fee revenue      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 89.1 84.1 79.7
Operating Segments | Corporate | Commission income      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers 482.0 373.9 366.2
Operating Segments | Corporate | Revenue by type - Eliminations      
Revenues from Contracts with Customers - Disaggregation of Revenues      
Total revenues from contracts with customers $ (344.8) $ (278.8) $ (279.2)