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Revenues from Contracts with Customers - Disaggregation within Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total fees and other revenues $ 1,128.7 $ 1,091.1 $ 3,289.0 $ 3,205.4
Premiums and other considerations 1,532.8 1,412.9 4,680.6 5,024.1
Net investment income (loss) 1,200.5 1,167.6 3,529.0 3,325.9
Operating Segments        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 779.8 773.1 2,275.6 2,262.2
Operating Segments | Benefits and Protection        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 27.0 28.5 78.5 81.3
Operating Segments | Benefits and Protection | Specialty Benefits        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 4.0 3.8 11.7 11.6
Fees and other revenues not within the scope of revenue recognition guidance 4.4 4.4 13.1 13.4
Total fees and other revenues 8.4 8.2 24.8 25.0
Premiums and other considerations 836.8 810.6 2,492.1 2,408.6
Net investment income (loss) 51.3 50.1 155.7 141.9
Total operating revenues 896.5 868.9 2,672.6 2,575.5
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 4.0 3.8 11.7 11.6
Operating Segments | Benefits and Protection | Life Insurance        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 23.1 24.7 66.9 69.8
Fees and other revenues not within the scope of revenue recognition guidance 89.7 84.9 271.1 251.6
Total fees and other revenues 112.8 109.6 338.0 321.4
Premiums and other considerations 136.1 131.5 384.0 380.7
Net investment income (loss) 115.3 103.7 326.9 309.6
Total operating revenues 364.2 344.8 1,048.9 1,011.7
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 11.0 10.3 32.8 28.9
Operating Segments | Benefits and Protection | Life Insurance | Commission income        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 12.1 14.4 34.1 40.9
Operating Segments | Principal Asset Management        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 532.5 522.7 1,566.8 1,521.3
Operating Segments | Principal Asset Management | Investment Management        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 448.6 433.9 1,308.4 1,253.9
Fees and other revenues not within the scope of revenue recognition guidance 8.9 4.1 21.5 14.9
Total fees and other revenues 457.5 438.0 1,329.9 1,268.8
Net investment income (loss) 26.4 28.4 74.9 77.3
Total operating revenues 483.9 466.4 1,404.8 1,346.1
Operating Segments | Principal Asset Management | Investment Management | Management fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 409.5 390.1 1,186.7 1,134.9
Operating Segments | Principal Asset Management | Investment Management | Other fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 39.1 43.8 121.7 119.0
Operating Segments | Principal Asset Management | International Pension        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 88.7 92.3 272.5 279.2
Fees and other revenues not within the scope of revenue recognition guidance 5.7 1.3 8.4 4.1
Total fees and other revenues 94.4 93.6 280.9 283.3
Premiums and other considerations 0.5 4.8 6.1 18.0
Net investment income (loss) 153.1 179.0 439.6 445.0
Total operating revenues 248.0 277.4 726.6 746.3
Operating Segments | Principal Asset Management | International Pension | Management fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 85.2 89.0 262.0 267.8
Operating Segments | Principal Asset Management | International Pension | Other fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 3.5 3.3 10.5 11.4
Operating Segments | Retirement and Income Solutions        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 155.4 169.3 449.3 493.3
Fees and other revenues not within the scope of revenue recognition guidance 303.9 283.9 885.4 838.7
Total fees and other revenues 459.3 453.2 1,334.7 1,332.0
Premiums and other considerations 566.5 471.7 1,824.0 2,236.8
Net investment income (loss) 860.4 761.5 2,521.0 2,244.3
Total operating revenues 1,886.2 1,686.4 5,679.7 5,813.1
Operating Segments | Retirement and Income Solutions | Administrative service fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 150.5 165.3 435.3 481.6
Operating Segments | Retirement and Income Solutions | Deposit account fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 3.3 3.1 9.9 9.2
Operating Segments | Retirement and Income Solutions | Commission income        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 1.6 0.9 4.1 2.5
Operating Segments | Corporate        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 64.9 52.6 181.0 166.3
Fees and other revenues not within the scope of revenue recognition guidance (81.4) (78.7) (238.4) (235.8)
Total fees and other revenues (16.5) (26.1) (57.4) (69.5)
Premiums and other considerations (1.3) (1.3) (4.0) (3.9)
Net investment income (loss) 42.0 58.5 144.3 142.0
Total operating revenues 24.2 31.1 82.9 68.6
Operating Segments | Corporate | Other fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 25.2 22.4 74.2 66.5
Operating Segments | Corporate | Commission income        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 133.5 129.4 396.9 351.8
Operating Segments | Corporate | Revenue by type - Eliminations        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers $ (93.8) $ (99.2) $ (290.1) $ (252.0)