v3.25.2
Revenues from Contracts with Customers - Disaggregation within Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total fees and other revenues $ 1,082.6 $ 1,061.4 $ 2,160.3 $ 2,114.3
Premiums and other considerations 1,396.5 1,926.6 3,147.8 3,611.2
Net investment income (loss) 1,162.8 1,086.1 2,328.5 2,158.3
Operating Segments        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 750.0 750.6 1,495.8 1,489.1
Operating Segments | Benefits and Protection        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 26.7 28.1 51.5 52.8
Operating Segments | Benefits and Protection | Specialty Benefits        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 4.0 4.0 7.7 7.8
Fees and other revenues not within the scope of revenue recognition guidance 4.1 4.4 8.7 9.0
Total fees and other revenues 8.1 8.4 16.4 16.8
Premiums and other considerations 832.1 805.1 1,655.3 1,598.0
Net investment income (loss) 52.0 44.8 104.4 91.8
Total operating revenues 892.2 858.3 1,776.1 1,706.6
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 4.0 4.0 7.7 7.8
Operating Segments | Benefits and Protection | Life Insurance        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 22.7 24.2 43.8 45.1
Fees and other revenues not within the scope of revenue recognition guidance 91.8 82.5 181.4 166.7
Total fees and other revenues 114.5 106.7 225.2 211.8
Premiums and other considerations 123.5 120.3 247.9 249.2
Net investment income (loss) 116.2 102.1 211.6 205.9
Total operating revenues 354.2 329.1 684.7 666.9
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 10.9 10.7 21.8 18.6
Operating Segments | Benefits and Protection | Life Insurance | Commission income        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 11.8 13.5 22.0 26.5
Operating Segments | Principal Asset Management        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 519.6 502.0 1,034.3 998.6
Operating Segments | Principal Asset Management | Investment Management        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 433.1 412.9 859.8 820.0
Fees and other revenues not within the scope of revenue recognition guidance 9.8 5.6 12.6 10.8
Total fees and other revenues 442.9 418.5 872.4 830.8
Net investment income (loss) 24.3 25.7 48.5 48.9
Total operating revenues 467.2 444.2 920.9 879.7
Operating Segments | Principal Asset Management | Investment Management | Management fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 388.1 374.3 777.2 744.8
Operating Segments | Principal Asset Management | Investment Management | Other fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 45.0 38.6 82.6 75.2
Operating Segments | Principal Asset Management | International Pension        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 91.4 93.6 183.8 186.9
Fees and other revenues not within the scope of revenue recognition guidance 1.5 1.5 2.7 2.8
Total fees and other revenues 92.9 95.1 186.5 189.7
Premiums and other considerations 3.9 11.2 5.6 13.2
Net investment income (loss) 144.0 138.8 286.5 266.0
Total operating revenues 240.8 245.1 478.6 468.9
Operating Segments | Principal Asset Management | International Pension | Management fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 87.6 89.7 176.8 178.8
Operating Segments | Principal Asset Management | International Pension | Other fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 3.8 3.9 7.0 8.1
Operating Segments | Retirement and Income Solutions        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 148.2 164.7 293.9 324.0
Fees and other revenues not within the scope of revenue recognition guidance 286.0 275.5 581.5 554.8
Total fees and other revenues 434.2 440.2 875.4 878.8
Premiums and other considerations 447.2 999.5 1,257.5 1,765.1
Net investment income (loss) 836.9 754.6 1,660.6 1,482.8
Total operating revenues 1,718.3 2,194.3 3,793.5 4,126.7
Operating Segments | Retirement and Income Solutions | Administrative service fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 143.6 160.8 284.8 316.3
Operating Segments | Retirement and Income Solutions | Deposit account fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 3.2 3.0 6.6 6.1
Operating Segments | Retirement and Income Solutions | Commission income        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 1.4 0.9 2.5 1.6
Operating Segments | Corporate        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 55.5 55.8 116.1 113.7
Fees and other revenues not within the scope of revenue recognition guidance (78.1) (77.8) (157.0) (157.1)
Total fees and other revenues (22.6) (22.0) (40.9) (43.4)
Premiums and other considerations (1.4) (1.3) (2.7) (2.6)
Net investment income (loss) 45.6 29.7 102.3 83.5
Total operating revenues 21.6 6.4 58.7 37.5
Operating Segments | Corporate | Other fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 25.1 22.4 49.0 44.1
Operating Segments | Corporate | Commission income        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 131.9 116.9 263.4 222.4
Operating Segments | Corporate | Revenue by type - Eliminations        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers $ (101.5) $ (83.5) $ (196.3) $ (152.8)