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Revenues from Contracts with Customers - Disaggregation within Segments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total fees and other revenues $ 1,077.7 $ 1,052.9
Premiums and other considerations 1,751.3 1,684.6
Net investment income (loss) 1,165.7 1,072.2
Operating Segments    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 745.8 738.5
Operating Segments | Benefits and Protection    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 24.8 24.7
Operating Segments | Benefits and Protection | Specialty Benefits    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 3.7 3.8
Fees and other revenues not within the scope of revenue recognition guidance 4.6 4.6
Total fees and other revenues 8.3 8.4
Premiums and other considerations 823.2 792.9
Net investment income (loss) 52.4 47.0
Total operating revenues 883.9 848.3
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 3.7 3.8
Operating Segments | Benefits and Protection | Life Insurance    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 21.1 20.9
Fees and other revenues not within the scope of revenue recognition guidance 89.6 84.2
Total fees and other revenues 110.7 105.1
Premiums and other considerations 124.4 128.9
Net investment income (loss) 95.4 103.8
Total operating revenues 330.5 337.8
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 10.9 7.9
Operating Segments | Benefits and Protection | Life Insurance | Commission income    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 10.2 13.0
Operating Segments | Principal Asset Management    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 514.7 496.6
Operating Segments | Principal Asset Management | Investment Management    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 426.7 407.1
Fees and other revenues not within the scope of revenue recognition guidance 2.8 5.2
Total fees and other revenues 429.5 412.3
Net investment income (loss) 24.2 23.2
Total operating revenues 453.7 435.5
Operating Segments | Principal Asset Management | Investment Management | Management fee revenue    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 389.1 370.5
Operating Segments | Principal Asset Management | Investment Management | Other fee revenue    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 37.6 36.6
Operating Segments | Principal Asset Management | International Pension    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 92.4 93.3
Fees and other revenues not within the scope of revenue recognition guidance 1.2 1.3
Total fees and other revenues 93.6 94.6
Premiums and other considerations 1.7 2.0
Net investment income (loss) 142.5 127.2
Total operating revenues 237.8 223.8
Operating Segments | Principal Asset Management | International Pension | Management fee revenue    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 89.2 89.1
Operating Segments | Principal Asset Management | International Pension | Other fee revenue    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 3.2 4.2
Operating Segments | Retirement and Income Solutions    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 145.7 159.3
Fees and other revenues not within the scope of revenue recognition guidance 295.5 279.3
Total fees and other revenues 441.2 438.6
Premiums and other considerations 810.3 765.6
Net investment income (loss) 823.7 728.2
Total operating revenues 2,075.2 1,932.4
Operating Segments | Retirement and Income Solutions | Administrative service fee revenue    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 141.2 155.5
Operating Segments | Retirement and Income Solutions | Deposit account fee revenue    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 3.4 3.1
Operating Segments | Retirement and Income Solutions | Commission income    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 1.1 0.7
Operating Segments | Corporate    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 60.6 57.9
Fees and other revenues not within the scope of revenue recognition guidance (78.9) (79.3)
Total fees and other revenues (18.3) (21.4)
Premiums and other considerations (1.3) (1.3)
Net investment income (loss) 56.7 53.8
Total operating revenues 37.1 31.1
Operating Segments | Corporate | Other fee revenue    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 23.9 21.7
Operating Segments | Corporate | Commission income    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers 131.5 105.5
Operating Segments | Corporate | Revenue by type - Eliminations    
Revenues from Contracts with Customers - Disaggregation of Revenues    
Total revenues from contracts with customers $ (94.8) $ (69.3)