v3.26.3
Revenues from Contracts with Customers - Disaggregation within Segments, Principal Asset Management, Investment Management (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total fees and other revenues $ 1,144.1 $ 1,128.7 $ 3,407.4 $ 3,289.0
Premiums and other considerations 1,897.9 1,532.8 4,506.8 4,680.6
Net investment income 1,160.8 1,200.5 3,661.6 3,529.0
Operating Segments        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 752.4 779.8 2,309.3 2,275.6
Operating Segments | Principal Asset Management        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 521.2 532.5 1,575.1 1,566.8
Operating Segments | Principal Asset Management | Investment Management        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 436.3 448.6 1,309.5 1,308.4
Fees and other revenues not within the scope of revenue recognition guidance 14.3 8.9 32.4 21.5
Total fees and other revenues 450.6 457.5 1,341.9 1,329.9
Net investment income 26.2 26.4 73.3 74.9
Total operating revenues 476.8 483.9 1,415.2 1,404.8
Operating Segments | Principal Asset Management | Investment Management | Management fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 394.9 409.5 1,190.3 1,186.7
Operating Segments | Principal Asset Management | Investment Management | Other fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers $ 41.4 $ 39.1 $ 119.2 $ 121.7