v3.26.3
Revenues from Contracts with Customers - Disaggregation within Segments, Corporate (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 | Corporate        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 68.7 64.9 208.4 181.0
Fees and other revenues not within the scope of revenue recognition guidance (66.7) (81.4) (205.3) (238.4)
Total fees and other revenues 2.0 (16.5) 3.1 (57.4)
Premiums and other considerations (1.4) (1.3) (4.2) (4.0)
Net investment income 36.2 42.0 145.4 144.3
Total operating revenues 36.8 24.2 144.3 82.9
Operating Segments | Corporate | Commission income        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 120.6 133.5 366.4 396.9
Operating Segments | Corporate | Other fee revenue        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 27.8 25.2 81.8 74.2
Operating Segments | Corporate | Revenue by type - Eliminations        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers $ (79.7) $ (93.8) $ (239.8) $ (290.1)