v3.26.3
Revenues from Contracts with Customers - Disaggregation within Segments, Benefits and Protection, Specialty Benefits (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 | Benefits and Protection        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 15.4 27.0 46.2 78.5
Operating Segments | Benefits and Protection | Specialty Benefits        
Revenues from Contracts with Customers - Disaggregation of Revenues        
Total revenues from contracts with customers 3.3 4.0 10.6 11.7
Fees and other revenues not within the scope of revenue recognition guidance 4.7 4.4 13.2 13.1
Total fees and other revenues 8.0 8.4 23.8 24.8
Premiums and other considerations 887.4 836.8 2,606.3 2,492.1
Net investment income 59.0 51.3 170.1 155.7
Total operating revenues 954.4 896.5 2,800.2 2,672.6
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 $ 3.3 $ 4.0 $ 10.6 $ 11.7