v3.26.3
Share-Based Compensation (Costs Associated with Share-Based Compensation Plans) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation $ 11.3 $ 11.8 $ 51.7 $ 59.6
RSUs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation 8.7 8.6 42.0 47.8
PRSUs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation 0.9 1.5 4.1 6.5
Employee Stock Purchase Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation $ 1.7 $ 1.7 $ 5.6 $ 5.3