v3.26.3
Derivatives and Financial Instruments - Assets and Liabilities Measured at Fair Value (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Dec. 31, 2025
Dec. 02, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Foreign currency contract liabilities $ (49.3)   $ (49.3) $ (69.0)  
Contingent earn-out liabilities         $ (8.0)
Impairment of intangible assets 0.0 $ 0.0 0.0 30.9  
Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Interest rate contract liabilities       (0.2)  
Foreign currency contract assets 6.2   6.2    
Foreign currency contract liabilities (49.3)   (49.3) (68.8)  
Deferred compensation plan 36.4   36.4 32.3  
Contingent earn-out liabilities (4.0)   (4.0) (8.0)  
Total recurring fair value measurements (10.0)   (10.0) (44.7)  
Recurring | Interest Rate Contract          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Interest rate contract assets 0.7   0.7    
Level 1 | Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Interest rate contract liabilities       0.0  
Foreign currency contract assets 0.0   0.0    
Foreign currency contract liabilities 0.0   0.0 0.0  
Deferred compensation plan 36.4   36.4 32.3  
Contingent earn-out liabilities 0.0   0.0 0.0  
Total recurring fair value measurements 36.4   36.4 32.3  
Level 1 | Recurring | Interest Rate Contract          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Interest rate contract assets 0.0   0.0    
Level 2 | Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Interest rate contract liabilities       (0.2)  
Foreign currency contract assets 6.2   6.2    
Foreign currency contract liabilities (49.3)   (49.3) (68.8)  
Deferred compensation plan 0.0   0.0 0.0  
Contingent earn-out liabilities 0.0   0.0 0.0  
Total recurring fair value measurements (42.4)   (42.4) (69.0)  
Level 2 | Recurring | Interest Rate Contract          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Interest rate contract assets 0.7   0.7    
Level 3 | Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Interest rate contract liabilities       0.0  
Foreign currency contract assets 0.0   0.0    
Foreign currency contract liabilities 0.0   0.0 0.0  
Deferred compensation plan 0.0   0.0 0.0  
Contingent earn-out liabilities (4.0)   (4.0) (8.0)  
Total recurring fair value measurements (4.0)   (4.0) $ (8.0)  
Level 3 | Recurring | Interest Rate Contract          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Interest rate contract assets $ 0.0   $ 0.0