Quarterly report [Sections 13 or 15(d)]

Restructuring Activities - Schedule of Costs Related to the Restructuring Program (Detail)

v3.25.3
Restructuring Activities - Schedule of Costs Related to the Restructuring Program (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]        
Restructuring Costs, Total $ 0.8 $ 2.7 $ 4.8 $ 68.2
Cumulative cost incurred 92.5   92.5  
Restructuring Program [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Costs, Total 0.8 2.7 4.8 68.2
Cumulative cost incurred 73.9   73.9  
Professional Fees [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Costs, Total 0.0 0.3 (0.5) 4.5
Cumulative cost incurred 26.5   26.5  
Professional Fees [Member] | Restructuring Program [Member]        
Restructuring Cost and Reserve [Line Items]        
Cumulative cost incurred 4.1   4.1  
Retention and Separation [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Costs, Total 0.8 2.4 5.3 63.7
Cumulative cost incurred 64.4   64.4  
Retention and Separation [Member] | Restructuring Program [Member]        
Restructuring Cost and Reserve [Line Items]        
Cumulative cost incurred 69.8   69.8  
Others [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Costs, Total 0.0 $ 0.0 0.0 $ 0.0
Cumulative cost incurred 1.6   1.6  
Others [Member] | Restructuring Program [Member]        
Restructuring Cost and Reserve [Line Items]        
Cumulative cost incurred $ 0.0   $ 0.0