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Plant Closure Provisions - Movements in Plant Closure and Restructuring Provisions (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Restructuring and Related Activities [Abstract]    
Beginning Balance $ 60.3  
Charge for the period 5.0  
Utilized in the period (3.9)  
Exchange effect 6.8  
Ending Balance 68.2  
Due within one year (5.0) $ (5.0)
Due after one year $ 63.2 $ 55.3