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Plant Closure Provisions - Movements in Plant Closure and Restructuring Provisions (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Restructuring and Related Activities [Abstract]    
Beginning Balance $ 56.5  
Charge for the period 1.9  
Utilized in the period (1.9)  
Exchange effect (0.7)  
Ending Balance 55.8  
Due within one year (6.6) $ (5.2)
Due after one year $ 49.2 $ 51.3