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Plant Closure Provisions - Movements in Plant Closure and Restructuring Provisions (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Restructuring and Related Activities [Abstract]    
Beginning Balance $ 49.3  
Charge for the period 1.1  
Utilized in the period (1.0)  
Exchange effect (0.1)  
Ending Balance 49.3  
Due within one year (5.6) $ (5.6)
Due after one year $ 43.7 $ 43.7