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Plant Closure Provisions - Movements in Plant Closure and Restructuring Provisions (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Restructuring and Related Activities [Abstract]      
Beginning Balance $ 49.5 $ 46.1  
Charge for the period 1.0 1.6  
Utilized in the period (0.7) (0.9)  
Exchange effect (0.1) 0.1  
Ending Balance 49.7 46.9  
Due within one year (5.3) (4.2) $ (5.9)
Due after one year $ 44.4 $ 42.7 $ 43.6