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Plant Closure Provisions - Movements in Plant Closure and Restructuring Provisions (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Restructuring and Related Activities [Abstract]      
Beginning Balance $ 39.5 $ 37.7  
Charge for the period 4.4 3.5  
Utilized in the period (1.7) (2.1)  
Exchange effect 0.5 0.1  
Ending Balance 42.7 39.2  
Due within one year (5.9) (5.0) $ (6.7)
Due after one year $ 36.8 $ 34.2 $ 32.8