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Plant Closure Provisions - Movements in Plant Closure and Restructuring Provisions (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring and Related Activities [Abstract]      
Beginning Balance $ 49.3 $ 49.5 $ 46.1
Charge for the period excluding restructuring 5.1 4.4 6.8
Restructuring 7.5 0.0 0.0
Utilized in the period (4.1) (4.4) (3.1)
Exchange effect 0.7 (0.2) (0.3)
Ending Balance 58.5 49.3 49.5
Due within one year (6.6) (5.6) (5.9)
Due after one year $ 51.9 $ 43.7 $ 43.6