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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 1,724.6 $ 1,618.7
Work in progress 235.6 200.0
Raw materials 198.3 249.6
Inventories $ 2,158.5 $ 2,068.3