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Inventories (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 918.8 $ 869.3
Work-in-process 129.0 120.8
Finished goods 334.6 324.8
Reserves (116.1) (109.2)
Inventories $ 1,266.3 [1] $ 1,205.7
[1] Unaudited.