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Summary of Significant Accounting Policies - Summary of Inventories (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Raw materials $ 869.3 $ 746.3
Work-in-process 120.8 106.4
Finished goods 324.8 262.3
Reserves (109.2) (94.4)
Inventories $ 1,205.7 $ 1,020.6