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Balance Sheet Details and Other Financial Information - Inventory (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventory:    
Raw materials $ 80.9 $ 54.8
Work-in-process 19.7 13.4
Finished goods 140.6 114.1
Total inventory $ 241.2 $ 182.3