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BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION - Inventory (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Raw materials $ 129.5 $ 80.9
Work-in-process 35.9 19.7
Finished goods 166.1 140.6
Total inventory $ 331.5 $ 241.2