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Balance Sheet Details and Other Financial Information - Other Long-Term Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Income taxes—long-term $ 286.8 $ 84.9
Other long-term liabilities 40.3 27.7
Total other long-term liabilities $ 327.1 $ 112.6