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Basis of Presentation - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Cash payments for income taxes $ 26.4 $ 9.2  
Cash refunds for income taxes 0.7 $ 7.1  
Prepaid Expenses and Other Current Assets      
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Income taxes receivable $ 27.9   $ 11.7