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Basis of Presentation - Narrative (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Cash payments for income taxes $ 49.4 $ 23.5  
Cash refunds for income taxes 6.8 $ 12.2  
Prepaid Expenses and Other Current Assets      
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Income taxes receivable $ 43.0   $ 11.7