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Basis of Presentation - Narrative (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Cash payments for income taxes $ 54.5 $ 28.4  
Cash refunds for income taxes 7.7 $ 14.0  
Prepaid Expenses and Other Current Assets      
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Income taxes receivable $ 25.5   $ 11.7