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Basis of Presentation - Narrative (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Cash payments for income taxes $ 14.0 $ 49.4  
Cash refunds for income taxes 2.6 $ 6.8  
Prepaid Expenses and Other Current Assets      
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Income taxes receivable $ 9.2   $ 12.0