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Basis of Presentation - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Cash payments for income taxes $ 8.5 $ 26.4  
Cash refunds for income taxes 2.4 $ 0.7  
Prepaid Expenses and Other Current Assets      
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Income taxes receivable $ 15.4   $ 12.0