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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Income Taxes [Line Items]      
Income tax expense (benefit) $ 6.6 $ 8.2  
Current income tax benefit 2.6    
Other tax benefit 0.8    
Tax reduction attributable to the release of tax reserves 1.8    
Unrecognized tax benefits 0.0   $ 1.8
Accrued Interest included in unrecognized tax benefits     $ 0.3
Unrecognized tax benefits released during the period $ 1.8    
Income tax examination description With a few exceptions, we are no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2016.    
Non Deductible Stock Based Compensation      
Income Taxes [Line Items]      
Income tax expense (benefit) $ 7.3    
State [Member]      
Income Taxes [Line Items]      
Valuation allowance 16.3    
Income tax expense (benefit) 2.6    
Base Erosion and Anti-Abuse Tax ("BEAT") [Member]      
Income Taxes [Line Items]      
Income tax expense (benefit) 3.8    
Unremitted Foreign Earnings [Member]      
Income Taxes [Line Items]      
Income tax expense (benefit) $ 1.9