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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Income Tax Disclosure [Abstract]          
Effective tax rate 15.10% 20.20% 16.20% 17.80%  
Amount of gross unrecognized tax benefits excluding interest and penalties $ 47.7   $ 47.7   $ 47.0
Accrued interest on unrecognized tax benefits $ 0.9   0.9   $ 0.7
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions     $ 4.1