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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Income Tax Disclosure [Abstract]          
Effective tax rate 20.40% 15.70% 17.60% 17.00%  
Amount of gross unrecognized tax benefits excluding interest and penalties $ 47.3   $ 47.3   $ 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     $ 3.8