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Income Taxes (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Income Tax Disclosure [Abstract]          
Effective tax rate 24.90% 28.70% 25.20% 37.70%  
Unrecognized tax benefits $ 12.6   $ 12.6   $ 17.2
Unrecognized tax benefits if recognized that would affect effective tax rate 12.6   12.6   $ 17.2
Unrecognized tax benefits subject to change within the next 12 months $ 2.9   $ 2.9