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Income Taxes (Narrative) (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]          
Company's effective tax rate 18.40% 20.90% 19.60% 21.60%  
Unrecognized Tax Benefits, Period Increase (Decrease) $ 0.5   $ 0.4    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 0.6   0.6    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 0.2   0.2    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 7.8   7.8   $ 7.5
Reasonable possible increase in unrecognized tax benefits during the next twelve months $ 10.1   $ 10.1