Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Company's effective tax rate	21.80%	21.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 1.3
Reasonable possible increase in unrecognized tax benefits during the next twelve months	10.3
Increase In Unrecognized Tax Benefits That Would Impact Effective Tax Rate	1.1
Unrecognized Tax Benefits, Interest on Income Taxes Expense	0.3
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 8.3		$ 8.0