Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Company's effective tax rate	27.90%	32.70%
Federal statutory income tax rate	35.00%
Increase in gross unrecognized tax benefits	$ 0.8
Increase In Unrecognized Tax Benefits That Would Impact Effective Tax Rate	0.9
Recognized interest expense related to unrecognized tax benefits	0.4
Interest and penalty related to unrecognized tax benefits recorded	6.2		$ 5.8
Reasonable possible increase in unrecognized tax benefits during the next twelve months	$ (7.1)