Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Company's effective tax rate	27.00%	31.50%	27.40%	32.10%
Federal statutory income tax rate			35.00%
Increase in gross unrecognized tax benefits	$ 2.7		$ 1.9
Increase In Unrecognized Tax Benefits That Would Impact Effective Tax Rate	2.9		1.9
Recognized interest expense related to unrecognized tax benefits	(0.1)		0.3
Interest and penalty related to unrecognized tax benefits recorded	6.1		6.1		$ 5.8
Reasonable possible increase in unrecognized tax benefits during the next twelve months	$ (3.4)		$ (3.4)