Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Effective tax rate for income from continuing operations	29.70%	24.40%	31.50%	32.50%
Discrete tax expense (benefit)	$ 0.5	$ (1.2)	$ 0.5	$ (1.2)