Income Taxes - Schedule of Income Tax Provision (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014
Income Tax Disclosure [Abstract]
Federal and state current income tax expense			$ 16.8	$ 4.2
Net deferred benefit			(0.6)	(4.1)
Research and development credits			(1.5)	1.1
Income tax provision	$ 21.3	$ (0.6)	14.7	1.2
Cash paid for income taxes			$ 10.2	$ 1.7