Summary of Significant Accounting Policies, (As Restated for fiscal 2014 and 2013) - Schedule of Changes in Carrying Amount of Conditional Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2013
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	$ 24.4	$ 22.9	$ 20.8
Rocketdyne Business Acquisition			1.2
Additions and other, net	3.0	(0.2)	(0.6)
Accretion	1.9	1.7	1.5
Ending Balance	$ 29.3	$ 24.4	$ 22.9