Balance Sheet Accounts - Schedule of Other Noncurrent Assets, net (Details) - USD ($) $ in Millions	May. 31, 2015	Nov. 30, 2014
Other Noncurrent Assets [Line Items]
Deferred financing costs	$ 16.4	$ 18.5
Recoverable from the U.S. government for conditional asset retirement obligations	15.9	17.7
Grantor trust	11.8	11.2
Notes receivable, net	9.0	0.0
Other	8.8	8.7
Other noncurrent assets, net	109.8	91.6
UTC [Member]
Other Noncurrent Assets [Line Items]
Indemnification receivable from UTC, net	7.0	7.5
Business Integration Costs [Member]
Other Noncurrent Assets [Line Items]
Recoverable from the U.S. government for Rocketdyne Business integration costs	31.3	28.0
Competitive Improvement Program Severance Obligations [Member]
Other Noncurrent Assets [Line Items]
Recoverable from the U.S. government for Rocketdyne Business integration costs	$ 9.6	$ 0.0