Balance Sheet Accounts - Schedule of Other Current Assets, net (Details) - USD ($) $ in Millions	May. 31, 2015	Nov. 30, 2014
Other Current Assets [Line Items]
Prepaid expenses	$ 9.5	$ 11.3
Receivables, net	15.5	4.5
Income taxes	1.4	2.1
Indemnification receivable from UTC	173.7	172.9
Other	6.7	8.7
Other current assets, net	45.4	38.0
UTC [Member]
Other Current Assets [Line Items]
Indemnification receivable from UTC	0.7	0.9
Business Integration Costs [Member]
Other Current Assets [Line Items]
Recoverable from the U.S. government for Rocketdyne Business integration costs (see Note 4(f))	10.5	10.5
Competitive Improvement Program Severance Obligations [Member]
Other Current Assets [Line Items]
Recoverable from the U.S. government for Rocketdyne Business integration costs (see Note 4(f))	$ 1.1	$ 0.0