Retirement Benefits, (As Restated for fiscal 2014 and 2013) - Narrative - Plan Descriptions (Details) - USD ($) $ in Millions	12 Months Ended
	Nov. 30, 2016	Nov. 30, 2015		Nov. 30, 2014		Nov. 30, 2013	Aug. 31, 2015	May. 31, 2015	Feb. 28, 2015	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	Jun. 14, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan assets, total		$ 964.1		$ 1,163.1
Unfunded pension obligation		566.2		482.8			$ 471.9	$ 475.5	$ 479.1	$ 257.7	$ 262.1	$ 266.5
Accumulated prepayment credits		8.3
Cost of 401(k) plan		$ 24.9		24.4		$ 14.7
First 3% of Compensation Contributed [Member]
Defined Benefit Plan Disclosure [Line Items]
Percent of company matching compensation contributed		100.00%
Percent of participant's compensation contributed		3.00%
Next 3% of Compensation Contributed [Member]
Defined Benefit Plan Disclosure [Line Items]
Percent of company matching compensation contributed		50.00%
Percent of participant's compensation contributed		3.00%
Rocketdyne Business [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension liability													$ 5.3
Subsidiary Concentration Risk [Member] | Unfunded Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Risk percentage		83.00%
Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected cash contributions	$ 23.0
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan assets, total		$ 964.1		1,163.1		1,249.2
Projected benefit obligations, total		1,549.5	[1]	1,666.3	[1]	$ 1,538.6
Unfunded pension obligation		$ 566.2	[1]	$ 482.8

[1] Pension benefit obligation includes $19.2 million and $20.4 million as of November 30, 2015 and 2014, respectively, for the non-qualified plan.