Commitments and Contingencies (Tables)

12 Months Ended

Nov. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Summary of Future Minimum Rental Commitments Under Non-Cancelable Operating Leases

The future minimum rental commitments under non-cancelable operating leases with initial or remaining terms of one year or more and lease revenue in effect as of November 30, 2015 were as follows:

Year Ending November 30,	Future Minimum Rental Commitments		Future Minimum Rental Income
	(In millions)
2016	$	17.9	$	4.3
2017	15.5		4.1
2018	11.8		3.9
2019	10.6		2.2
2020	9.8		—
Thereafter	26.5		—
	$	92.1	$	14.5

Summary of Environmental Reserve Activity

A summary of the Company’s environmental reserve activity is shown below:

	Aerojet Rocketdyne- Sacramento			Aerojet Rocketdyne- BPOU			Other Aerojet Rocketdyne Sites			Total Aerojet Rocketdyne			Other			Total Environmental Reserve
	(In millions)
November 30, 2012	$	140.5		$	31.2		$	10.8		$	182.5		$	7.0		$	189.5
Additions	9.8			5.1			0.1			15.0			3.8			18.8
Expenditures	(22.3		)	(9.4		)	(2.7		)	(34.4		)	(2.6		)	(37.0		)
November 30, 2013	128.0			26.9			8.2			163.1			8.2			171.3
Additions	24.0			4.5			3.3			31.8			1.9			33.7
Expenditures	(21.6		)	(9.7		)	(3.4		)	(34.7		)	(4.3		)	(39.0		)
November 30, 2014	130.4			21.7			8.1			160.2			5.8			166.0
Additions	44.3			129.7			2.0			176.0			0.6			176.6
Expenditures	(21.7		)	(11.3		)	(2.3		)	(35.3		)	(1.2		)	(36.5		)
November 30, 2015	$	153.0		$	140.1		$	7.8		$	300.9		$	5.2		$	306.1

Summary of Pre-Close Environmental Costs

A summary of the Pre-Close Environmental Costs is shown below (in millions):

Pre-Close Environmental Costs	$	20.0
Amount spent through November 30, 2015	(18.5		)
Amount included as a component of reserves for environmental remediation costs in the consolidated balance sheet as of November 30, 2015	(1.5		)
Remaining Pre-Close Environmental Costs	$	—

Summary of Northrop Agreement Activity

A summary of the Northrop Agreement activity is shown below (in millions):

Total reimbursable costs under the Northrop Agreement	$	189.7
Amount reimbursed to the Company through November 30, 2015	(113.2		)
Potential future cost reimbursements available	76.5
Receivable from Northrop in excess of the annual limitation included in the consolidated balance sheet as of November 30, 2015	(68.7		)
Potential future recoverable amounts available under the Northrop Agreement	$	7.8

Schedule of Environmental Reserves and Recoveries

Summarized financial information for the impact of environmental reserves and recoveries to the consolidated statements of operations is set forth below:

	Year Ended
	2015		2014		2013
	(In millions)
Estimated recoverable amounts under U.S. government contracts and Northrop	$	159.3	$	22.9	$	10.4
Charge to consolidated statement of operations	17.3		10.8		8.4
Total environmental reserve additions	$	176.6	$	33.7	$	18.8