Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

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 (1)			Total Environmental Reserve
	(In millions)
December 31, 2016	$	210.1		$	126.8		$	8.5		$	345.4		$	4.3		$	349.7
Additions	9.7			3.1			0.9			13.7			0.6			14.3
Expenditures	(17.5		)	(10.8		)	(1.0		)	(29.3		)	(0.3		)	(29.6		)
September 30, 2017	$	202.3		$	119.1		$	8.4		$	329.8		$	4.6		$	334.4

______

(1) Related to the Company's legacy business operations that are primarily non-recoverable from the U.S. government.

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 September 30, 2017	(123.7		)
Potential future cost reimbursements available	66.0
Less: Receivable from Northrop included in the unaudited condensed consolidated balance sheet as of September 30, 2017	(66.0		)
Potential future recoverable amounts available under the Northrop Agreement	$	—

Summary of Financial Information for the Impact of Environmental Reserves and Recoveries

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

	Three months ended September 30,				Nine months ended September 30,
	2017		2016		2017		2016
	(In millions)
Estimated recoverable amounts under U.S. government contracts	$	4.4	$	53.7	$	12.1	$	60.0
Expense to unaudited condensed consolidated statement of operations	0.5		16.4		2.2		16.9
Total environmental reserve adjustments	$	4.9	$	70.1	$	14.3	$	76.9