Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 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	2.9			1.5			0.1			4.5			0.2		4.7
Expenditures	(5.2		)	(3.2		)	(0.5		)	(8.9		)	—		(8.9		)
March 31, 2017	$	207.8		$	125.1		$	8.1		$	341.0		$	4.5	$	345.5

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(1) Related to the Company's legacy business operations that are primarily non-recoverable environmental remediation expenses 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 March 31, 2017	(120.7		)
Potential future cost reimbursements available	69.0
Less: Receivable from Northrop included in the unaudited condensed consolidated balance sheet as of March 31, 2017	(67.7		)
Potential future recoverable amounts available under the Northrop Agreement	$	1.3

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 March 31,
	2017		2016
	(In millions)
Estimated recoverable amounts under U.S. government contracts	$	3.9	$	4.6
Expense to unaudited condensed consolidated statement of operations	0.8		0.3
Total environmental reserve adjustments	$	4.7	$	4.9