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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
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 December 31, 2017 were as follows:
 
Year Ending December 31,
Future Minimum
Rental Commitments 
 
Future Minimum
Rental Income 
 
(In millions)
2018
$
15.1

 
$
4.8

2019
14.6

 
2.5

2020
14.1

 
0.7

2021
14.2

 
0.7

2022
13.2

 
0.2

Thereafter
23.9

 
—

 
$
95.1

 
$
8.9
Summary of Environmental Reserve Activity
A summary of the Company’s environmental reserve activity:
 
Aerojet
Rocketdyne-
Sacramento
 
Aerojet
Rocketdyne-
BPOU
 
Other
Aerojet
Rocketdyne
Sites
 
Total
Aerojet
Rocketdyne
 
Other
 
Total
Environmental
Reserve
 
(In millions)
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

Additions
0.5

 
—

 
—

 
0.5

 
—

 
0.5

Expenditures
(0.9
)
 
(3.4
)
 
—

 
(4.3
)
 
—

 
(4.3
)
December 31, 2015
152.6

 
136.7

 
7.8

 
297.1

 
5.2

 
302.3

Additions
80.0

 
3.5

 
3.9

 
87.4

 
—

 
87.4

Expenditures
(22.5
)
 
(13.4
)
 
(3.2
)
 
(39.1
)
 
(0.9
)
 
(40.0
)
December 31, 2016
210.1

 
126.8

 
8.5

 
345.4

 
4.3

 
349.7

Additions
19.2

 
3.3

 
8.0

 
30.5

 
0.8

 
31.3

Expenditures
(22.8
)
 
(13.7
)
 
(2.8
)
 
(39.3
)
 
(0.3
)
 
(39.6
)
December 31, 2017
$
206.5

 
$
116.4

 
$
13.7

 
$
336.6

 
$
4.8

 
$
341.4
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 through December 31, 2017
(125.2
)
Receivable from Northrop included in the consolidated balance sheet as of December 31, 2017
$
64.5
Schedule of Environmental Reserves and Recoveries
Summarized financial information for the impact of environmental reserves and recoveries to the consolidated statements of operations were as follows:
 
Year Ended
 
One month ended
 
December 31,
 
December 31,
 
November 30,
 
December 31,
 
2017
 
2016
 
2015
 
2015
 
(In millions)
Estimated recoverable amounts from U.S. government contracts and other third parties
$
23.1

 
$
69.1

 
$
159.3

 
$
0.6

Expense (benefit) to consolidated statement of operations
8.2

 
18.3

 
17.3

 
(0.1
)
Total environmental reserve adjustments
$
31.3

 
$
87.4

 
$
176.6

 
$
0.5