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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2018
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

Total
Environmental
Reserve
 
(In millions)
December 31, 2017
$
206.5


$
116.4


$
13.7

 
$
336.6

 
$
4.8

 
$
341.4

Additions
8.9


0.8


0.4

 
10.1

 
0.5

 
10.6

Expenditures
(10.0
)

(6.8
)

(1.0
)
 
(17.8
)
 
(0.5
)
 
(18.3
)
June 30, 2018
$
205.4


$
110.4


$
13.1


$
328.9


$
4.8


$
333.7
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 June 30, 2018
(128.2
)
Potential future cost reimbursements available
$
61.5
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 June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
 
 
Estimated recoverable amounts under U.S. government contracts
$
3.7

 
$
3.8

 
$
7.8

 
$
7.7

Expense to unaudited condensed consolidated statement of operations
1.4

 
0.9

 
2.8

 
1.7

Total environmental reserve adjustments
$
5.1

 
$
4.7

 
$
10.6

 
$
9.4