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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Summary of Environmental Reserve Activity The following table summarizes the Company’s environmental reserve activity:
Aerojet
Rocketdyne-
Sacramento		Aerojet
Rocketdyne-
BPOU		Other
Aerojet
Rocketdyne
Sites		Total
Aerojet
Rocketdyne		OtherTotal
Environmental
Reserve
 (In millions)
December 31, 2020$208.4 $76.2 $10.6 $295.2 $5.4 $300.6 
Additions/Adjustments24.2 2.6 3.1 29.9 0.1 30.0 
Expenditures(15.8)(9.4)(1.7)(26.9)(0.4)(27.3)
September 30, 2021$216.8 $69.4 $12.0 $298.2 $5.1 $303.3 
Summary of Northrop Agreement Activity The following table summarizes the Northrop Agreement activity (in millions):
Total reimbursable costs under the Northrop Agreement$189.7 
Amount reimbursed to the Company through September 30, 2021(147.7)
Receivable from Northrop included in the unaudited balance sheet at September 30, 2021$42.0 
Summary of Financial Information for the Impact of Environmental Reserves and Recoveries The following table summarizes the financial information for the impact of environmental reserves and recoveries to the unaudited condensed consolidated statements of operations:
Three months ended September 30,Nine months ended September 30,
 2021202020212020
 (In millions)
Expense to unaudited condensed consolidated statements of operations$2.4 $3.1 $3.5 $3.3