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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2022
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, 2021$214.7 $64.7 $11.8 $291.2 $5.2 $296.4 
Additions/Adjustments3.8 (0.4)0.2 3.6 — 3.6 
Expenditures(3.3)(2.7)(0.3)(6.3)— (6.3)
March 31, 2022$215.2 $61.6 $11.7 $288.5 $5.2 $293.7 
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 March 31, 2022(150.7)
Receivable from Northrop included in the unaudited balance sheet at March 31, 2022$39.0 
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 March 31,
 20222021
 (In millions)
Expense to unaudited condensed consolidated statements of operations$0.4 $0.5