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Basis of Presentation and Nature of Operations - AR1 Research and Development (Details) - U.S. Air Force - U.S. Government Contractual Arrangements - Liquid Booster Engine Development Project
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
AR1 research and development $ 49.3
AR1 R&D costs incurred 205.9
AR1 R&D costs net of reimbursements 81.4
AR1 R&D costs expensed and not applied to contracts (32.1)
Aerojet Rocketdyne and United Launch Alliance  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Agreement value 804.0
Potential total contribution $ 536.0
U.S. Air Force  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Investment percentage of total funding required 66.67%
Intended initial contribution $ 174.0
Customer funding to offset costs incurred, amount collected (119.1)
Aerojet Rocketdyne, Inc.  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Intended initial contribution 81.2
United Launch Alliance  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Intended initial contribution 5.8
Customer funding to offset costs incurred, amount collected (5.4)
Aerojet Rocketdyne and Partners  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Potential total contribution 268.0
U.S. Air Force and United Launch Alliance  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Customer funding to offset costs incurred 124.5
Customer funding to offset costs incurred, amount collected $ (109.5)