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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 - USD ($)
$ in Millions
3 Months Ended 38 Months Ended
Mar. 31, 2018
Mar. 01, 2018
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
AR1 research and development $ 6.7 $ 62.8
AR1 R&D costs incurred   266.4
AR1 R&D costs net of reimbursements   94.9
Research and development expense   32.1
U.S. Air Force    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Investment percentage of total funding required 66.67%  
Customer funding to offset costs incurred, amount collected   (161.9)
Aerojet Rocketdyne and United Launch Alliance    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Agreement value $ 804.0  
Aerojet Rocketdyne, Inc.    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Intended initial contribution 269.5  
United Launch Alliance    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Intended initial contribution 134.8  
Intended initial contribution, in-kind R&D expense 3.6  
Customer funding to offset costs incurred, amount collected   $ (9.6)
Aerojet Rocketdyne and Partners    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Potential total contribution $ 268.0