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Debt (Narrative - Ethanol Production, Partnership Segment, Covenant Compliance, And Restricted Net Assets) (Details)
$ in Millions
12 Months Ended
Sep. 03, 2020
USD ($)
Dec. 31, 2021
USD ($)
$ / gal
Feb. 09, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]        
Restricted assets   $ 109.2    
Green Plains Wood River and Green Plains Shenandoah [Member] | $75.0 Million Delayed Draw Loan Agreement [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount   75.0   $ 75.0
Green Plains SPE LLC [Member] | $125.0 Million Junior Secured Mezzanine Notes Due 2026 [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 125.0    
Interest rate, stated percentage   11.75%    
Debt maturity dates   Feb. 09, 2026    
Debt instrument, term   42 months    
Green Plains SPE LLC [Member] | $125.0 Million Junior Secured Mezzanine Notes Due 2026 [Member] | Elect To Pay In Cash [Member]        
Debt Instrument [Line Items]        
Interest rate, stated percentage   6.00%    
Green Plains SPE LLC [Member] | $125.0 Million Junior Secured Mezzanine Notes Due 2026 [Member] | Paid In Kind [Member]        
Debt Instrument [Line Items]        
Interest rate, stated percentage   6.75%    
Ethanol Production Segment [Member] | Green Plains Wood River and Green Plains Shenandoah [Member] | $75.0 Million Delayed Draw Loan Agreement [Member]        
Debt Instrument [Line Items]        
Debt instrument, draw period   18 months    
Debt instrument, face amount $ 75.0      
Interest rate, stated percentage   5.02%    
Interest rate premium   1.50%    
Debt maturity dates Sep. 01, 2035      
Minimum working capital required for compliance, per gallon | $ / gal   0.10    
Minimum working capital required for compliance   $ 95.8    
Minimum loan to value ratio, percent   50.00%    
Fixed charge coverage ratio   1.25    
Debt service reserve term of future payments   6 months    
Annual principal payments   $ 1.5    
Months before first payment after closing   24 months    
Ethanol Production Segment [Member] | Green Plains Wood River and Green Plains Shenandoah [Member] | $75.0 Million Delayed Draw Loan Agreement [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Interest rate premium   0.00%    
Ethanol Production Segment [Member] | Green Plains Wood River and Green Plains Shenandoah [Member] | $75.0 Million Delayed Draw Loan Agreement [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Interest rate premium   1.50%    
Ethanol Production Segment [Member] | Green Plains SPE LLC [Member] | $125.0 Million Junior Secured Mezzanine Notes Due 2026 [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount     $ 125.0  
Partnership [Member] | Credit Facility [Member]        
Debt Instrument [Line Items]        
Interest rate, basis for effective rate   0%    
Interest rate, basis spread on variable rate, percentage   8.00%    
Debt instrument, debt purchased   $ 50.0    
Debt instrument, face amount   $ 60.0    
Debt maturity dates   Jul. 20, 2026    
Option to prepay per quarter, amount   $ 1.5    
Payments on credit facility   50.0    
Scheduled periodic principal payments   19.5    
Debt payments related to sale of assets   27.5    
Payments in excess of scheduled monthly payments   $ 3.0    
Partnership [Member] | Minimum [Member] | Credit Facility [Member]        
Debt Instrument [Line Items]        
Consolidated debt service coverage ratio   2.50    
Partnership [Member] | Maximum [Member] | Credit Facility [Member]        
Debt Instrument [Line Items]        
Consolidated debt service coverage ratio   1.10