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Equity Method Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Oct. 01, 2020
Sep. 01, 2019
Dec. 31, 2020
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]        
Reduction in other assets $ (69.7)      
Reduction in accumulated other comprehensive income $ (10.7)      
Green Plains Cattle Company LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Disposal Groups Including Discontinued Operations, Percent Sold   50.00%    
Percent membership interest sold   50.00%    
All Others [Member]        
Schedule of Equity Method Investments [Line Items]        
Investment balance in joint venture     $ 4.0 $ 7.2
Green Plains Cattle Company LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Disposal Groups Including Discontinued Operations, Percent Sold 50.00% 50.00% 50.00%  
Percent membership interest sold 50.00% 50.00% 50.00%  
Assets to be disposed of in the sale $ 80.5      
Reduction in other assets (69.7)      
Reduction in accumulated other comprehensive income $ (10.7)