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Equity Method Investments (Narrative) (Details) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2020 USD ($) | Sep. 01, 2019 | Dec. 31, 2020 | Dec. 31, 2020 item
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% |  |
Number of cattle capacity to support | item |  |  |  | 355,000
Percent membership interest sold |  | 50.00% |  |
Number of bushels of grain storage capacity | item |  |  |  | 24,100,000
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) |  |  |

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