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Sale of Assets (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) asset | Jun. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) security
Business Acquisition [Line Items] |  |  |  |  |  |
Number of convertible preferred security investments sold | security |  |  |  |  |  | 1
Proceeds from sale of convertible preferred security investments | $ 6.4 |  |  |  |  |
Other Income |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gain on sale of convertible preferred security investments | $ 3.9 |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Grain Assets |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration received on sale of assets |  | $ 11.6 |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Grain Assets | Other Income |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gain sale of assets |  | $ 1.4 |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Grain Elevators | Humboldt, Kenton and Dyer, Tennessee [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration received on sale of assets |  |  |  |  | $ 19.5 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Como Location |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Working capital adjustments |  |  |  |  |  | $ 1.3
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Barge Vessels |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration received on sale of assets |  |  |  | $ 26.9 |  |
Number of assets sold | asset |  |  |  | 50 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Barge Vessels | Other Income |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gain sale of assets |  |  |  | $ 2.4 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail Site |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gain sale of assets |  |  |  | $ 4.9 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Farm Center | MICHIGAN |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration received on sale of assets |  |  | $ 4.6 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Farm Center | MICHIGAN | Other Income |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gain sale of assets |  |  | 2.9 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Grain and Agronomy Location |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration received on sale of assets |  |  | 25.1 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Grain and Agronomy Location | Other Income |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gain sale of assets |  |  | 5.7 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Grain and Agronomy Location | TENNESSEE |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration received on sale of assets |  |  | 0.6 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Grain and Agronomy Location | TENNESSEE | Other Income |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gain sale of assets |  |  | $ 0.6 |  |  |

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