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Sale of Assets (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) asset | Sep. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($) location | Jun. 30, 2018 USD ($) | Dec. 31, 2016 USD ($) location
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 | Other Income |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Gain sale of assets |  |  | $ 1.2 |  |
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] |  |  |  |  |
Consideration received on sale of assets |  |  | $ 14.7 |  |
Gain sale of assets | $ 4.9 |  |  |  |
Number of locations sold | location |  |  | 3 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail Site | Other Income |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Gain sale of assets |  |  | $ 8.6 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Farm Center | Florida |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration received on sale of assets |  |  | $ 17.4 |  |
Number of locations sold | location |  |  | 4 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Farm Center | Florida | Other Income |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Gain sale of assets |  |  | $ 4.7 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Grain and Agronomy Location | Iowa |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration received on sale of assets |  |  |  |  | $ 54.3
Number of locations sold | location |  |  |  |  | 8

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