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