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Related Party Transactions (Investment Balance in Company's Equity Method Investees) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Jul. 31, 2013
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments	$ 23,857		$ 242,326
The Andersons Albion Ethanol LLC (a)
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments	0		50,382
Percentage of company ownership interest (percentage)		55.00%
The Andersons Clymers Ethanol LLC (a)
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments	0		24,242
Percentage of company ownership interest (percentage)		39.00%
The Andersons Marathon Ethanol LLC (a)
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments	$ 0		14,841
Percentage of company ownership interest (percentage)	33.00%	33.00%
Lansing Trade Group, LLC (b)
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments	$ 0		$ 101,715
Percentage of company ownership interest (percentage)			32.50%
Thompsons Limited
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments	0		$ 48,987
Percentage of company ownership interest (percentage)				50.00%
Providence Grain
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments	$ 12,424		0
Percentage of company ownership interest (percentage)	37.80%
Quadra Commodities S.A.
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments	$ 5,574		0
Percentage of company ownership interest (percentage)		17.70%
Other
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments	$ 5,859		$ 2,159
Maximum | Other
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Percentage of company ownership interest (percentage)		52.00%
Minimum | Other
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Percentage of company ownership interest (percentage)		5.00%

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- Definition

Equity method investment company's investment balance in each equity method investees by entity.

+ References

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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