Business Acquisitions (Fair Value of Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands			12 Months Ended
	Oct. 01, 2019	Jan. 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2007
Business Acquisition [Line Items]
Goodwill			$ 135,360	$ 6,024	$ 6,024	$ 63,934
Removal of preexisting ownership interest, including associated cumulative translation adjustment		$ (159,459)	$ (284,121)	$ 0	$ 0
Pretax loss on derecognition of preexisting ownership interest		1,072
Noncontrolling interest, ownership percentage by noncontrolling owners							34.00%
LTG
Business Acquisition [Line Items]
Cash and cash equivalents		21,525
Accounts receivable		320,467
Inventories		456,963
Commodity derivative assets - current		82,595
Other current assets		27,474
Commodity derivative assets - noncurrent		13,576
Goodwill		126,610
Other intangible assets		112,900
Right of use asset		37,894
Equity method investments		28,728
Other assets, net		5,355
Property, plant and equipment, net		171,717
Total Assets Acquired		1,405,804
Short-term debt		218,901
Trade and other payables		303,321
Commodity derivative liabilities - current		29,024
Customer prepayments and deferred revenue		99,530
Accrued expense and other current liabilities		66,109
Other long-term liabilities, including commodity derivative liabilities - noncurrent		3,175
Long-term debt, including current maturities		21,193
Long-term debt, including current maturities		161,689
Deferred income taxes		15,531
Total Liabilities Assumed		918,473
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		$ 487,331
The Andersons Marathon Holdings LLC
Business Acquisition [Line Items]
Cash and cash equivalents	$ 47,042
Accounts receivable	12,175
Inventories	31,765
Other current assets	2,638
Goodwill	2,726
Right of use asset	5,200
Other assets, net	861
Property, plant and equipment, net	321,380
Total Assets Acquired	423,787
Trade and other payables	13,461
Accrued expense and other current liabilities	3,011
Other long-term liabilities, including commodity derivative liabilities - noncurrent	209
Long-term debt, including current maturities	2,230
Long-term debt, including current maturities	47,886
Total Liabilities Assumed	66,797
Fair value of acquired assets and assumed liabilities	174,135
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest	182,855
Removal of preexisting ownership interest, including associated cumulative translation adjustment	(88,426)
Pretax loss on derecognition of preexisting ownership interest	$ 36,286
The Andersons Marathon Holdings LLC
Business Acquisition [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners	49.90%
Noncontrolling interest ownership percentage by parent	50.10%
The Andersons Marathon Holdings LLC
Business Acquisition [Line Items]
Noncontrolling interest ownership percentage by parent	50.10%