Delek Logistics and the Alon Partnership - Narrative (Details) $ in Millions			1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 06, 2018 shares	Jul. 01, 2017	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) shares	Dec. 31, 2019 shares	Dec. 31, 2018 USD ($) shares	Feb. 07, 2018 USD ($) shares	Dec. 31, 2017 shares
Variable Interest Entity [Line Items]
Common stock, shares, issued (in shares) | shares				90,478,075	90,987,025	90,478,075
Acquisition related transaction costs | $						$ 3.0
Additional deferred tax expense recorded | $				$ 5.5
Alon USA Energy, Inc.
Variable Interest Entity [Line Items]
Limited partners' capital account, units outstanding (in shares) | shares	51,000,000.0
Ownership interest in general partner		100.00%
Delek Logistics | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Limited partners' capital account, units outstanding (in shares) | shares					15,294,046
Ownership interest in general partner					94.60%
General partner units (in units) | shares					498,482
Alon Partnership | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Limited partners' capital account, units outstanding, held by public, percent								18.40%
Alon Partnership | Variable Interest Entity, Primary Beneficiary | Other Ownership Interest
Variable Interest Entity [Line Items]
Limited partners' capital account, units outstanding (in shares) | shares								11,500,000
Delek Logistics | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Members or limited partners, ownership interest (percentage)					61.40%
Delek Logistics GP, LLC | Delek Logistics | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
General partner ownership interest in delek logistics					2.00%
Big Spring Logistics Agreement
Variable Interest Entity [Line Items]
Payment to acquire business | $			$ 170.8
Alon Partnership | Limited Partner
Variable Interest Entity [Line Items]
Deferred tax assets, net of valuation allowance | $							$ 13.5
Alon Partnership | Alon USA Energy, Inc.
Variable Interest Entity [Line Items]
Members or limited partners, ownership interest (percentage)		81.60%
Alon Partnership | Variable Interest Entity, Primary Beneficiary | Alon USA Energy, Inc.
Variable Interest Entity [Line Items]
Members or limited partners, ownership interest (percentage)	81.60%
Big Spring Marketing Agreement
Variable Interest Entity [Line Items]
Payment to acquire business | $			$ 144.2
Deferred tax assets, net of valuation allowance | $				$ 98.8		$ 98.8
New Delek Common Stock | Alon USA Energy, Inc.
Variable Interest Entity [Line Items]
Fixed exchange ratio of shares							0.49
Common stock, shares, issued (in shares) | shares							5,600,000