Delek Logistics and the Alon Partnership - Narrative (Details) $ in Millions			1 Months Ended	3 Months Ended
	Feb. 07, 2018 USD ($) shares	Nov. 07, 2017 shares	Mar. 31, 2018 USD ($)	Mar. 31, 2019 shares	Mar. 31, 2018 USD ($)
Variable Interest Entity [Line Items]
Deferred Tax Expense, Additional Expense Recorded For Correction					$ 5.5
Conversion ratio	0.49
Transaction costs					3.3
Delek Logistics | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Common units (in shares) | shares				15,294,046
Ownership Interest in Logistics GP (as percent)				94.60%
General partner units (in shares) | shares				498,110
Delek Logistics GP, LLC [Member] | Delek Logistics | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
General partner interest				2.00%
Delek Logistics | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Limited partner interest (as percent)				61.40%
Big Spring Logistics Agreement
Variable Interest Entity [Line Items]
Payments to Acquire Businesses, Gross			$ 170.8
Big Spring Marketing Agreement
Variable Interest Entity [Line Items]
Payments to Acquire Businesses, Gross			144.2
Deferred Tax Assets, Net			$ 98.8		$ 98.8
Alon Partnership | Limited Partner
Variable Interest Entity [Line Items]
General partner interest		81.60%
Limited Partners' Capital Account, Units Issued | shares	5,600,000	51,000,000.0
Deferred Tax Assets, Net	$ 13.5