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Related Party Transactions - Other Agreements (Details) - USD ($) $ in Millions			1 Months Ended	12 Months Ended
	Aug. 13, 2020	Mar. 31, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 01, 2020	Feb. 29, 2020
Related Party Transaction [Line Items]
Delek Holdings unit purchases from public				0
Stock repurchased during period, value			$ 5.0
Big spring gathering assets acquisition equity				5,000,000
Limited liability company or limited partnership, members or limited partners, ownership interest, shares				34,700,000
Revolving Credit Facility | DKL Revolver | Fifth Third Bank | Line of Credit
Related Party Transaction [Line Items]
Cash consideration received	$ 45.0
Common- Delek | Limited Partner
Related Party Transaction [Line Items]
Delek Holdings unit purchases from public				(451,822)
Big spring gathering assets acquisition equity				5,000,000
Big Spring Gathering Asset
Related Party Transaction [Line Items]
Big spring gathering assets acquisition equity		5,000,000.0
General Partnership
Related Party Transaction [Line Items]
General partner economic interest, percent	2.00%
Delek US Holdings, Inc.
Related Party Transaction [Line Items]
Delek's limited partner interest				80.00%
Delek Logistics G P
Related Party Transaction [Line Items]
General partner economic interest, percent	2.00%
Delek US Holdings, Inc. | General Partnership
Related Party Transaction [Line Items]
Business acquisition, percentage of voting interests acquired	5.20%
Delek's ownership interest in general partner	100.00%
Delek US Holdings, Inc. | Delek Logistics
Related Party Transaction [Line Items]
Business combination, consideration transferred equity interests issues and issuable, shares	14,000,000.0
Delek
Related Party Transaction [Line Items]
Related party ownership percentage in company		70.50%	70.50%				62.60%	64.50%
Operating and maintenance expenses | Partnership Agreement | General Partner
Related Party Transaction [Line Items]
Payment for management fee				$ 29.4	$ 25.0	$ 21.1

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