Long-Term Obligations and Notes Payable - Outstanding Borrowings Schedule (Details)	Dec. 31, 2019 USD ($)	Jun. 30, 2020 USD ($)	Dec. 15, 2019 USD ($)	Mar. 30, 2018 USD ($)	Mar. 30, 2018 CAD ($)	May 23, 2017 USD ($)
Debt Instrument [Line Items]
Long-term Debt	$ 2,067,100,000	$ 2,454,900,000
Current portion of long-term debt	36,400,000	33,400,000
Long-term debt, net of current portion	2,030,700,000	2,421,500,000
Term loan
Footnote:
Face amount of debt				$ 700,000,000.0
Debt Instrument, Original Debt Issue Discount				0.50%	0.50%
Maximum borrowing capacity		$ 1,279,500,000
Debt Instrument, Weighted Average Borrowing Rate		3.06%
Delek Term Loan Credit Facility | Term loan
Debt Instrument [Line Items]
Long-term Debt	1,069,500,000	$ 1,250,300,000
Footnote:
Deferred financing costs	3,500,000	3,200,000
Debt discount	12,500,000	26,000,000.0
Hapoalim Term Loan [Member] | Line of credit
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment	100,000
Footnote:
Face amount of debt	40,000,000.0	$ 39,800,000
Debt Instrument, Interest Rate, Effective Percentage		3.61%
Maximum borrowing capacity		$ 100,000,000.0
Debt Instrument, Weighted Average Borrowing Rate		3.18%
Hapoalim Term Loan [Member] | Term loan
Debt Instrument [Line Items]
Long-term Debt	39,500,000	$ 39,400,000
Hapoalim Term Loan [Member] | Senior notes
Footnote:
Deferred financing costs	300,000	200,000
Debt discount	200,000	200,000
DKL Notes | Senior notes
Debt Instrument [Line Items]
Stated interest rate (as percent)						6.75%
Long-term Debt	244,700,000	245,200,000
Footnote:
Deferred financing costs	4,000,000.0	3,600,000
Debt discount	1,300,000	1,200,000
Face amount of debt		$ 250,000,000.0				$ 250,000,000.0
Debt Instrument, Interest Rate, Effective Percentage		7.22%
Promissory Notes
Debt Instrument [Line Items]
Long-term Debt	45,000,000.0	$ 20,000,000.0
Revolving credit facility | Line of credit
Debt Instrument [Line Items]
Long-term Debt	30,000,000.0	$ 100,000,000.0
Footnote:
Debt Instrument, Interest Rate, Effective Percentage		3.44%
Maximum borrowing capacity				$ 1,000,000,000.0	$ 50,000,000.0
Debt Instrument, Weighted Average Borrowing Rate		3.50%
Revolving credit facility | DKL Revolver | Line of credit
Debt Instrument [Line Items]
Long-term Debt	588,400,000	$ 750,000,000.0
Revolving credit facility | Reliant Bank Revolver | Line of credit
Debt Instrument [Line Items]
Stated interest rate (as percent)		4.50%	4.75%
Long-term Debt	$ 50,000,000.0	$ 50,000,000.0
Footnote:
Maximum borrowing capacity		$ 50,000,000.0	$ 30,000,000.0