Long-Term Obligations and Notes Payable Lines of Credit Narrative (Details) $ in Millions					3 Months Ended	12 Months Ended
		Oct. 26, 2018	Mar. 30, 2018 USD ($)	May 23, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 28, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 20, 2018 USD ($)	Mar. 30, 2018 CAD ($)
Debt Instrument [Line Items]
Loss on extinguishment of debt						$ (9,100,000)	$ 0	$ 0
Long-term debt					$ 1,783,300,000	1,783,300,000	1,465,600,000
Senior Notes | DKL Notes
Debt Instrument [Line Items]
Debt instrument, face amount				$ 250,000,000.0						$ 250,000,000.0
Long-term debt	[1]				243,700,000	$ 243,700,000	242,700,000
Interest rate, stated percentage				6.75%
Percentage of redemption price redeemed						10100.00%
Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 300,000,000.0									$ 10.0
Secured Debt
Debt Instrument [Line Items]
Debt instrument, face amount			$ 700,000,000.0
Line of credit facility, maximum borrowing capacity					$ 694,800,000	$ 694,800,000
Original debt issue discount			0.50%									0.50%
Proceeds from issuance of secured debt			$ 300,000,000.0
Loss on extinguishment of debt						$ 9,100,000
Periodic payment, principal			$ 1,750,000
Prepayment premium (percentage)			1.00%									1.00%
Weighted average borrowing rate (percentage)					4.77%	4.77%
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 1,000,000,000.0									$ 50.0
Weighted average borrowing rate (percentage)					5.80%	5.80%
Long-term debt					$ 300,000,000.0	$ 300,000,000.0	0
Issued letters of credit					179,400,000	179,400,000
Unused credit commitments					520,600,000	520,600,000
Revolving Credit Facility | Line of Credit | Delek Logistics Credit Facility
Debt Instrument [Line Items]
Long-term debt					456,700,000	456,700,000	179,900,000
Revolving Credit Facility | Line of Credit | Wells ABL
Debt Instrument [Line Items]
Maximum borrowing capacity under accordion feature			725,000,000.0
Principal amount of the Holdings Note			15,000,000.0
Revolving Credit Facility | Line of Credit | Wells Revolving Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			450,000,000.0
Long-term debt					0	$ 0	45,000,000.0
Revolving Credit Facility | Line of Credit | Reliant Bank Revolver
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 17,000,000.0							$ 30,000,000.0
Unused capacity, commitment fee percentage						0.50%
Long-term debt					30,000,000.0	$ 30,000,000.0	17,000,000.0
Unused credit commitments					0	0
Interest rate, stated percentage				5.25%							4.75%
Revolving Credit Facility | Secured Debt | Wells Term Loan
Debt Instrument [Line Items]
Periodic payment, principal			5,800,000
Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					179,400,000	179,400,000
Long-term line of credit					0	0
Letter of Credit | Line of Credit | Wells Revolving Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			200,000,000.0
Revolving Credit Facility, Swing Line Loan | Line of Credit | Wells Revolving Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 45,000,000.0
Term loan facility | Secured Debt | Wells Term Loan
Debt Instrument [Line Items]
Long-term debt	[2]				0	$ 0	40,500,000
Redemption, period one | Senior Notes | DKL Notes
Debt Instrument [Line Items]
Percentage of principal amount redeemed				3500.00%
Percentage of redemption price redeemed				10675.00%
Redemption, period two | Senior Notes | DKL Notes
Debt Instrument [Line Items]
Percentage of redemption price redeemed				10506.30%
Redemption, period three | Senior Notes | DKL Notes
Debt Instrument [Line Items]
Percentage of redemption price redeemed				10337.50%
Redemption, period four | Senior Notes | DKL Notes
Debt Instrument [Line Items]
Percentage of redemption price redeemed				10168.80%
Redemption, period five | Senior Notes | DKL Notes
Debt Instrument [Line Items]
Percentage of redemption price redeemed				10000.00%
Fifth Third Bank | Revolving Credit Facility | Line of Credit | Delek Logistics Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							700,000,000.0		$ 850,000,000.0
Unused capacity, commitment fee percentage						0.50%
Unused credit commitments					393,300,000	$ 393,300,000
Accordion feature							100,000,000.0
Long-term line of credit							$ 179,900,000
Maximum borrowing capacity under accordion feature									$ 1,000,000,000.0
Principal amount of the Holdings Note					$ 102,000,000.0	$ 102,000,000.0
Weighted average interest rate (percentage)					5.40%	5.40%
Fifth Third Bank | Letter of Credit | Line of Credit | Delek Logistics Credit Facility
Debt Instrument [Line Items]
Issued letters of credit										$ 0
Base Rate [Member] | Secured Debt
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1.50%
Base Rate [Member] | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			0.25%
London Interbank Offered Rate (LIBOR) | Secured Debt
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2.50%
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1.25%
Minimum | Secured Debt
Debt Instrument [Line Items]
Prepayment as a variable percentage of excess cash flow			50.00%									50.00%
Minimum | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage			0.25%
Minimum | Base Rate [Member] | Secured Debt
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		1.25%
Minimum | Base Rate [Member] | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					0.25%
Minimum | London Interbank Offered Rate (LIBOR) | Secured Debt
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.25%
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					1.25%
Maximum | Secured Debt
Debt Instrument [Line Items]
Prepayment as a variable percentage of excess cash flow			0.00%									0.00%
Maximum | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage			0.375%			0.375%
Maximum | Base Rate [Member] | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					0.75%
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					1.75%

[1] The Delek Logistics Notes are net of deferred financing costs of $4.8 million and $5.6 million, respectively, and debt discount of $1.5 million and $1.7 million, respectively, at December 31, 2018 and December 31, 2017.

[2] The Wells Term Loan was extinguished on March 30, 2018, as further discussed below, and was net of deferred financing costs of a nominal amount and debt discount $0.3 million at December 31, 2017.