Long-Term Obligations and Notes Payable Lines of Credit Narrative (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Dec. 31, 2016	May 26, 2016
Debt Instrument [Line Items]
Long-term Debt		$ 824.9	$ 832.9
Term loan facility [Member] | Secured Debt [Member] | Wells Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt	[1]	57.7	63.6
Long-term Debt, Gross		58.3
Revolving Credit Facility [Member] | Secured Debt [Member] | Wells Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Principal		5.8
Revolving Credit Facility [Member] | Line of Credit [Member] | DKL Revolver [Member]
Debt Instrument [Line Items]
Long-term Debt		392.0	392.6
Revolving Credit Facility [Member] | Line of Credit [Member] | Wells ABL [Member]
Debt Instrument [Line Items]
Maximum Borrowing Capacity under Accordion Feature		725.0
Line of Credit Facility, Remaining Borrowing Capacity		155.8
Limited guaranty provided by Delek		$ 15.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.38%
Revolving Credit Facility [Member] | Line of Credit [Member] | Wells Term Loan [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate		4.70%
Delayed single draw term loan		$ 70.0
Revolving Credit Facility [Member] | Line of Credit [Member] | Wells Revolving Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		450.0
Long-term Debt		$ 30.0	0.0
Debt, Weighted Average Interest Rate		4.50%
Revolving Credit Facility [Member] | Line of Credit [Member] | Reliant Bank Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 17.0
Long-term Debt		$ 17.0	$ 17.0
Line of Credit Facility, Remaining Borrowing Capacity		$ 0.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.50%
Debt Instrument, Interest Rate, Stated Percentage		5.25%
Revolving Credit Facility, Swing Line Loan [Member] | Line of Credit [Member] | Wells Revolving Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 45.0
Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		101.8
Letter of Credit [Member] | Line of Credit [Member] | Wells Revolving Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		200.0
Letters of Credit Outstanding, Amount		$ 92.4
Base Rate [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | Wells ABL [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		base rate
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | Wells ABL [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		LIBOR
Fifth Third Bank [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | DKL Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 700.0
Maximum Borrowing Capacity under Accordion Feature		800.0
Line of Credit Facility, Remaining Borrowing Capacity		300.5
Limited guaranty provided by Delek		$ 102.0
Debt, Weighted Average Interest Rate		3.60%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.50%
Fifth Third Bank [Member] | Letter of Credit [Member] | Line of Credit [Member] | DKL Revolver [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		$ 7.5
Fifth Third Bank [Member] | Base Rate [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | DKL Revolver [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		U.S. base rate
Fifth Third Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | DKL Revolver [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		LIBOR
Fifth Third Bank [Member] | Canadian Dealer Offered Rate (CDOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | DKL Revolver [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		Canadian Dealer Offered Rate
Fifth Third Bank [Member] | Canadian Prime Rate [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | DKL Revolver [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		Canadian prime rate

[1] The Wells Term Loan is net of deferred financing costs of $0.1 million as of both March 31, 2017 and December 31, 2016 and debt discount of $0.5 million as of both March 31, 2017 and December 31, 2016.