Long-Term Obligations and Notes Payable Outstanding Borrowings Schedule (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt		$ 1,783.3	$ 1,465.6
Less: Current portion of long-term debt and notes payable		32.0	590.2
Long-term debt, net of current portion		1,751.3	875.4
Promissory Notes
Debt Instrument [Line Items]
Long-term debt		70.0	95.1
Alon Retail Credit Facilities
Debt Instrument [Line Items]
Debt discount			2.4
Line of Credit | Lion Term Loan
Debt Instrument [Line Items]
Long-term debt	[1]	0.0	203.4
Line of Credit | Alon Partnership Credit Facility
Debt Instrument [Line Items]
Long-term debt		0.0	100.0
Line of Credit | Alon Term Loan Credit Facilities
Debt Instrument [Line Items]
Debt discount			0.6
Line of Credit | Alon Retail Credit Facilities
Debt Instrument [Line Items]
Long-term debt	[2]	0.0	86.1
Senior Notes | DKL Notes
Debt Instrument [Line Items]
Long-term debt	[3]	243.7	242.7
Deferred financing costs		4.8	5.6
Debt discount		1.5	1.7
Senior Notes | Convertible Notes
Debt Instrument [Line Items]
Long-term debt	[4]	0.0	146.0
Debt discount			4.0
Secured Debt | Delek Term Loan Credit Facility
Debt Instrument [Line Items]
Long-term debt	[5]	682.9	0.0
Deferred financing costs		3.5
Debt discount		8.4
Secured Debt | Wells Term Loan
Debt Instrument [Line Items]
Debt discount			0.3
Secured Debt | Lion Term Loan
Debt Instrument [Line Items]
Deferred financing costs			2.1
Debt discount			0.8
Secured Debt | Alon Partnership Term Loan
Debt Instrument [Line Items]
Long-term debt		0.0	237.5
Secured Debt | Alon Term Loan Credit Facilities
Debt Instrument [Line Items]
Long-term debt	[6]	0.0	72.4
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Long-term debt		300.0	0.0
Revolving Credit Facility | Line of Credit | Delek Logistics Credit Facility
Debt Instrument [Line Items]
Long-term debt		456.7	179.9
Revolving Credit Facility | Line of Credit | Wells Revolving Loan
Debt Instrument [Line Items]
Long-term debt		0.0	45.0
Revolving Credit Facility | Line of Credit | Reliant Bank Revolver
Debt Instrument [Line Items]
Long-term debt		30.0	17.0
Term loan facility | Secured Debt | Wells Term Loan
Debt Instrument [Line Items]
Long-term debt	[7]	$ 0.0	$ 40.5

[1] The Lion Term Loan Facility was extinguished on March 30, 2018, as further discussed below, and was net of deferred financing costs of $2.1 million and debt discount of $0.8 million at December 31, 2017.

[2] The Alon Retail Credit Facilities were extinguished on March 30, 2018, as further discussed below, and were net of debt discount of $2.4 million at December 31, 2017.

[3] 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.

[4] The Convertible Notes were extinguished on September 17, 2018, as further discussed below, and were net of debt discount of $4.0 million at December 31, 2017.

[5] The Term Loan Credit Facility is net of deferred financing costs of $3.5 million and debt discount of $8.4 million at December 31, 2018.

[6] The Alon Term Loan Credit Facilities were extinguished on March 30, 2018, as further discussed below, and were net of debt discount of $0.6 million at December 31, 2017.

[7] 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.