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Long-Term Obligations and Notes Payable - Outstanding Borrowings Schedule (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt $ 2,067.1 $ 1,783.3
Less: Current portion of long-term debt and notes payable 36.4 32.0
Long-term debt, net of current portion 2,030.7 1,751.3
Promissory Notes    
Debt Instrument [Line Items]    
Long-term debt 45.0 70.0
Senior Notes | Hapoalim Term Loan    
Debt Instrument [Line Items]    
Deferred financing costs 0.3  
Debt discount 0.2  
Senior Notes | DKL Notes    
Debt Instrument [Line Items]    
Long-term debt 244.7 243.7
Deferred financing costs 4.0 4.8
Debt discount 1.3 1.5
Secured Debt | Delek Term Loan Credit Facility    
Debt Instrument [Line Items]    
Long-term debt 1,069.5 682.9
Deferred financing costs 3.5 3.5
Debt discount 12.5 8.4
Secured Debt | Hapoalim Term Loan    
Debt Instrument [Line Items]    
Long-term debt 39.5 0.0
Revolving Credit Facility | Line of Credit    
Debt Instrument [Line Items]    
Long-term debt 30.0 300.0
Revolving Credit Facility | Line of Credit | Delek Logistics Credit Facility    
Debt Instrument [Line Items]    
Long-term debt 588.4 456.7
Revolving Credit Facility | Line of Credit | Reliant Bank Revolver    
Debt Instrument [Line Items]    
Long-term debt $ 50.0 $ 30.0