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Equity Based Compensation - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 05, 2020	May 04, 2020	May 18, 2018	May 05, 2016
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax expense (benefit) of equity-based compensation	$ 2.3	$ (2.5)	$ (2.2)
Exercises in period, total intrinsic value	$ 8.4	$ 27.0	$ 39.4
Exercise of equity-based awards (shares)	369,843	508,950	580,455
Shares paid for tax withholding for share based compensation (in shares)	167,094	564,090	1,027,398
Taxes paid due to the net settlement of equity-based compensation	$ 2.4	$ 9.2	$ 11.5
Common Stock
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in Shares)				11,020,000	2,120,000	4,500,000
RSUs \| Minimum
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
RSUs \| Maximum
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Performance Shares
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Delek US 2006 Long-Term Incentive Plan
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in Shares)	5,053,392
Delek US Holdings, Inc. 2016 Long-Term Incentive Plan
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in Shares)							4,400,000
Delek US 2006 and 2016 Long-Term Incentive Plan
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 33.7
Unrecognized compensation cost, period for recognition (years)	1 year 7 months 6 days
Delek Logistics 2012 Long-Term Incentive Plan
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Numbers of units to be delivered, pursuant to vested awards	612,207
General and Administrative Expense \| Delek US 2006 and 2016 Long-Term Incentive Plan
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 22.3	$ 25.2	$ 20.9