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Equity-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Equity-Based Compensation (Details) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	May 05, 2020	May 04, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares)	143,044		246,463
Delek US 2006 and 2016 Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized equity-based compensation	$ 48.2		$ 48.2
Weighted-average period for amortization of unrecognized compensation cost			2 years 1 month 6 days
Shares issued (in shares)		139,057		383,623
Shares withheld (in shares)	68,944	153,940	130,449	324,076
Delek US 2006 and 2016 Long-Term Incentive Plan \| General and administrative expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	$ 5.0	$ 6.6	$ 10.9	$ 11.4
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized					11,020,000	2,120,000