Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues	$ 2,474.1	$ 2,768.9	$ 2,636.9	$ 2,353.2	$ 2,483.7	$ 2,370.6	$ 1,230.7	$ 1,182.2	$ 10,233.1	$ 7,267.1	$ 4,197.9
Operating income (loss)	182.8	255.2	135.1	38.8	112.5	90.8	(46.5)	29.8	611.9	180.3	(49.2)
Net income (loss) from continuing operations	127.6	185.8	87.5	(17.3)	226.9	118.5	(32.2)	15.3	383.6	328.5	(219.7)
Net income (loss) attributable to Delek	$ 121.6	$ 179.8	$ 79.1	$ (40.4)	$ 211.1	$ 104.4	$ (37.9)	$ 11.2	$ 340.1	$ 288.8	$ (153.7)
Basic (loss) earnings per share from continuing operations (USD per share)	$ 1.50	$ 2.15	$ 0.95	$ (0.29)	$ 2.62	$ 1.30	$ (0.61)	$ 0.18	$ 4.31	$ 4.12	$ (3.88)
Diluted (loss) earnings per share from continuing operations (USD per share)	$ 1.48	$ 2.02	$ 0.90	$ (0.29)	$ 2.58	$ 1.29	$ (0.61)	$ 0.18	$ 4.14	$ 4.08	$ (3.88)
Additional deferred tax expense recorded				$ 5.5
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenue, cost of materials and other, correction		$ 273.7	$ 73.4