Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net income (loss) attributable to Delek	$ 11.2	$ (29.2)
Commodity contracts designated as cash flow hedges:
Unrealized losses, net of ineffectiveness (gains) losses of $(2.2) million and $1.0 million for the three months ended March 31, 2017 and 2016, respectively	(6.0)	(6.8)
Realized losses reclassified to cost of goods sold	7.8	7.3
Gain on cash flow hedges, net	1.8	0.5
Income tax expense	(0.6)	(0.2)
Net comprehensive income on commodity contracts designated as cash flow hedges	1.2	0.3
Foreign currency translation gain (loss)	0.0	0.2
Other comprehensive income (loss) from equity method investments, net of tax (expense) benefit of a nominal amount and $0.1 million for the three months ended March 31, 2017 and 2016, respectively	0.1	(0.2)
Total other comprehensive income	1.3	0.3
Comprehensive income (loss) attributable to Delek	$ 12.5	$ (28.9)