Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income attributable to Delek	$ (31.5)	$ 18.7	$ 48.3	$ (16.1)	$ 37.5	$ 72.5	$ 54.9	$ 33.7	$ 19.4	$ 198.6	$ 117.7
Commodity contracts designated as cash flow hedges:
Unrealized (losses) gains, net of ineffectiveness losses (gains) of $21.5 million, $6.3 million, and $(2.5) million for the years ended December 31, 2015, 2014 and 2013, respectively.									(41.4)	10.3	(6.6)
Realized gains reclassified to cost of goods sold									(0.7)	(22.6)	(0.7)
Loss on cash flow hedges, net									(42.1)	(12.3)	(7.3)
Income tax benefit									14.7	4.0	2.9
Net comprehensive loss on commodity contracts designated as cash flow hedges									(27.4)	(8.3)	(4.4)
Foreign currency translation loss									(0.3)	(0.3)	0.0
Other comprehensive loss from equity method investments, net of tax benefit of $2.7 million for the year ended December 31, 2015									(5.0)
Total other comprehensive loss									(32.7)	(8.6)	(4.4)
Comprehensive (loss) income attributable to Delek									$ (13.3)	$ 190.0	$ 113.3