Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net sales	$ 1,182.2	$ 886.1
Operating costs and expenses:
Cost of goods sold	1,035.7	815.8
Operating expenses	61.2	69.0
Insurance proceeds — business interruption	0.0	(42.4)
General and administrative expenses	26.5	29.0
Depreciation and amortization	29.0	28.3
Total operating costs and expenses	1,152.4	899.7
Operating income (loss)	29.8	(13.6)
Interest expense	13.6	13.2
Interest income	(1.0)	(0.3)
(Income) loss from equity method investments	(3.1)	18.0
Other expense, net	0.0	0.6
Total non-operating expenses, net	9.5	31.5
Income (loss) from continuing operations before income tax expense (benefit)	20.3	(45.1)
Income tax expense (benefit)	5.0	(23.6)
Income (loss) from continuing operations	15.3	(21.5)
Discontinued operations:
Loss from discontinued operations	0.0	(3.9)
Income tax benefit	0.0	(1.5)
Loss from discontinued operations, net of tax	0.0	(2.4)
Net income (loss)	15.3	(23.9)
Net income attributed to non-controlling interest	4.1	5.3
Net income (loss) attributable to Delek	$ 11.2	$ (29.2)
Basic earnings (loss) per share:
Income (loss) from continuing operations	$ 0.18	$ (0.43)
Loss from discontinued operations	0.00	(0.04)
Total basic earnings (loss) per share	0.18	(0.47)
Diluted earnings (loss) per share:
Income (loss) from continuing operations	0.18	(0.43)
Loss from discontinued operations	0.00	(0.04)
Total diluted earnings (loss) per share	$ 0.18	$ (0.47)
Weighted average common shares outstanding:
Basic	61,978,072	62,132,007
Diluted	62,589,210	62,132,007
Dividends declared per common share outstanding	$ 0.15	$ 0.15