Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net revenues	$ 10,233.1	$ 7,267.1	$ 4,197.9
Cost of sales:
Cost of materials and other	8,560.5	6,327.6	3,812.9
Operating expenses (excluding depreciation and amortization presented below)	538.5	375.7	247.0
Depreciation and amortization	161.3	132.1	106.2
Total cost of sales	9,260.3	6,835.4	4,166.1
Insurance proceeds — business interruption	0.0	0.0	(42.4)
Operating expenses related to retail and wholesale business (excluding depreciation and amortization presented below)	106.5	53.3	2.3
General and administrative expenses	247.6	175.9	106.1
Depreciation and amortization	38.1	21.2	10.2
Other operating (income) expense, net	(31.3)	1.0	4.8
Total operating costs and expenses	9,621.2	7,086.8	4,247.1
Operating income (loss)	611.9	180.3	(49.2)
Interest expense	125.9	93.8	54.4
Interest income	(5.8)	(4.0)	(1.5)
(Income) loss from equity method investments	(9.7)	(12.6)	43.4
Loss on impairment of equity method investment	0.0	0.0	245.3
Gain on remeasurement of equity method investment	0.0	(190.1)	0.0
Gain on sale of business	(13.3)	0.0	0.0
Impairment loss on assets held for sale	27.5	0.0	0.0
Loss on extinguishment of debt	9.1	0.0	0.0
Other (income) expense, net	(7.3)	(6.1)	0.4
Total non-operating (income) expenses, net	126.4	(119.0)	342.0
Income (loss) from continuing operations before income tax expense (benefit)	485.5	299.3	(391.2)
Income tax expense (benefit)	101.9	(29.2)	(171.5)
Income (loss) from continuing operations, net of tax	383.6	328.5	(219.7)
Discontinued operations:
(Loss) income from discontinued operations, including gain (loss) on sale of discontinued operations	(10.9)	(8.6)	144.2
Income tax (benefit) expense	(2.2)	(2.7)	57.9
(Loss) income from discontinued operations, net of tax	(8.7)	(5.9)	86.3
Net income (loss)	374.9	322.6	(133.4)
Net income attributed to non-controlling interests	34.8	33.8	20.3
Net income (loss) attributable to Delek	$ 340.1	$ 288.8	$ (153.7)
Basic income (loss) per share:
Income from continuing operations (USD per share)	$ 4.31	$ 4.12	$ (3.88)
Income (loss) from discontinued operations (USD per share)	(0.20)	(0.08)	1.39
Total basic income (loss) per share (USD per share)	4.11	4.04	(2.49)
Diluted income per share:
Income from continuing operations (USD per share)	4.14	4.08	(3.88)
Income (loss) from discontinued operations (USD per share)	(0.19)	(0.08)	1.39
Total diluted income (loss) per share (USD per share)	$ 3.95	$ 4.00	$ (2.49)
Weighted average common shares outstanding:
Basic (in shares)	82,797,110	71,566,225	61,921,787
Diluted (in shares)	86,768,401	72,303,083	61,921,787
Dividends declared per common share outstanding (in usd per share)	$ 0.96	$ 0.60	$ 0.60