Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net revenues	$ 1,535.5	$ 2,480.3	$ 3,356.7	$ 4,680.2
Cost of sales:
Cost of materials and other	1,277.8	2,067.7	3,188.4	3,767.1
Operating expenses (excluding depreciation and amortization presented below)	103.4	135.8	232.6	276.7
Depreciation and amortization	53.6	42.6	100.6	81.9
Total cost of sales	1,434.8	2,246.1	3,521.6	4,125.7
Operating expenses related to retail and wholesale business (excluding depreciation and amortization presented below)	24.4	26.5	49.7	52.3
General and administrative expenses	61.7	69.5	127.4	131.7
Depreciation and amortization	6.0	7.5	11.6	15.0
Other operating (income) expense, net	(14.2)	(3.6)	(14.9)	(1.2)
Total operating costs and expenses	1,512.7	2,346.0	3,695.4	4,323.5
Operating income (loss)	22.8	134.3	(338.7)	356.7
Interest expense	29.8	32.8	66.1	61.5
Interest income	(0.5)	(3.3)	(2.2)	(5.8)
Income from equity method investments	(10.7)	(9.3)	(15.8)	(11.9)
Gain on sale of non-operating refinery	(56.9)	0.0	(56.9)	0.0
Other (income) expense, net	(1.5)	4.9	(2.4)	3.5
Total non-operating (income) expense, net	(39.8)	25.1	(11.2)	47.3
Income (loss) before income tax (benefit) expense	62.6	109.2	(327.5)	309.4
Income tax (benefit) expense	(35.9)	24.6	(119.0)	70.4
Income (loss) from continuing operations, net of tax	98.5	84.6	(208.5)	239.0
Discontinued operations:
Loss from discontinued operations, including gain (loss) on sale of discontinued operations	0.0	(1.0)	0.0	(1.0)
Income tax benefit	0.0	(0.2)	0.0	(0.2)
Loss from discontinued operations, net of tax	0.0	(0.8)	0.0	(0.8)
Net income (loss)	98.5	83.8	(208.5)	238.2
Net income attributed to non-controlling interests	10.8	6.5	18.2	11.6
Net income (loss) attributable to Delek	$ 87.7	$ 77.3	$ (226.7)	$ 226.6
Basic income (loss) per share:
Income (loss) from continuing operations (USD per share)	$ 1.19	$ 1.02	$ (3.08)	$ 2.95
Income (loss) from discontinued operations (USD per share)	0	(0.01)	0	(0.01)
Total basic income (loss) per share (USD per Share)	1.19	1.01	(3.08)	2.94
Diluted income (loss) per share:
Income (loss) from continuing operations (USD per share)	1.18	1.01	(3.08)	2.92
Income (loss) from discontinued operations (USD per share)	0	(0.01)	0	(0.01)
Total diluted income (loss) per share (USD per share)	1.18	1.00	(3.08)	2.91
Dividends declared per common share outstanding (in dollars per share)	$ 0.31	$ 0.28	$ 0.62	$ 0.55