Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator for EPS - continuing operations
(Loss) income from continuing operations	$ (91.3)	$ (307.0)
Less: Income from continuing operations attributed to non-controlling interest	7.3	7.4
Net loss attributable to Delek	$ (98.6)	$ (314.4)
Denominator:
Weighted Average Number of Shares Outstanding( denominatior for basic EPS) (in shares)	73,803,772	73,437,730
Dilutive effect of stock-based awards	0	0
Weighted average common shares outstanding, assuming dilution (in shares)	73,803,772	73,437,730
EPS:
Basic loss per share (USD per Share)	$ (1.34)	$ (4.28)
Diluted loss per share (USD per share)	$ (1.34)	$ (4.28)
Stock Compensation Plan, Excluding Loss [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	634,006	3,684,935
Stock Compensation Plan, Loss [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	2,733,056	433,488
Share-based Payment Arrangement [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	3,367,062	4,118,423