Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income (loss) attributable to Delek	$ 340.1	$ 288.8	$ (153.7)
Other comprehensive income (loss):
Net comprehensive income (loss) on commodity and interest rate contracts designated as cash flow hedges			23.5
Foreign currency translation (loss) gain (net of taxes)	(0.9)	0.1	0.2
Other comprehensive income from equity method investments, net of tax expense of $0.0 million and $2.2 million for the years ended December 31, 2018 and 2017, respectively	0.0	4.1	0.8
Postretirement benefit plans:
Net actuarial loss	(6.5)	(0.8)	0.0
Curtailment and settlement gains	2.5	6.3	0.0
Recognized due to curtailment and settlement	(2.5)	(6.1)	0.0
Amortization of net actuarial loss	0.5	0.0	0.0
Loss related to postretirement benefit plans, net	(6.0)	(0.6)	0.0
Income tax benefit	1.3	0.0	0.0
Net comprehensive loss on postretirement benefit plans	4.7	0.6	0.0
Total other comprehensive income	20.1	27.8	24.5
Comprehensive income (loss) attributable to Delek	360.2	316.6	(129.2)
Commodity derivatives
Other comprehensive income (loss):
Unrealized gains (losses)	31.4	(2.0)	8.4
Realized losses reclassified	1.7	38.6	27.8
Net gains (losses) related to cash flow hedges	33.1	36.6	36.2
Income tax (expense) benefit	(6.9)	(12.8)	(12.7)
Net comprehensive income (loss) on commodity and interest rate contracts designated as cash flow hedges	26.2	23.8	23.5
Interest Rate Contracts
Other comprehensive income (loss):
Unrealized gains (losses)	(1.3)	0.3	0.0
Realized losses reclassified	0.7	0.3	0.0
Net gains (losses) related to cash flow hedges	(0.6)	0.6	0.0
Income tax (expense) benefit	0.1	(0.2)	0.0
Net comprehensive income (loss) on commodity and interest rate contracts designated as cash flow hedges	$ (0.5)	$ 0.4	$ 0.0