Delek US 10-K26 Feb 152014 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
Document and Entity Information Document (USD $)	Dec. 31, 2014	Feb. 20, 2015	Jun. 30, 2014
Entity Information [Line Items]
Entity Registrant Name	Delek US Holdings, Inc.
Entity Central Index Key	1351541
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Common Stock, Shares, Outstanding		57,274,594
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$1,653,327,694

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$444.10	$400
Accounts receivable	197	250.5
Inventory	469.6	672.3
Other current assets	136.7	94.3
Total current assets	1,247.40	1,417.10
Property, plant and equipment:
Property, plant and equipment	1,958.40	1,678.40
Less: accumulated depreciation	-509.6	-405.2
Property, plant and equipment, net	1,448.80	1,273.20
Goodwill	73.9	73.9
Other intangibles, net	16.2	17.4
Other non-current assets	105.1	58.8
Total assets	2,891.40	2,840.40
Current liabilities:
Accounts payable	477	602
Current portion of long-term debt and capital lease obligations	56.4	33.7
Obligation under Supply and Offtake Agreement	200.9	331
Accrued expenses and other current liabilities	122.9	113.4
Total current liabilities	857.2	1,080.10
Non-current liabilities:
Long-term debt and capital lease obligations, net of current portion	533.3	376.6
Environmental liabilities, net of current portion	8.5	9.2
Asset retirement obligations	9.2	8.5
Deferred tax liabilities	266.3	220
Other non-current liabilities	18.5	25.6
Total non-current liabilities	835.8	639.9
Stockholders' equity:
Preferred stock, $0.01 par value, 10,000,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $0.01 par value, 110,000,000 shares authorized, 60,637,525 shares and 60,229,107 shares issued at December 31, 2014 and 2013, respectively	0.6	0.6
Additional paid-in capital	395.1	384.5
Accumulated other comprehensive loss	-12.6	-4
Treasury stock, 3,365,561 and 1,000,000 shares, at cost, as of December 31, 2014 and 2013, respectively.	-112.6	-37.9
Retained earnings	731.2	591.8
Non-controlling interest in subsidiaries	196.7	185.4
Total stockholders' equity	1,198.40	1,120.40
Total liabilities and stockholders' equity	$2,891.40	$2,840.40

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parentheticals) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Preferred Stock, Par or Stated Value Per Share	$0.01	$0.01
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$0.01	$0.01
Common Stock, Shares Authorized	110,000,000	110,000,000
Common Stock, Shares, Issued	60,637,525	60,229,107
Treasury Stock, Shares	3,365,561	1,000,000

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales	$8,324.30	$8,706.80	$8,726.70
Operating costs and expenses:
Cost of goods sold	7,315.20	7,880.70	7,708.20
Operating expenses	398.8	387.4	363.3
General and administrative expenses	133.4	111.2	99.7
Depreciation and amortization	111.5	89.8	82.5
Other operating income, net	-1.1	0	-0.1
Total operating costs and expenses	7,957.80	8,469.10	8,253.60
Operating income	366.5	237.7	473.1
Interest expense	40.6	37.7	45.7
Interest income	-0.8	-0.3	-0.2
Other income, net	-0.9	-6.3	0
Total non-operating expenses, net	38.9	31.1	45.5
Income before income taxes	327.6	206.6	427.6
Income tax expense	101.6	70.9	151.6
Net income	226	135.7	276
Net income attributed to non-controlling interest	27.4	18	3.2
Net income attributable to Delek	$198.60	$117.70	$272.80
Basic & diluted earnings per share:
Basic	$3.38	$1.99	$4.65
Diluted	$3.35	$1.96	$4.57
Weighted average common shares outstanding:
Basic	58,780,947	59,186,921	58,719,968
Diluted	59,355,120	60,047,138	59,644,798
Dividends declared per common share outstanding	$1	$0.95	$0.60

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income attributable to Delek	$37.50	$72.50	$54.90	$33.70	($4.70)	($1.70)	$46.60	$77.50	$198.60	$117.70	$272.80
Other comprehensive (loss) income:
Net loss on derivative instruments, net of tax benefit of $4.0, $2.9, and $0.7 for years ended December 31, 2014, 2013 and 2012, respectively, and net of ineffectiveness of $6.3, $(2.5) and $(0.8) for the years ended December 31, 2014, 2013 and 2012, respectively.									-8.3	-4.4	-1.4
Foreign currency translation									-0.3	0	0
Comprehensive income									$190	$113.30	$271.40

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parentheticals) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements of Comprehensive Income (Parenthetical) [Abstract]
Income tax benefit on net loss on derivative instruments	$4	$2.90	$0.70
Ineffectiveness gain (loss) on cash flow hedges	$6.30	($2.50)	($0.80)

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2011	$653,600,000	$600,000	$356,900,000	$1,800,000	$294,100,000	$0	$200,000
Beginning balance (shares) at Dec. 31, 2011		58,036,427				0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	276,000,000	0	0	0	272,800,000	0	3,200,000
Unrealized loss on cash flow hedges, net of deferred income tax benefit of $4.0 million, $2.9 million and $0.7 million for the years ended December 31, 2014, 2013 and 2012, respectively, and ineffectiveness of $6.3 million, $(2.5) million and $(0.8) million for the years ended December 31, 2014, 2013 and 2012, respectively.	-1,400,000		0	-1,400,000	0	0	0
Common stock dividends ($1.00, $0.95 and $0.60 per share, for the years ended December 31, 2014, 2013 and 2012, respectively)	-35,500,000	0	0	0	-35,500,000	0	0
Equity-based compensation expense	6,200,000		6,100,000	0	0	0	100,000
Net proceeds from issuance of common units - Delek Logistics	175,500,000		0	0	0		175,500,000
Acquisition of non-controlling interest in subsidiaries	-4,100,000		-3,800,000	0	0	0	-300,000
Income tax benefit of equity-based compensation expense	9,200,000		9,200,000	0	0		0
Taxes paid due to the net settlement of equity-based compensation	-8,200,000		-8,200,000	0	0	0	0
Exercise of equity-based awards	6,700,000	0	6,700,000	0	0	0	0
Exercise of equity-based awards (shares)	2,538,210	1,583,121				0
Foreign currency translation	0
Ending balance at Dec. 31, 2012	1,078,000,000	600,000	366,900,000	400,000	531,400,000	0	178,700,000
Ending balance (shares) at Dec. 31, 2012		59,619,548				0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	135,700,000	0	0	0	117,700,000	0	18,000,000
Unrealized loss on cash flow hedges, net of deferred income tax benefit of $4.0 million, $2.9 million and $0.7 million for the years ended December 31, 2014, 2013 and 2012, respectively, and ineffectiveness of $6.3 million, $(2.5) million and $(0.8) million for the years ended December 31, 2014, 2013 and 2012, respectively.	-4,400,000	0	0	-4,400,000	0	0	0
Common stock dividends ($1.00, $0.95 and $0.60 per share, for the years ended December 31, 2014, 2013 and 2012, respectively)	-57,300,000	0	0	0	-57,300,000	0	0
Equity-based compensation expense	15,000,000		13,100,000	0	0	0	1,900,000
Income tax benefit of equity-based compensation expense	5,900,000		5,900,000	0	0	0	0
Taxes paid due to the net settlement of equity-based compensation	-2,500,000		-2,500,000	0	0	0	0
Exercise of equity-based awards	1,100,000	0	1,100,000	0	0	0	0
Distribution to non-controlling interest	-13,200,000		0	0	0		-13,200,000
Purchase of common stock (shares)						1,000,000
Purchase of common stock	-37,900,000		0	0	0	-37,900,000	0
Exercise of equity-based awards (shares)	773,186	609,559				0
Foreign currency translation	0
Ending balance at Dec. 31, 2013	1,120,400,000	600,000	384,500,000	-4,000,000	591,800,000	-37,900,000	185,400,000
Ending balance (shares) at Dec. 31, 2013		60,229,107				-1,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	226,000,000		0	0	198,600,000		27,400,000
Unrealized loss on cash flow hedges, net of deferred income tax benefit of $4.0 million, $2.9 million and $0.7 million for the years ended December 31, 2014, 2013 and 2012, respectively, and ineffectiveness of $6.3 million, $(2.5) million and $(0.8) million for the years ended December 31, 2014, 2013 and 2012, respectively.	-8,300,000	0	0	-8,300,000	0	0	0
Common stock dividends ($1.00, $0.95 and $0.60 per share, for the years ended December 31, 2014, 2013 and 2012, respectively)	-59,200,000	0	0	0	-59,200,000	0	0
Equity-based compensation expense	13,900,000		12,900,000	0	0	0	1,000,000
Income tax benefit of equity-based compensation expense	1,800,000		1,800,000
Taxes paid due to the net settlement of equity-based compensation	-5,200,000		-5,200,000	0	0	0	0
Exercise of equity-based awards	1,100,000	0	1,100,000	0	0	0	0
Income tax expense from equity-based compensation expense	1,800,000			0	0	0	0
Distribution to non-controlling interest	-17,100,000		0	0	0	0	-17,100,000
Purchase of common stock (shares)						-2,365,561
Purchase of common stock	-74,700,000		0	0	0	-74,700,000	0
Exercise of equity-based awards (shares)	390,753	408,418				0
Foreign currency translation	-300,000		0	-300,000	0	0	0
Ending balance at Dec. 31, 2014	$1,198,400,000	$600,000	$395,100,000	($12,600,000)	$731,200,000	($112,600,000)	$196,700,000
Ending balance (shares) at Dec. 31, 2014		60,637,525				-3,365,561

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income tax benefit on unrealized loss on cash flow hedges	$4	$2.90	$0.70
Ineffectiveness gain (loss) on cash flow hedges	$6.30	($2.50)	($0.80)
Common stock dividends per share	$1	$0.95	$0.60

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$226	$135.70	$276
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	111.5	89.8	82.5
Amortization of deferred financing costs	4.6	6.5	4.7
Accretion of asset retirement obligations	0.6	0.6	0.8
Amortization of unfavorable contract liability	-2.7	-2.6	-0.7
Deferred income taxes	38.8	44.8	25.2
(Gain) loss on disposal of assets	-1.1	1.6	-0.1
Equity-based compensation expense	13.9	15	6.2
Income tax benefit of equity-based compensation	-1.8	-5.9	-9.2
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	55.4	5.8	20.5
Inventories and other current assets	217	-252.6	43.5
Market value of derivatives	-59.9	-8.8	1.1
Accounts payable and other current liabilities	-117.3	50.3	39.3
Obligation under Supply and Offtake Agreement,	-130.1	45.8	-13.4
Non-current assets and liabilities, net	-38	-23.5	-13.5
Net cash provided by operating activities	316.9	102.5	462.9
Cash flows from investing activities:
Business combinations	-33.8	-23.2	-23.3
Purchase of non-controlling interest in subsidiaries	0	0	-4.1
Purchases of property, plant and equipment	-256.9	-222.3	-132
Proceeds from sales of assets	1.3	1.3	0.2
Net cash used in investing activities	-289.4	-244.2	-159.2
Cash flows from financing activities:
Proceeds from long-term revolvers	1,097.70	735.2	713.6
Payments on long-term revolvers	-995.2	-663.9	-650.3
Proceeds from term debt	107.4	70.9	9.3
Payments on term debt and capital lease obligations	-30.2	-94.1	-76.5
Payments of notes payable to related party	0	0	-66.5
Proceeds from exercise of stock options	1.1	1.1	6.7
Proceeds from issuance of common units - Delek Logistics	0	0	175.5
Taxes paid due to the net settlement of equity-based compensation	-5.2	-2.5	-8.2
Income tax benefit of equity-based compensation	1.8	5.9	9.2
Repurchase of common stock	-74.7	-37.9	0
Distribution to non-controlling interest	-17.1	-13.2	0
Dividends paid	-59.2	-57.3	-35.5
Deferred financing costs paid	-9.8	-4.2	-5.2
Net cash provided by (used in) financing activities	16.6	-60	72.1
Net increase (decrease) in cash and cash equivalents	44.1	-201.7	375.8
Cash and cash equivalents at the beginning of the period	400	601.7	225.9
Cash and cash equivalents at the end of the period	444.1	400	601.7
Cash paid during the period for:
Interest, net of capitalized interest of $1.5 million, $1.0 million and $0.3 million in the 2014, 2013 and 2012, respectively.	37.1	31.3	40.7
Income taxes	$111.70	$73.70	$111.30

Consolidated_Statements_of_Cas1

Consolidated Statements of Cash Flows (Parentheticals) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements of Cash Flows (Parenthetical) [Abstract]
Capitalized interest	$1.50	$1	$0.30

General_Notes

General (Notes)	12 Months Ended
General (Notes)	Dec. 31, 2014
General [Abstract]
Business Description and Basis of Presentation [Text Block]	General
Business Description and Basis of Presentation [Text Block]	Delek US Holdings, Inc. is the sole shareholder or owner of membership interests of Delek Refining, Inc. ("Refining"), Delek Finance, Inc., Delek Marketing & Supply, LLC, Lion Oil Company ("Lion Oil"), Delek Renewables, LLC, Delek Rail Logistics, Inc., Delek Logistics Services Company, MAPCO Express, Inc. ("MAPCO Express"), MAPCO Fleet, Inc., NTI Investments, LLC, GDK Bearpaw, LLC, Delek Helena, LLC, Commerce Way Insurance Company, Inc., Delek Land Holdings, LLC and Delek Transportation, LLC. Unless otherwise indicated or the context requires otherwise, the terms "we," "our," "us," "Delek" and the "Company" are used in this report to refer to Delek US Holdings, Inc. and its consolidated subsidiaries. Delek is listed on the New York Stock Exchange under the symbol "DK."

Accounting_Policies_Notes

Accounting Policies (Notes)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies [Text Block]	Accounting Policies

	Basis of Presentation
	Our consolidated financial statements include the accounts of Delek and its subsidiaries. All significant intercompany transactions and account balances have been eliminated in consolidation. We have evaluated subsequent events through the filing of this Form 10-K. Any material subsequent events that occurred during this time have been properly recognized or disclosed in our financial statements.
	Our consolidated financial statements include Delek Logistics Partners, LP ("Delek Logistics"), a variable interest entity. As the general partner of Delek Logistics, we have the sole ability to direct the activities of Delek Logistics that most significantly impact its economic performance. We are also considered to be the primary beneficiary for accounting purposes and are Delek Logistics' primary customer. As Delek Logistics does not derive a significant amount of gross margin from third parties, there is limited risk to Delek associated with Delek Logistics' operations. However, in the event that Delek Logistics incurs a loss, our operating results will reflect Delek Logistics' loss, net of intercompany eliminations, to the extent of our ownership interest in Delek Logistics.
	The preparation of financial statements in conformity with U.S. generally accepted accounting principles ("GAAP") and in accordance with the rules and regulations of the Securities and Exchange Commission ("SEC") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

	Reclassifications
	Certain prior period amounts have been reclassified in order to conform to the current year presentation. For example, our December 31, 2013 balance sheet has been adjusted to increase goodwill by $1.2 million, offset by a corresponding decrease to property, plant and equipment, due to the finalization of the purchase price allocation of our Hopewell Pipeline (as defined in Note 4 below). These reclassifications had no effect on net income or shareholders' equity as previously reported.

	Segment Reporting
	Delek is a diversified energy business focused on petroleum refining, wholesale sales of refined products and retail marketing. Management views operating results in primarily three segments: refining, logistics and retail. As of December 31, 2014, the refining segment operated high conversion, independent refineries in Tyler, Texas (the "Tyler refinery") and El Dorado, Arkansas (the "El Dorado refinery") and biodiesel facilities in Cleburne, Texas and Crossett, Arkansas. The logistics segment owns and operates crude oil and refined products logistics and marketing assets. The retail segment markets gasoline, diesel and other refined petroleum products, and convenience merchandise through a network of 365 company-operated retail fuel and convenience stores. Segment reporting is more fully discussed in Note 12.

	Cash and Cash Equivalents
	Delek maintains cash and cash equivalents in accounts with large, multi-national financial institutions and retains nominal amounts of cash at the convenience store locations as petty cash. All highly liquid investments purchased with a term of three months or less are considered to be cash equivalents. As of December 31, 2014 and 2013, these cash equivalents consisted primarily of bank certificates of deposit and bank money market accounts, as well as overnight investments in U.S. Government obligations and bank repurchase obligations collateralized by U.S. Government obligations.

	Accounts Receivable
	Accounts receivable primarily consists of receivables related to credit card sales, receivables from vendor promotions and trade receivables generated in the ordinary course of business. Delek recorded an allowance for doubtful accounts related to trade receivables of a nominal amount as of both December 31, 2014 and 2013, respectively.
	No customer accounted for more than 10% of our consolidated accounts receivable balance as of December 31, 2014 or 2013. No customers accounted for more than 10% of consolidated net sales for the years ended December 31, 2014, 2013 or 2012.

	Inventory
	Refinery inventory consists of crude oil, refined products and blendstocks which are stated at the lower of cost or market. Inventory cost at the Tyler refinery is determined under the last-in, first-out ("LIFO") valuation method. Cost of crude oil, refined product and blendstock inventories in excess of market value are charged to cost of goods sold. Such changes are subject to reversal in subsequent periods, not to exceed LIFO cost, if prices recover. Inventory costs at the El Dorado refinery are stated at the lower of cost or market on a first-in, first-out ("FIFO") basis.
	Logistics inventory consists of refined products which are stated at the lower of cost or market on a FIFO basis.
	Retail merchandise inventory consists of gasoline, diesel fuel, other petroleum products, cigarettes, beer, convenience merchandise and food service merchandise. Fuel inventories are stated at the lower of cost or market on a FIFO basis. Non-fuel inventories are stated at estimated cost as determined by the retail inventory method.
	One vendor in the refining segment and a second vendor used by both the refining and retail segments accounted for a total of 32.9%, 25.0% and 24.2% of our consolidated inventory purchases during the years ended December 31, 2014, 2013 and 2012, respectively.

	Property, Plant and Equipment
	Assets acquired by Delek in conjunction with acquisitions are recorded at estimated fair market value in accordance with the purchase method of accounting as prescribed in Accounting Standards Codification ("ASC") 805, Business Combinations ("ASC 805"). Other acquisitions of property and equipment are carried at cost. Betterments, renewals and extraordinary repairs that extend the life of an asset are capitalized. Maintenance and repairs are charged to expense as incurred. Delek owns certain fixed assets on leased locations and depreciates these assets and asset improvements over the lesser of management's estimated useful lives of the assets or the remaining lease term.

	Depreciation is computed using the straight-line method over management's estimated useful lives of the related assets, which are as follows:



		Years
	Automobiles	5-Mar
	Computer equipment and software	10-Mar
	Refinery turnaround costs	5-Apr
	Furniture and fixtures	15-May
	Asset retirement obligation assets	15-50
	Refinery machinery and equipment	May-40
	Pipelines and terminals	15-40
	Retail store equipment and site improvements	30-Jul
	Building and building improvements	15-40

	Other Intangible Assets
	Delek has intangible assets consisting of long-term supply contracts, non-compete agreements, trademarks, capacity contracts and rights of way. We amortize the definite-lived intangible assets on straight-line bases over the estimated useful lives of three to 11.5 years. The amortization expense is included in depreciation and amortization on the accompanying consolidated statements of income.

	Property, Plant and Equipment and Other Intangibles Impairment
	Property, plant and equipment and definite life intangibles are evaluated for impairment whenever indicators of impairment exist. In accordance with ASC 360 and ASC 350, Intangibles - Goodwill and Other, Delek evaluates the realizability of these long-lived assets as events occur that might indicate potential impairment. In doing so, Delek assesses whether the carrying amount of the asset is unrecoverable by estimating the sum of the future cash flows expected to result from the asset, undiscounted and without interest charges. If the carrying amount is more than the recoverable amount, an impairment charge must be recognized based on the fair value of the asset.
	Property and equipment of retail stores identified for closing are written down to their estimated net realizable value at the time such stores are closed. Delek analyzes regional market, division and store operations for changes in market demographics, competition, economic conditions and other factors, including the variability of cash flow. As a result, we identified and recorded impairment charges of $0.1 million, $0.6 million and $0.9 million for closed stores in 2014, 2013 and 2012, respectively. Similar changes may occur in the future that will require us to record an impairment charge.

	Capitalized Interest
	Delek capitalizes interest on capital projects associated with the refining segment and with the construction related to the new "prototype" stores being built in the retail segment. For the years ended December 31, 2014, 2013 and 2012, interest of $1.5 million, $1.0 million and $0.3 million, respectively, was capitalized relating to these projects.

	Refinery Turnaround Costs
	Refinery turnaround costs are incurred in connection with planned shutdowns and inspections of the Tyler and El Dorado refineries' major units to perform necessary repairs and replacements. Refinery turnaround costs are deferred when incurred, classified as property, plant and equipment and amortized on a straight-line basis over that period of time estimated to lapse until the next planned turnaround occurs. Refinery turnaround costs include, among other things, the cost to repair, restore, refurbish or replace refinery equipment such as vessels, tanks, reactors, piping, rotating equipment, instrumentation, electrical equipment, heat exchangers and fired heaters.

	Goodwill and Potential Impairment
	Goodwill in an acquisition represents the excess of the aggregate purchase price over the fair value of the identifiable net assets. Delek's goodwill, all of which was acquired in various purchase business combinations, is recorded at original fair value and is not amortized. Goodwill is subject to annual assessment to determine if an impairment of value has occurred and Delek performs this review annually in the fourth quarter. We could also be required to evaluate our goodwill if, prior to our annual assessment, we experience disruptions in our business, have unexpected significant declines in operating results, or sustain a permanent market capitalization decline. If a reporting unit's carrying amount exceeds its fair value, the impairment assessment leads to the testing of the implied fair value of the reporting unit's goodwill to its carrying amount. If the implied fair value is less than the carrying amount, a goodwill impairment charge is recorded. Our annual assessment of goodwill did not result in impairment during the years ended December 31, 2014, 2013 or 2012.

	Derivatives
	Delek records all derivative financial instruments, including interest rate swap and cap agreements, fuel-related derivatives, over the counter ("OTC") future swaps and forward contracts at estimated fair value in accordance with the provisions of ASC 815, Derivatives and Hedging ("ASC 815"). Changes in the fair value of the derivative instruments are recognized in operations, unless we elect to apply the hedging treatment permitted under the provisions of ASC 815 allowing such changes to be classified as other comprehensive income. We validate the fair value of all derivative financial instruments on a periodic basis, utilizing valuations from third party financial and brokerage institutions. On a regular basis, Delek enters into commodity contracts with counterparties for crude oil, blendstocks, and various finished products. These contracts usually qualify for the normal purchase / normal sale exemption under the standard and, as such, are not measured at fair value.
	Delek's policy under the guidance of ASC 815-10-45, Derivatives and Hedging - Other Presentation Matters ("ASC 815-10-45"), is to net the fair value amounts recognized for multiple derivative instruments executed with the same counterparty and offset these values against the cash collateral arising from these derivative positions.

Fair Value of Financial Instruments
The fair values of financial instruments are estimated based upon current market conditions and quoted market prices for the same or similar instruments. Management estimates that the carrying value approximates fair value for all of Delek's assets and liabilities that fall under the scope of ASC 825, Financial Instruments ("ASC 825").
Delek applies the provisions of ASC 820, Fair Value Measurements and Disclosure ("ASC 820") in its presentation and disclosures regarding fair value, which pertain to certain financial assets and liabilities measured at fair value in the balance sheet on a recurring basis. ASC 820 defines fair value, establishes a framework for measuring fair value and expands disclosures about such measurements that are permitted or required under other accounting pronouncements. See Note 13 for further discussion.
Delek also applies the provisions of ASC 825 as it pertains to the fair value option. This standard permits the election to carry financial instruments and certain other items similar to financial instruments at fair value on the balance sheet, with all changes in fair value reported in earnings. By electing the fair value option in conjunction with a derivative, an entity can achieve an accounting result similar to a fair value hedge without having to comply with complex hedge accounting rules. As of December 31, 2014 or 2013, we did not make the fair value election for any financial instruments not already carried at fair value in accordance with other standards.

Self-Insurance Reserves
Delek is primarily self-insured for workers' compensation and general liability costs, with varying limits of per claim and aggregate stop loss insurance coverage that management considers adequate. We maintain an accrual for these costs based on claims filed and an estimate of claims incurred but not reported. Differences between actual settlements and recorded accruals are recorded in the period identified.

Vendor Discounts and Deferred Revenue
Delek receives cash discounts or cash payments from certain vendors related to product promotions based upon factors such as quantities purchased, quantities sold, merchandise exclusivity, store space and various other factors. In accordance with ASC 605-50, Revenue Recognition - Customer Payments and Incentives, we recognize these amounts as a reduction of inventory until the products are sold, at which time the amounts are reflected as a reduction in cost of goods sold. Certain of these amounts are received from vendors related to agreements covering several periods. These amounts are initially recorded as deferred revenue, are reclassified as a reduction in inventory over the period the products are received, and are subsequently recognized as a reduction of cost of goods sold as the products are sold.
Delek also receives advance payments from certain vendors relating to non-inventory agreements. These amounts are recorded as deferred revenue and are subsequently recognized as a reduction of cost of goods sold as earned.

Environmental Expenditures
It is Delek's policy to accrue environmental and clean-up related costs of a non-capital nature when it is both probable that a liability has been incurred and the amount can be reasonably estimated. Environmental liabilities represent the current estimated costs to investigate and remediate contamination at our properties. This estimate is based on internal and third-party assessments of the extent of the contamination, the selected remediation technology and review of applicable environmental regulations, typically considering estimated activities and costs for the next 15 years, unless a specific longer range estimate is practicable. Accruals for estimated costs from environmental remediation obligations generally are recognized no later than completion of the remedial feasibility study and include, but are not limited to, costs to perform remedial actions and costs of machinery and equipment that are dedicated to the remedial actions and that does not have an alternative use. Such accruals are adjusted as further information develops or circumstances change. We discount environmental liabilities to their present value if payments are fixed and determinable. Expenditures for equipment necessary for environmental issues relating to ongoing operations are capitalized.

Asset Retirement Obligations
Delek recognizes liabilities which represent the fair value of a legal obligation to perform asset retirement activities, including those that are conditional on a future event, when the amount can be reasonably estimated. In the retail segment, these obligations relate to the net present value of estimated costs to remove underground storage tanks at owned and leased retail sites which are legally required under the applicable leases. The asset retirement obligation for storage tank removal on leased retail sites is being accreted over the expected life of the owned retail site or the average retail site lease term. In the refining segment, these obligations relate to the required disposal of waste in certain storage tanks, asbestos abatement at an identified location and other estimated costs that would be legally required upon final closure of the Tyler and El Dorado refineries. In the logistics segment, these obligations related to the required cleanout of the pipeline and terminal tanks, and removal of certain above-grade portions of the pipeline situated on right-of-way property.
The reconciliation of the beginning and ending carrying amounts of asset retirement obligations is as follows (in millions):



		December 31,
		2014				2013
Beginning balance		$	8.5			$	8.3

Liabilities identified		0.2				0.2

Liabilities settled		(0.1		)		(0.6		)
Accretion expense		0.6				0.6

Ending balance		$	9.2			$	8.5

In order to determine fair value, management must make certain estimates and assumptions including, among other things, projected cash flows, a credit-adjusted risk-free rate and an assessment of market conditions that could significantly impact the estimated fair value of the asset retirement obligations.

Revenue Recognition
Revenues for products sold are recorded at the point of sale upon delivery of product, which is the point at which title to the product is transferred, and when payment has either been received or collection is reasonably assured.
Delek derives service revenue from the sale of lottery tickets, money orders, car washes and other ancillary product and service offerings. Service revenue and related costs are recorded at gross amounts and net amounts, as appropriate, in accordance with the provisions of ASC 605-45, Revenue Recognition - Principal Agent Considerations ("ASC 605-45"). We record service revenue and related costs at gross amounts when Delek is the primary obligor, is subject to inventory risk, has latitude in establishing prices and selecting suppliers, influences product or service specifications, or has several but not all of these indicators. When Delek is not the primary obligor and does not possess other indicators of gross reporting as discussed previously, we record net service revenue.

Cost of Goods Sold and Operating Expenses
For the retail segment, cost of goods sold comprises the costs of specific products sold. Operating expenses include costs such as wages of employees at the stores, lease expense for the stores, utility expense for the stores and other costs of operating the stores. For the refining segment, cost of goods sold includes all the costs of crude oil, feedstocks and external costs. Operating expenses include the costs associated with the actual operations of the Tyler and El Dorado refineries and biodiesel facilities. For the logistics segment, cost of goods sold includes all costs of refined products, additives and related transportation. Operating expenses include the costs associated with the actual operation of owned terminals, terminalling expense at third-party locations and pipeline maintenance costs.

Sales, Use and Excise Taxes
Delek's policy is to exclude sales, use and excise taxes from revenue when we are an agent of the taxing authority, in accordance with ASC 605-45.

Deferred Financing Costs
Deferred financing costs are included in other non-current assets in the accompanying consolidated balance sheets and represent expenses related to issuing our long-term debt and obtaining our lines of credit. These amounts are amortized ratably over the remaining term of the respective financing and are included in interest expense. See Note 10 for further information.

Advertising Costs
Delek expenses advertising costs as the advertising space is utilized. Advertising expense for the years ended December 31, 2014, 2013 and 2012 was $3.6 million, $4.0 million and $3.4 million, respectively.

Operating Leases
Delek leases land, buildings and various equipment under various operating lease arrangements, most of which provide the option, after the initial lease term, to renew the leases. Some of these lease arrangements include fixed rental rate increases, while others include rental rate increases based upon such factors as changes, if any, in defined inflationary indices.
In accordance with ASC 840-20, Leases - Operating Leases, for all leases that include fixed rental rate increases, Delek calculates the total rent expense for the entire lease period, considering renewals for all periods for which failure to renew the lease imposes economic penalty, and records rental expense on a straight-line basis in the accompanying consolidated statements of income.

Income Taxes
Income taxes are accounted for under the provisions of ASC 740, Income Taxes ("ASC 740"). This statement generally requires Delek to record deferred income taxes for the differences between the book and tax bases of its assets and liabilities, which are measured using enacted tax rates and laws that will be in effect when the differences are expected to reverse. Deferred income tax expense or benefit represents the net change during the year in our deferred income tax assets and liabilities, exclusive of the amounts held in other comprehensive income.
ASC 740 also prescribes a comprehensive model for how companies should recognize, measure, present and disclose in their financial statements uncertain tax positions taken or expected to be taken on a tax return and prescribes the minimum recognition threshold a tax position is required to meet before being recognized in the financial statements. Finally, ASC 740 requires an annual tabular roll-forward of unrecognized tax benefits.

Earnings Per Share
Basic and diluted earnings per share are computed by dividing net income by the weighted average common shares outstanding. The common shares used to compute Delek’s basic and diluted earnings per share are as follows:


		Year Ended December 31,
		2014			2013			2012
Weighted average common shares outstanding		58,780,947			59,186,921			58,719,968

Dilutive effect of equity instruments		574,173			860,217			924,830

Weighted average common shares outstanding, assuming dilution		59,355,120			60,047,138			59,644,798

Outstanding equity awards totaling 1,867,368, 1,226,038 and 1,344,825 common share equivalents were excluded from the diluted earnings per share calculation for the years ended December 31, 2014, 2013 and 2012, respectively. These share equivalents did not have a dilutive effect under the treasury stock method.

Stock-Based Compensation
ASC 718, Compensation - Stock Compensation ("ASC 718"), requires the cost of all share-based payments to employees, including grants of employee stock options, to be recognized in the income statement and establishes fair value as the measurement objective in accounting for share-based payment arrangements. ASC 718 requires the use of a valuation model to calculate the fair value of stock-based awards on the date of grant. Delek uses the Black-Scholes-Merton option-pricing model to determine the fair value of stock option and stock appreciation right (SAR) awards, with the exception of the SARs granted to certain executive employees, which are valued under the Monte-Carlo simulation model.
Restricted stock units ("RSUs") are measured based on the fair market value of the underlying stock on the date of grant. Vested RSUs are not issued until the minimum statutory withholding requirements have been remitted to us for payment to the taxing authority. As a result, the actual number of shares accounted for as issued may be less than the number of RSUs vested, due to any withholding amounts which have not been remitted.
We generally recognize compensation expense related to stock-based awards with graded or cliff vesting on a straight-line basis over the vesting period. It is our practice to issue new shares when stock-based compensation is exercised.

Comprehensive Income
For the years ended December 31, 2014, 2013 and 2012, comprehensive income includes net income and changes in the fair value of derivative instruments designated as cash flow hedges and foreign currency translation adjustments.

New Accounting Pronouncements
In May 2014, the FASB issued guidance regarding “Revenue from Contracts with Customers,” to clarify the principles for recognizing revenue. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also requires improved interim and annual disclosures that enable the users of financial statements to better understand the nature, amount, timing, and uncertainty of revenues and cash flows arising from contracts with customers. The new guidance is effective for annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period, and can be adopted either retrospectively to each prior reporting period presented using a practical expedient as allowed by the new guidance or retrospectively with a cumulative effect adjustment to retained earnings as of the date of initial application. Early adoption is not permitted. We are currently evaluating the effect that adopting this new standard will have on our consolidated financial statements and related disclosures.
On January 1, 2014 we adopted guidance issued by the Financial Accounting Standards Board ("FASB") regarding "Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists." This guidance requires that companies net their unrecognized tax benefits against all same-jurisdiction net operating losses or tax credit carryforwards that would be used to settle the position with a tax authority. The adoption of this guidance did not materially affect our business, financial position or results of operations.

Delek_Logistics_Notes

Delek Logistics (Notes)	12 Months Ended
	Dec. 31, 2014
Variable Interest Entity [Abstract]
Delek Logistics Partners, LP	Delek Logistics
	Delek Logistics is a publicly traded limited partnership that was formed by Delek to own, operate, acquire and construct crude oil and refined products logistics and marketing assets. A substantial majority of Delek Logistics' assets are currently integral to Delek’s refining and marketing operations. As of December 31, 2014, we owned a 59.9% limited partner interest in Delek Logistics, and a 95.8% interest in Logistics GP, which owns both the entire 2.0% general partner interest in Delek Logistics and all of the incentive distribution rights. Delek's partnership interest in Delek Logistics includes 2,799,258 common units, 11,999,258 subordinated units and 494,197 general partner units.
	In July 2013, Delek Logistics completed the acquisition of a terminal, storage tanks and related assets adjacent to our refinery in Tyler, Texas (the "Tyler refinery") from one of our subsidiaries (the "Tyler Acquisition"). The cash paid for the assets acquired was approximately $94.8 million, financed with a combination of proceeds from the amended and restated Delek Logistics revolving credit agreement and cash on hand.

	In February 2014, a subsidiary of Delek Logistics completed the acquisition of certain storage tanks and the products terminal located at our refinery in El Dorado, Arkansas (the "El Dorado refinery") from Lion Oil (the "El Dorado Acquisition"). The cash paid for the assets acquired was approximately $95.9 million, financed with borrowings under the amended and restated Delek Logistics revolving credit agreement. The storage tanks have approximately 2.5 million barrels of aggregate shell capacity and consist of 158 tanks and ancillary assets, including piping and pumps.

	The Tyler Acquisition and the El Dorado Acquisition are each considered a transfer of a business between entities under common control. As such, the assets acquired and liabilities assumed were transferred to Delek Logistics at historical basis instead of fair value.
	We have agreements with Delek Logistics that, among other things, establish fees for certain administrative and operational services provided by us and our subsidiaries to Delek Logistics, provide certain indemnification obligations and establish terms for fee-based commercial logistics and marketing services provided by Delek Logistics and its subsidiaries to us.
	Delek Logistics is a variable interest entity as defined under GAAP and is consolidated into our consolidated financial statements. With the exception of affiliate balances which are eliminated in consolidation, the Delek Logistics condensed consolidated balance sheets as of December 31, 2014 and 2013, as presented below, are included in the consolidated balance sheets of Delek.


		December 31,
		2014		2013
		(In millions)
	ASSETS
	Cash and cash equivalents	$	1.9	$	0.9

	Accounts receivable	28		29

	Inventory	10.3		17.5

	Other current assets	0.8		0.3

	Net property, plant and equipment	240.5		224.5

	Goodwill	11.7		11.7

	Intangible assets, net	11.3		12.4

	Other non-current assets	7.4		5

	Total assets	$	311.9	$	301.3

	LIABILITIES AND EQUITY
	Accounts payable	$	18.2	$	26

	Accounts payable to related parties	0.6		1.5

	Accrued expenses and other current liabilities	11.8		12.2

	Revolving credit facility	251.8		164.8

	Asset retirement obligations	3.3		3.1

	Deferred tax liabilities	0.2		0.3

	Other non-current liabilities	5.9		6.2

	Equity	20.1		87.2

	Total liabilities and equity	$	311.9	$	301.3

Acquisitions_Notes

Acquisitions (Notes)	12 Months Ended
	Dec. 31, 2014
Acquisitions [Abstract]
Acquisitions	Acquisitions

	Trucking Asset Acquisition

	On December 17, 2014, Delek Logistics purchased 100% of the assets of Frank Thompson Transport, Inc. ("FTT"). FTT is a transport company that primarily hauls crude oil and refined products by transport truck. The assets purchased include approximately 120 trucks and 200 trailers (the "FTT Assets"). The aggregate purchase price of the FTT Assets was approximately $11.6 million, of which $0.5 million has been allocated to working capital and $11.1 million has been preliminarily allocated to property, plant and equipment, which is subject to change during the purchase price allocation period.
	Mount Pleasant Acquisition
	On October 1, 2014, Delek Logistics purchased (i) a light products terminal in Mount Pleasant, Texas (the "Mount Pleasant Terminal"), (ii) a light products storage facility in Greenville, Texas (the "Greenville Storage Facility") and (iii) a 76-mile pipeline connecting the locations (the "Greenville-Mount Pleasant Pipeline"). The Mount Pleasant Terminal, the Greenville Storage Facility and the Greenville-Mount Pleasant Pipeline are hereinafter collectively referred to as the "Greenville-Mount Pleasant Assets." Delek Logistics acquired the Greenville-Mount Pleasant Assets from an affiliate of Magellan Midstream Partners, L.P. to complement our existing assets and provide enhanced logistical capabilities. The Mount Pleasant Terminal consists of approximately 200,000 barrels of light product storage capacity, three truck loading lanes and ethanol blending capability. The Greenville Storage Facility has approximately 325,000 barrels of storage capacity and is connected to the Explorer Pipeline System. The aggregate purchase price was approximately $11.1 million in cash, of which $1.1 million and $10.0 million has been allocated to inventory and property, plant and equipment, respectively. The property, plant and equipment valuation is subject to change during the purchase price allocation period.
	Crossett Biodiesel Facility Acquisition

	On January 2, 2014, we purchased a biodiesel plant in Crossett, Arkansas (the "Crossett Facility") from Pinnacle Biofuels, Inc. for approximately $11.1 million, of which $11.0 million and $0.1 million has been allocated to property, plant and equipment and inventory, respectively. The Crossett Facility has a production capacity of approximately 10.0 million gallons per year and produced biodiesel exclusively for Delek under a tolling agreement prior to this acquisition.
	Helena Acquisition

	On December 31, 2013, we purchased a 149-mile pipeline and terminal from an affiliate of Enterprise Product Partners L.P. for $5.0 million. The pipeline is a 10-inch diameter pipe that connects El Dorado, Arkansas to Helena, Arkansas (the "Helena Pipeline"). The terminal is located on the Mississippi River in Helena, Arkansas, contains a dock, and can be used for crude oil or finished products (the "Helena Terminal" and together with the Helena Pipeline, the "Helena Assets"). The Helena Assets are currently out of service and will require capital investment to be restored to working order. This purchase gives us rights of way that terminates in El Dorado, Arkansas, and offers flexibility to increase crude access and light product outlets for the El Dorado refinery.
	The allocation of the aggregate purchase price of the Helena Assets as of December 31, 2014 is summarized as follows (in millions):



	Property, plant and equipment	$	1

	Intangible assets	4

		$	5

	North Little Rock Acquisition
	On October 24, 2013, we purchased a refined product terminal in Little Rock, Arkansas from Enterprise Refined Products Pipeline Company LLC. The aggregate purchase price was approximately $7.2 million, including $2.2 million in refined product inventory. The remainder of the purchase price was allocated to property, plant and equipment.
	Hopewell Acquisition
	On July 19, 2013, we purchased a 13.5-mile pipeline from Enterprise TE Products Pipeline Company LLC (the "Hopewell Pipeline"). The Hopewell Pipeline originates at the Tyler refinery and terminates at the Hopewell delivery yard, where it connects to our pipeline that terminates at the Big Sandy Terminal (as defined below). The Hopewell Pipeline and the Big Sandy Pipeline (as defined below) form essentially one pipeline link between the Tyler Refinery and the Big Sandy Terminal (collectively, the Hopewell Pipeline and the Big Sandy Pipeline are referred to as the "Tyler-Big Sandy Pipeline"). The aggregate purchase price was approximately $5.7 million.
	The allocation of the aggregate purchase price of the Hopewell Pipeline as of December 31, 2014 is summarized as follows (in millions):


	Property, plant and equipment	$	3.5

	Goodwill (all is expected to be deductible for tax purposes)	1.2

	Intangible assets	1

		$	5.7

	Beacon Acquisition
	On January 10, 2013, we purchased a biodiesel plant in Cleburne, Texas, involved in the production of biodiesel fuels and related activities, from Beacon Energy (Texas) Corp. The aggregate purchase price was approximately $5.3 million, which has been allocated to property, plant and equipment.

Inventory_Notes

Inventory (Notes)	12 Months Ended
	Dec. 31, 2014
Inventory, Net [Abstract]
Inventory	Inventory
	Refinery inventory consists of crude oil, refined products and blendstocks which are stated at the lower of cost or market. Cost of inventory for the Tyler refinery is determined under the LIFO valuation method. Cost of inventory for the El Dorado refinery is determined on a FIFO basis. Cost of crude oil, refined product and feedstock inventories in excess of market value are charged to cost of goods sold.
	Logistics inventory consists of refined products which are stated at the lower of cost or market on a FIFO basis.
	Retail merchandise inventory consists of gasoline, diesel fuel, other petroleum products, cigarettes, beer, convenience merchandise and food service merchandise. Fuel inventories are stated at the lower of cost or market on a FIFO basis. Non-fuel inventories are stated at estimated cost as determined by the retail inventory method.
	Carrying value of inventories consisted of the following (in millions):


		December 31,		December 31,
		2014		2013
	Refinery raw materials and supplies	$	158.8	$	250.9

	Refinery work in process	26.5		58.6

	Refinery finished goods	235.1		299.2

	Retail fuel	10.9		19.2

	Retail merchandise	28		26.9

	Logistics refined products	10.3		17.5

	Total inventories	$	469.6	$	672.3


	In the year ended December 31, 2014, market prices declined to a level below the average cost of our inventories and we recorded a $50.1 million pre-tax write down of the carrying value of our inventory to the market value. Of the total write down, $35.4 million related to LIFO inventory, which is subject to reversal in subsequent periods, not to exceed LIFO cost, should market prices recover.
	At December 31, 2014 and December 31, 2013, the excess of replacement cost (FIFO) over the carrying value (LIFO) of the Tyler refinery inventories was $0.3 million and $51.5 million, respectively. There were increases of $6.4 million, $0.3 million and $1.1 million to costs of goods sold during the years ended December 31, 2014, 2013 and 2012, respectively, as a result of the liquidation of LIFO inventories.

Crude_Oil_Supply_and_Inventory

Crude Oil Supply and Inventory Purchase Agreement (Notes)	12 Months Ended
Crude Oil Supply and Inventory Purchase Agreement (Notes)	Dec. 31, 2014
Crude Oil Supply and Inventory Purchase Agreement [Abstract]
Crude Oil Supply and Inventory Purchase Agreement	Crude Oil Supply and Inventory Purchase Agreement
	Delek has a Master Supply and Offtake Agreement (the "Supply and Offtake Agreement") with J. Aron & Company ("J. Aron"). Throughout the term of the Supply and Offtake Agreement, which was amended on December 23, 2013 to expire on April 30, 2017, Lion Oil and J. Aron will identify mutually acceptable contracts for the purchase of crude oil from third parties and J. Aron will supply up to 100,000 bpd of crude to the El Dorado refinery. J. Aron purchases virtually all crude oil and refined products at monthly average prices as Lion Oil needs the materials for refining processes or sale to third parties. These daily purchases and sales are made using provisional prices and are trued-up on a monthly basis in order to reflect actual average monthly prices. We have recorded a (payable) receivable related to this monthly settlement of $(4.9) million and $18.2 million as of December 31, 2014 and 2013, respectively. Also pursuant to the Supply and Offtake Agreement and other related agreements, Lion Oil will endeavor to arrange potential sales by either Lion Oil or J. Aron to third parties of the products produced at the El Dorado refinery or purchased from third parties. In instances where Lion Oil is the seller to such third parties, J. Aron will first transfer the applicable products to Lion Oil.
	While title to the inventories will reside with J. Aron, this arrangement will be accounted for as a product financing arrangement. Delek incurred fees payable to J. Aron of $10.5 million and $10.0 million during the year ended December 31, 2014 and 2013, respectively. These amounts are included as a component of interest expense in the condensed consolidated statements of income. Upon any termination of the Supply and Offtake Agreement, including in connection with a force majeure event, the parties are required to negotiate with third parties for the assignment to us of certain contracts, commitments and arrangements, including procurement contracts, commitments for the sale of product, and pipeline, terminalling, storage and shipping arrangements.
	Upon the expiration of the Supply and Offtake Agreement on April 30, 2017 or upon any earlier termination, Delek will be required to repurchase the consigned crude oil and refined products from J. Aron at then prevailing market prices. At December 31, 2014, Delek had 3.2 million barrels of inventory consigned for J. Aron and we have recorded liabilities associated with this consigned inventory of $200.9 million in the condensed consolidated balance sheet.

Property_Plant_and_Equipment_N

Property, Plant and Equipment (Notes)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure [Text Block]	Property, Plant and Equipment
	Property, plant and equipment, at cost, consist of the following (in millions):



			December 31,
			2014			2013
	Land		$	94.9		$	86.1

	Building and building improvements		266			255

	Refinery machinery and equipment		771.4			641.4

	Pipelines and terminals		266.2			204.6

	Retail store equipment and site improvements		187.4			158.3

	Refinery turnaround costs		112			55.1

	Other equipment		77.8			58.4

	Construction in progress		182.7			219.5

			1,958.40			1,678.40

	Less: accumulated depreciation		(509.6		)	(405.2		)
			$	1,448.80		$	1,273.20

	Property, plant and equipment, accumulated depreciation and depreciation expense by reporting segment as of and for the years ended December 31, 2014 and 2013 are as follows (in millions):


			As of and For the Year Ended December 31, 2014
			Refining(1)			Logistics(1)			Retail			Corporate,			Consolidated
												Other and Eliminations
	Property, plant and equipment		$	1,098.10		$	293.5		$	511.9		$	54.9		$	1,958.40

	Less: Accumulated depreciation		(252.9		)	(53.0		)	(194.5		)	(9.2		)	(509.6		)
	Property, plant and equipment, net		$	845.2		$	240.5		$	317.4		$	45.7		$	1,448.80

	Depreciation expense		$	63.5		$	13.6		$	28.5		$	4.6		$	110.2





			As of and For the Year Ended December 31, 2013
			Refining(1)			Logistics(1)			Retail			Corporate,			Consolidated
												Other and Eliminations
	Property, plant and equipment		$	893.3		$	264.1		$	477.6		$	43.4		$	1,678.40

	Less: Accumulated depreciation		(192.7		)	(39.6		)	(168.4		)	(4.5		)	(405.2		)
	Property, plant and equipment, net		$	700.6		$	224.5		$	309.2		$	38.9		$	1,273.20

	Depreciation expense		$	44.3		$	12.6		$	25.2		$	3.4		$	85.5


	(1)	In conjunction with the El Dorado Acquisition, we have reclassified certain operating segments. The certain assets previously operated by our refining segment were contributed to Delek Logistics.

Goodwill_Notes

Goodwill (Notes)	12 Months Ended
	Dec. 31, 2014
Goodwill [Abstract]
Goodwill Disclosure [Text Block]	Goodwill

	Goodwill represents the excess of the aggregate purchase price over the fair value of the identifiable net assets acquired. Goodwill acquired in a purchase business combination is recorded at fair value and is not amortized. Delek's goodwill relates to its retail and logistics segments only. As of December 31, 2014, our accumulated goodwill impairment losses were $20.4 million, all of which related to our retail segment.

	Delek performs an annual assessment of whether goodwill retains its value. This assessment is done more frequently if indicators of potential impairment exist. We performed our annual goodwill impairment review in the fourth quarter of 2014, 2013 and 2012. In our retail segment, this review was performed on reporting units at a level below our reportable segment level. In our logistics segment, our review was done at the original west Texas operations level of the segment. We performed a discounted cash flows test to test for value of each of our reporting units. We use a market participant weighted average cost of capital, estimated minimal growth rates for revenue, gross profit, and capital expenditures based on history and our best estimate of future forecasts. We also estimated the fair values of the reporting units using a multiple of expected future cash flows such as those used by third party analysts. In December 31, 2014, 2013 and 2012, the annual impairment review resulted in the determination that no impairment of goodwill had occurred.

	A summary of our goodwill accounts in our retail and logistics segments are as follows (in millions):



			Retail		Logistics		Total
	Balance,	December 31, 2011	$	62.2	$	7.5	$	69.7

	Acquisitions		—		3		3

	Balance,	December 31, 2012	62.2		10.5		72.7

	Acquisitions		—		1.2		1.2

	Balance,	December 31, 2013	62.2		11.7		73.9

	Balance,	December 31, 2014	$	62.2	$	11.7	$	73.9

Other_Intangible_Assets_Notes

Other Intangible Assets (Notes)	12 Months Ended
	Dec. 31, 2014
Other Intangible Assets Disclosure [Abstract]
Intangible Assets Disclosure [Text Block]	Other Intangible Assets

	A summary of our identifiable intangible assets are as follows (in millions):


	As of December 31, 2014	Useful Life	Gross		Accumulated Amortization			Net
	Intangible Assets subject to amortization:
	Supply contracts	11.5 years	$	12.2	$	(8.9	)	$	3.3

	Trademarks	4 years	0.7		(0.7		)	—

	Non-compete Agreements	3-10 years	1.3		(1.3		)	—

	Capacity contract	8 years	9.3		(8.5		)	0.8

	Intangible assets not subject to amortization:

	Rights-of-Way	Indefinite	12.1		—			12.1

	Total		$	35.6	$	(19.4	)	$	16.2





	As of December 31, 2013	Useful Life	Gross		Accumulated Amortization			Net
	Intangible Assets subject to amortization:
	Supply contracts	11.5 years	$	12.2	$	(7.9	)	$	4.3

	Trademarks	4 years	0.7		(0.7		)	—

	Non-compete Agreements	3-10 years	1.3		(1.3		)	—

	Capacity contract	8 years	9.3		(8.2		)	1.1

	Intangible assets not subject to amortization:
	Rights-of-Way	Indefinite	12		—			12

	Total		$	35.5	$	(18.1	)	$	17.4


	Amortization of intangible assets was $1.3 million, $4.3 million and $4.2 million during the years ended December 31, 2014, 2013 and 2012, respectively, and is included in depreciation and amortization on the accompanying consolidated statements of income. Amortization expense is estimated to be $1.3 million, $1.3 million, $1.3 million and $0.2 million, for the years ended 2015 through 2018, respectively.

LongTerm_Obligations_and_Notes

Long-Term Obligations and Notes Payable (Notes)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Long-Term Obligations and Notes Payable
	Outstanding borrowings under Delek’s existing debt instruments and capital lease obligations are as follows (in millions):


		December 31,		December 31,
		2014		2013
	MAPCO Revolver	$	76	$	67.5

	Wells Term Loan	64.2		—

	DKL Revolver	251.8		164.8

	Reliant Bank Revolver	17		10

	Promissory Notes	76		77.4

	Lion Term Loan Facility, net of $0.3 million debt discount	104.2		90

	Capital Lease Obligations	0.5		0.6

		589.7		410.3

	Less: Current portion of long-term debt, notes payable and capital lease obligations	56.4		33.7

		$	533.3	$	376.6

	Principal maturities of Delek's existing third party debt instruments for the next five years and thereafter are as follows as of December 31, 2014 (in millions):


		2015		2016		2017		2018		2019		Thereafter		Total
	MAPCO Revolver	$	—	$	—	$	—	$	—	$	76	$	—	$	76

	Wells Term Loan	23.3		40.9		—		—		—		—		64.2

	DKL Revolver	—		—		—		—		251.8		—		251.8

	Reliant Bank Revolver	—		17		—		—		—		—		17

	Promissory Notes	11		11		11.1		1.1		1.2		40.6		76

	Lion Term Loan Facility, net of $0.3 million debt discount	21.9		21.9		21.9		38.5		—		—		104.2

	Capital Lease Obligations	0.1		0.1		0.1		0.1		0.1		—		0.5

	Total	$	56.3	$	90.9	$	33.1	$	39.7	$	329.1	$	40.6	$	589.7

	MAPCO Revolver

	Our subsidiary, MAPCO Express, has a revolving credit facility with Fifth Third Bank, as administrative agent, and a syndicate of lenders that was amended and restated on May 6, 2014 (the "MAPCO Revolver"). The MAPCO Revolver consists of a $160.0 million revolving credit limit which includes (i) a $10.0 million swing line loan sub-limit; (ii) a $40.0 million letter of credit sub-limit; and (iii) an accordion feature which permits an increase in borrowings by up to $50.0 million, subject to additional lender commitments. As of December 31, 2014, we had $76.0 million outstanding under the MAPCO Revolver, as well as letters of credit issued of $2.6 million, with approximately $81.4 million availability remaining. Borrowings under the MAPCO Revolver are secured by (i) substantially all the assets of MAPCO Express and its subsidiaries, subject to certain exceptions and limitations, (ii) all of Delek’s shares in MAPCO Express, and (iii) a limited guaranty provided by Delek of up to $50.0 million in obligations. The MAPCO Revolver will mature on May 6, 2019. The MAPCO Revolver bears interest based on predetermined pricing grids which allow us to choose between base rate loans or London Interbank Offered Rate ("LIBOR") loans. At December 31, 2014, the weighted average borrowing rate under the MAPCO Revolver was approximately 3.6%. Additionally, the MAPCO Revolver requires us to pay a leverage ratio dependent quarterly fee on the average unused revolving commitment. As of December 31, 2014, this fee was 0.35% per year.
	Wells ABL

	Our subsidiary, Delek Refining, Ltd., has an asset-based loan credit facility with Wells Fargo Bank, National Association, as administrative agent, and a syndicate of lenders (the "Wells ABL") that consists of (i) a $600.0 million revolving loan (the "Wells Revolving Loan"), which includes a $55.0 million swing line loan sub-limit and a $550.0 million letter of credit sub-limit, (ii) a $70.0 million delayed single draw term loan (the "Wells Term Loan"), and (iii) an accordion feature which permits an increase in the size of the revolving credit facility to an aggregate of $875.0 million subject to additional lender commitments and the satisfaction of certain other conditions precedent. The Wells Revolving Loan matures on January 16, 2019 and the Wells Term Loan matures on December 31, 2016. The Wells Term Loan is subject to repayment in level principal installments of approximately $5.8 million per quarter, beginning December 31, 2014, with a final balloon payment due on December 31, 2016. As of December 31, 2014, under the Wells ABL we had letters of credit issued totaling $90.5 million and no amounts outstanding under the Wells Revolving Loan; under the Wells Term Loan we had approximately $64.2 million outstanding. Borrowings under the Wells ABL are secured by substantially all the assets of Refining and its subsidiaries, with certain limitations. Under the facility, revolving loans and letters of credit are provided subject to availability requirements which are determined pursuant to a borrowing base calculation as defined in the credit agreement. The borrowing base as calculated is primarily supported by cash, certain accounts receivable and certain inventory. Borrowings under the Wells Revolving Loan and Wells Term Loan bear interest based on separate predetermined pricing grids which allow us to choose between base rate loans or LIBOR loans. At December 31, 2014, the weighted average borrowing rate under the Wells Term Loan was approximately 3.9%. Additionally, the Wells ABL requires us to pay a quarterly unused credit commitment fee. As of December 31, 2014, this fee was approximately 0.38% per year. Borrowing capacity, as calculated and reported under the terms of the Wells ABL credit facility, as of December 31, 2014, was $186.3 million.
	DKL Revolver

	Delek Logistics has a $700.0 million Senior Secured Revolving Credit Agreement with Fifth Third Bank, as administrative agent, and a syndicate of lenders (the "DKL Revolver"). Delek Logistics and each of its existing subsidiaries are borrowers under the DKL Revolver. The DKL Revolver contains a dual currency borrowing tranche that permits draw downs in U.S. or Canadian dollars and an accordion feature whereby Delek Logistics can increase the size of the credit facility to an aggregate of $800.0 million, subject to receiving increased or new commitments from lenders and the satisfaction of certain other conditions precedent.

	The obligations under the DKL Revolver are secured by a first priority lien on substantially all of Delek Logistics' tangible and intangible assets. Additionally, a subsidiary of Delek provides a limited guaranty of Delek Logistics' obligations under the DKL Revolver. The guaranty is (i) limited to an amount equal to the principal amount, plus unpaid and accrued interest, of a promissory note made by Delek in favor of the subsidiary guarantor (the "Holdings Note") and (ii) secured by the subsidiary guarantor's pledge of the Holdings Note to the DKL Revolver lenders. As of December 31, 2014, the principal amount of the Holdings Note was $102.0 million.
	The DKL Revolver will mature on December 30, 2019. Borrowings under the DKL Revolver bear interest at either a U.S. base rate, Canadian prime rate, LIBOR, or a Canadian Dealer Offered Rate ("CDOR"), plus applicable margins, at the election of the borrowers and as a function of draw down currency. The applicable margin, in each case, varies based upon Delek Logistics' Leverage Ratio, which is defined as the ratio of total funded debt to EBITDA for the most recently ended four fiscal quarters. At December 31, 2014, the weighted average borrowing rate was approximately 2.3%. Additionally, the DKL Revolver requires us to pay a leverage ratio dependent quarterly fee on the average unused revolving commitment. As of December 31, 2014, this fee was 0.3% per year. As of December 31, 2014, Delek Logistics had $251.8 million of outstanding borrowings under the credit facility, as well as letters of credit issued of $7.5 million. Amounts available under the DKL Revolver, as of December 31, 2014, were approximately $440.8 million.
	Reliant Bank Revolver

	We have a revolving credit agreement with Reliant Bank which was amended on June 26, 2014 (the "Reliant Bank Revolver"). The Reliant Bank Revolver provides for unsecured loans of up to $17.0 million. As of December 31, 2014, we had $17.0 million outstanding under this facility. The Reliant Bank Revolver matures on June 28, 2016 and bears interest at a fixed rate of 5.25% per annum. The Reliant Bank Revolver requires us to pay a quarterly fee of 0.50% per year on the average available revolving commitment. As of December 31, 2014, we had no undrawn amounts available under the Reliant Bank Revolver.
	Promissory Notes
	In 2011, Delek began construction on new MAPCO Mart convenience stores (each a "Build-to-Suit Development" or "BTS"). In order to fund these construction projects, we entered into separate notes for each BTS project with Standard Insurance Company (collectively, the "Notes") varying in size from $1.0 million to $2.2 million. The Notes bear interest at fixed rates, ranging from 5.0% to 6.4% per annum. Each of the Notes is secured by the land or leasehold interest, as applicable, and the building and equipment of its respective completed MAPCO Mart. Under the terms of each Note, beginning on the first day of the eleventh month following the initial fund advancement, payments of principal on each respective Note are due over a ten-year term calculated using a 25-year amortization schedule. If any Note is not paid in full after the initial ten-year period, we may continue to make monthly payments under the Note, however, the interest rate will reset pursuant to the terms of the Note. There is also an additional interest rate reset after the first 20-year period. The final maturity dates of the Notes range from June 1, 2036 to November 1, 2039. As of December 31, 2014, we had amounts drawn under 29 Notes related to these BTS projects for a total amount of approximately $46.0 million outstanding under the Notes.
	On April 29, 2011, Delek entered into a $50.0 million promissory note (the "Ergon Note") with Ergon, Inc. in connection with the closing of our acquisition of Lion Oil. As of December 31, 2014, $30.0 million was outstanding under the Ergon Note. The Ergon Note requires Delek to make annual amortization payments of $10.0 million each, commencing April 29, 2013. The Ergon Note matures on April 29, 2017. Interest under the Ergon Note is computed at a fixed rate equal to 4.0% per annum.
On December 19, 2011, Delek entered into a $25.0 million promissory note (the "Ergon Paline Note") with Ergon Terminaling, Inc. ("Ergon Terminaling") in connection with the closing of the acquisition of all of the membership interests of Paline from Ergon Terminaling. The Ergon Paline Note was subsequently assigned by Ergon Terminaling to Ergon. The Ergon Paline Note matured on December 19, 2014 and as of December 31, 2014, there were no amounts outstanding under the Ergon Paline Note.
Lion Term Loan

Our subsidiary, Lion Oil, has a term loan credit facility (the "Lion Term Loan") with Israel Discount Bank of New York, Bank Hapoalim B.M. and Fifth Third Bank as the lenders. The Lion Term Loan was amended on June 23, 2014 to add Fifth Third Bank as an additional lender in the principal amount to $20.0 million, thereby increasing the total loan size to $110.0 million. As of December 31, 2014, $104.5 million was outstanding under the Lion Term Loan. The Lion Term Loan requires Lion Oil to make quarterly principal amortization payments in the amount of $5.5 million each, commencing on December 31, 2014. The Lion Term Loan matures on December 18, 2018, and is secured by (i) all the assets of Lion Oil (excluding inventory and accounts receivable), (ii) all of our shares in Lion Oil, and (iii) a first priority lien on the subordinated and common units of Delek Logistics held by Lion Oil. Interest on the unpaid balance of the Lion Term Loan is computed at a rate per annum equal to LIBOR or the base rate, at our election, plus the applicable margins, subject in each case to an interest rate floor of 5.50% per annum. As of December 31, 2014, the weighted average borrowing rate under the Lion Term Loan was 5.5%.
Restrictive Covenants
Under the terms of our MAPCO Revolver, Wells ABL, DKL Revolver, Reliant Bank Revolver and Lion Term Loan, we are required to comply with certain usual and customary financial and non-financial covenants. Further, although we were not required to comply with a fixed charge coverage ratio financial covenant under the Wells ABL during the year ended December 31, 2014, we may be required to comply with this covenant at times when the borrowing base excess availability is less than certain thresholds, as defined in the Wells ABL. We believe we were in compliance with all covenant requirements under each of our credit facilities as of December 31, 2014.
Certain of our credit facilities contain limitations on the incurrence of additional indebtedness, making of investments, creation of liens, dispositions of property, making of restricted payments and transactions with affiliates. Specifically, these covenants may limit the payment, in the form of cash or other assets, of dividends or other distributions, or the repurchase of shares with respect to the equity of our subsidiaries. Additionally, certain of our credit facilities limit our ability to make investments, including extensions of loans or advances to, or acquisitions of equity interests in, or guarantees of obligations of, any other entities.
Restricted Net Assets
Some of Delek's subsidiaries have restrictions in their respective credit facilities limiting their use of certain assets, as has been discussed above. The total amount of our subsidiaries' restricted net assets as of December 31, 2014 was $941.8 million.
Interest-Rate Derivative Instruments
Delek entered into interest rate swap and cap agreements for a total notional amount of $205.0 million. These agreements are intended to economically hedge floating interest rate risk related to our existing debt. However, as we have elected to not apply the permitted hedge accounting treatment, including formal hedge designation and documentation, in accordance with the provisions of ASC 815, the fair value of the derivatives is recorded in other current assets in the accompanying consolidated balance sheets with the offset recognized in interest expense in the accompanying consolidated statements of income. The derivative instruments mature in 2015 and 2016. The estimated mark-to-market liability associated with our interest rate derivatives as of December 31, 2014 and 2013 was $0.9 million and $2.7 million, respectively.
In accordance with ASC 815, we recorded expense representing cash settlements and changes in estimated fair value of the interest rate derivative agreements of $0.4 million, $0.4 million and $2.6 million for the years ended December 31, 2014, 2013 and 2012, respectively. These amounts are included in interest expense in the accompanying consolidated statements of income.
While Delek has not elected to apply permitted hedge accounting treatment for these interest rate derivatives in accordance with the provisions of ASC 815 in the past, we may choose to apply that treatment for future transactions.

Equity_Based_Compensation_Note

Equity Based Compensation (Notes)	12 Months Ended
	Dec. 31, 2014
Equity Based Compensation [Abstract]
Equity Based Compensation	Equity Based Compensation

	2006 Long-Term Incentive Plan
	The Delek US Holdings, Inc. 2006 Long-Term Incentive Plan, as amended (the "Plan"), allows Delek to grant stock options, SARs, restricted stock, RSUs, performance awards and other stock-based awards of up to 5,053,392 shares of Delek's common stock to certain directors, officers, employees, consultants and other individuals who perform services for Delek or its affiliates. Stock options and SARs granted under the Plan are generally granted at market price or higher. The vesting of all outstanding awards is subject to continued service to Delek or its affiliates except that vesting of awards granted to certain executive employees could, under certain circumstances, accelerate upon termination of their employment and the vesting of all outstanding awards could accelerate upon the occurrence of an Exchange Transaction (as defined in the Plan).

	In the second quarter of 2010, Delek's Board of Directors and its Incentive Plan Committee began using stock-settled SARs, rather than stock options, as the primary form of appreciation award under the Plan.

	Delek Logistics GP, LLC 2012 Long-Term Incentive Plan

	Logistics GP maintains a unit-based compensation plan for officers, directors and employees of Logistics GP or its affiliates and any consultants, affiliates of our general partner or other individuals who perform services for Delek Logistics. The Delek Logistics GP, LLC 2012 Long-Term Incentive Plan ("Logistics LTIP") permits the grant of phantom units, unit options, restricted units, unit appreciation rights, distribution equivalent rights, unit awards, and other unit-based awards. The Logistics LTIP limits the number of units that may be delivered pursuant to vested awards to 612,207 common units, subject to proportionate adjustment in the event of unit splits and similar events. Awards granted under the Logistics LTIP will be settled with Delek Logistics units. Total compensation expense for awards granted under the Logistics LTIP amounted to $1.6 million ($1.0 million, net of taxes) and $4.2 million ($2.7 million, net of taxes) for the years ended December 31, 2014 and 2013, respectively. These amounts are included in general and administrative expenses in the accompanying consolidated statements of income.

	As of December 31, 2014, there was $4.4 million of total unrecognized compensation cost related to non-vested Logistics LTIP awards, which is expected to be recognized over a weighted-average period of 2.7 years.

	Option and SAR Assumptions

	The table below provides the assumptions used in estimating the fair values of our outstanding stock options and SARs under the Plan. For all awards granted, we calculated volatility using historical volatility and implied volatility of a peer group of public companies using weekly stock prices.


			2014 Grants				2013 Grants				2012 Grants			2011 Grants			2010 Grants
			(Graded Vesting)				(Graded Vesting)				(Graded Vesting)			(Graded Vesting)			(Graded Vesting)
			4 years				4 years				4 years			4 years			4 years
	Expected Volatility		50.15%-52.63%				53.36%-53.95%				55.35%-57.46%			58.58%-60.54%			33.01-60.88%

	Dividend Yield		2.54%-2.74%				1		%		1		%	1		%	1		%

	Expected Term		4.54-6.25 years				6.25 years				6.25 years			6.25 years			6.25 years

	Risk Free Rate		0.01%-2.96%				0.01%-2.96%				0.04%-2.04%			0.00%-3.37%			0.06%-3.33%

	Fair Value		$	10.67			$	15.75			$	9.28		$	6.59		$	3.51


	Stock Option and SAR Activity

	The following table summarizes the stock option and SAR activity under the Plan for Delek for the years ended December 31, 2014, 2013 and 2012:



			Number of Options			Weighted-Average Exercise Price				Weighted-Average Contractual Term		Average Intrinsic Value
	Options outstanding, December 31, 2011		4,057,829			$	11.71

	Granted		1,140,300			$	19.01

	Exercised		(2,538,210	)		$	10.95

	Forfeited		(101,078	)		$	12.84

	Options and SARs outstanding, December 31, 2012		2,558,841			$	15.67

	Granted		867,400			$	33.23

	Exercised		(773,186	)		$	14.07

	Forfeited		(265,125	)		$	20.41

	Options and SARs outstanding, December 31, 2013		2,387,930			$	22.04

	Granted		1,006,100			$	30.18

	Exercised		(390,753	)		$	14.27

	Forfeited		(306,691	)		$	27.02

	Options and SARs outstanding, December 31, 2014		2,696,586			$	25.61			8.2		$	16.1

Vested options and SARs exercisable, December 31, 2014		721,450			$	14.17			6.3		$	9.4


Restricted Stock Units

The Plan also provides for the award of RSUs to certain employees and non-employee directors. RSUs granted to employees vest ratably over three to five years from the date of grant and RSUs granted to non-employee directors vest quarterly over the year following the date of grant. The fair value of RSUs is determined based on the closing price of Delek's common stock on grant date.

During 2014, we granted 49,836 performance-based RSUs to Ezra Uzi Yemin, our Chairman, President and Chief Executive Officer (our "CEO") which may vest in 2015 and 2016, based on the level of performance during the performance period and subject to continued employment. The number of awards that will ultimately vest is based on the Company's total shareholder return over the performance period ended December 31, 2015 and 2016 relative to the total shareholder return of a peer group of companies during the same period. The weighted average grant date fair value of $36.84 was determined using a Monte-Carlo simulation model, which assumed a risk-free rate of interest of 0.72%, an expected life of 2.56 years and an expected volatility of 40.26%. As these awards include a market condition, we record compensation expense for these awards based on the grant date fair value of the award, recognized ratably over the measurement period.

The following table summarizes the RSU activity under the Plan for Delek for the years ended December 31, 2014, 2013 and 2012:



		Number of RSUs			Weighted-Average Grant Price
Non-vested RSUs,	December 31, 2011	935,500			$	11.41

Granted		156,000			$	23.94

Vested		(279,045	)		$	11.65

Non-vested RSUs,	December 31, 2012	812,455			$	13.73

Granted		121,000			$	32.59

Vested		(284,786	)		$	15.02

Forfeited		(136,000	)		$	10.91

Non-vested RSUs,	December 31, 2013	512,669			$	18.21

Granted		145,452			$	32.41

Vested		(241,122	)		$	18.17

Non-vested RSUs,	December 31, 2014	416,999			$	23.19

Compensation Expense Related to Equity-based Awards Granted Under the Plan
Total compensation expense for the equity-based awards amounted to $11.9 million ($7.7 million, net of taxes), $9.3 million ($6.0 million, net of taxes) and $6.1 million ($4.0 million, net of taxes) for the years ended December 31, 2014, 2013 and 2012, respectively. These amounts are included in general and administrative expenses in the accompanying consolidated statements of income. We recognized a total income tax benefit for equity-based awards of $1.8 million, $5.9 million and $9.2 million for the years end December 31, 2014, 2013 and 2012, respectively.
As of December 31, 2014, there was $25.5 million of total unrecognized compensation cost related to non-vested share-based compensation arrangements, which is expected to be recognized over a weighted-average period of 2.3 years.
The aggregate intrinsic value, which represents the difference between the underlying stock's market price and the award's exercise price, of the share-based awards exercised or vested during the years ended December 31, 2014, 2013 and 2012 was $13.9 million, $10.9 million and $27.8 million, respectively. During the years December 31, 2014, 2013 and 2012, respectively, we issued 408,418, 609,743 and 1,583,121 shares of common stock as a result of exercised or vested equity-based awards. These amounts are net of 223,457, 448,229 and 1,234,134 shares, respectively, withheld to satisfy employee tax obligations related to the exercises and vestings for the years ended December 31, 2014, 2013 and 2012. Delek paid approximately $5.2 million, $2.5 million and $8.2 million of taxes in connection with the settlement of these awards for the years ended December 31, 2014, 2013 and 2012. We issue new shares of common stock upon exercise or vesting of share-based awards.
Granting of GP Interest
On March 10, 2013, we granted membership interests in Logistics GP, the general partner of Delek Logistics, to certain executives, including our CEO. These interests consisted of a total 1.4% membership interest in Logistics GP and vested on June 10, 2013. On December 10, 2013, we granted Mr. Yemin an additional 4.0% membership interest in Logistics GP, half of which vested immediately. Subject to Mr. Yemin's continued employment with Delek, 0.50% vested on June 10, 2014 and 0.25% will vest every six months thereafter through June 10, 2017. Total compensation expense recognized for these grants amounted to $0.4 million ($0.3 million, net of taxes) and $1.5 million ($1.0 million, net of taxes) for the years ended December 31, 2014 and 2013. As of December 31, 2014, there was $0.5 million of total unrecognized compensation cost related to non-vested GP membership interests, which is expected to be recognized over a weighted-average period of 2.4 years.

Segment_Data_Notes

Segment Data (Notes)	12 Months Ended
	Dec. 31, 2014
Segment Data [Abstract]
Segment Data	Segment Data
	We report our operating results in three reportable segments: refining, logistics and retail. Decisions concerning the allocation of resources and assessment of operating performance are made based on this segmentation. Management measures the operating performance of each of its reportable segments based on the segment contribution margin.
	In conjunction with the El Dorado Acquisition, we reclassified the components of certain operating segments. The results of the operations of the assets associated with these acquisitions were previously reported as part of our refining segment and are now reported in our logistics segment. The historical results of the operations of these assets have been reclassified to conform to the current presentation.
	In April 2014, we revised the structure of the internal financial information reviewed by management and began allocating the results of hedging activity previously reported in corporate, other and eliminations to our refining segment. The historical results of this hedging activity have been reclassified to conform to the current presentation. The assets and/or liabilities associated with this hedging activity have not been allocated to the refining segment.
	Segment contribution margin is defined as net sales less cost of sales and operating expenses, excluding depreciation and amortization. Operations which are not specifically included in the reportable segments are included in the corporate and other category, which primarily consists of operating expenses, depreciation and amortization expense and interest income and expense associated with corporate headquarters.
	The refining segment processes crude oil and other purchased feedstocks for the manufacture of transportation motor fuels including various grades of gasoline, diesel fuel, aviation fuel, asphalt and other petroleum-based products that are distributed through owned and third-party product terminals. The refining segment has a combined nameplate capacity of 140,000 bpd, including the 60,000 bpd Tyler refinery and the 80,000 bpd El Dorado refinery. As of December 31, 2014, the refining segment also owned and operated two biodiesel facilities involved in the production of biodiesel fuels and related activities and a currently idle pipeline and terminal in Helena, Arkansas.
	Our logistics segment owns and operates crude oil and refined products logistics and marketing assets. The logistics segment generates revenue and subsequently contribution margin, which we define as net sales less cost of goods sold and operating expenses, by charging fees for gathering, transporting and storing crude oil and for marketing, distributing, transporting and storing intermediate and refined products.
	Our retail segment markets gasoline, diesel, other refined petroleum products and convenience merchandise through a network of company-operated retail fuel and convenience stores throughout the southeastern United States. As of December 31, 2014, we had 365 stores in total, consisting of 197 located in Tennessee, 90 in Alabama, 48 in Georgia, 13 in Arkansas and 8 in Virginia. The remaining 9 stores are located in Kentucky and Mississippi. The retail fuel and convenience stores operate under Delek’s MAPCO Express®, MAPCO Mart®, East Coast®, Fast Food and FuelTM, Favorite Markets®, Delta Express® and Discount Food MartTM brands. The retail segment also supplied fuel to approximately 46 dealer locations as of December 31, 2014. In the retail segment, management reviews operating results on a divisional basis, where a division represents a specific geographic market. These divisional operating segments exhibit similar economic characteristics, provide the same products and services, and operate in such a manner such that aggregation of these operations is appropriate for segment presentation.
	Our refining segment has a services agreement with our logistics segment, which, among other things, requires the refining segment to pay service fees based on the number of gallons sold at the Tyler refinery and a sharing of a portion of the margin achieved in return for providing marketing, sales and customer services. This intercompany transaction fee was $14.4 million and $13.6 million during the years ended December 31, 2014 and 2013, respectively. Additionally, the refining segment pays crude transportation and storage fees to the logistics segment for the utilization of certain crude pipeline assets. These fees were $94.6 million and $57.8 million during the years ended December 31, 2014 and 2013, respectively. During the year ended December 31, 2014 and 2013, the refining segment recorded sales and fee revenues from the retail and logistics segments in the amount of $622.1 million and $430.7 million, respectively. All inter-segment transactions have been eliminated in consolidation.
	The following is a summary of business segment operating performance as measured by contribution margin for the period indicated (in millions):


			As of and For the Year Ended December 31, 2014
	(In millions)		Refining			Retail			Logistics			Corporate,				Consolidated
												Other and Eliminations
	Net sales (excluding intercompany fees and sales)		$	5,728.40		$	1,869.30		$	726.7		$	(0.1	)		$	8,324.30

	Intercompany fees and sales		622.1			—			114.6			(736.7		)		—

	Operating costs and expenses:
	Cost of goods sold		5,664.80			1,671.50			697.2			(718.3		)		7,315.20

	Operating expenses		221.7			136.8			38.8			1.5				398.8

	Segment contribution margin		$	464		$	61		$	105.3		$	(20.0	)		610.3

	General and administrative expenses															133.4

	Depreciation and amortization															111.5

	Other operating income															(1.1		)
	Operating income															$	366.5

	Total assets		$	1,959.90		$	447.1		$	311.8		$	172.6			$	2,891.40

	Capital spending (excluding business combinations)		$	201.1		$	26.2		$	7.2		$	22.4			$	256.9




			As of and For the Year Ended December 31, 2013
	(In millions)		Refining			Retail			Logistics			Corporate,				Consolidated
												Other and Eliminations
	Net sales (excluding intercompany fees and sales)		$	6,005.10		$	1,871.40		$	829.8		$	0.5			$	8,706.80

	Intercompany fees and sales		430.7			—			77.6			(508.3		)		—

	Operating costs and expenses:
	Cost of goods sold		5,865.20			1,691.30			811.3			(487.1		)		7,880.70

	Operating expenses		223.1			132.5			35.6			(3.8		)		387.4

	Segment contribution margin		$	347.5		$	47.6		$	60.5		$	(16.9	)		438.7

	General and administrative expenses															111.2

	Depreciation and amortization															89.8

	Operating income															$	237.7

	Total assets		$	1,881.10		$	449		$	301.3		$	209			$	2,840.40

	Capital spending (excluding business combinations)		$	136.7		$	37.9		$	12.7		$	35			$	222.3




		As of and For the Year Ended December 31, 2012
(In millions)		Refining			Retail			Logistics			Corporate,				Consolidated
											Other and Eliminations
Net sales (excluding intercompany fees and sales)		$	6,070.80		$	1,877.80		$	775.9		$	2.2			$	8,726.70

Intercompany fees and sales		170.1			—			42.6			(212.7		)		—

Operating costs and expenses:
Cost of goods sold		5,441.30			1,704.60			757.9			(195.6		)		7,708.20

Operating expenses		197.7			128			39.4			(1.8		)		363.3

Segment contribution margin		$	601.9		$	45.2		$	21.2		$	(13.1	)		655.2

General and administrative expenses															99.7

Depreciation and amortization															82.5

Other operating income, net															(0.1		)
Operating income															$	473.1

Total assets		$	1,811.20		$	425.6		$	307.9		$	79			$	2,623.70

Capital spending (excluding business combinations)		$	46.1		$	29.1		$	30.3		$	26.5			$	132

Fair_Value_Measurements_Notes

Fair Value Measurements (Notes)	12 Months Ended
	Dec. 31, 2014
Fair Value Measurements [Abstract]
Fair Value Measurements	Fair Value Measurements
	The fair values of financial instruments are estimated based upon current market conditions and quoted market prices for the same or similar instruments. Management estimates that the carrying value approximates fair value for all of Delek’s assets and liabilities that fall under the scope of ASC 825.
	Delek applies the provisions of ASC 820, which defines fair value, establishes a framework for its measurement and expands disclosures about fair value measurements. ASC 820 applies to our interest rate and commodity derivatives that are measured at fair value on a recurring basis. The standard also requires that we assess the impact of nonperformance risk on our derivatives. Nonperformance risk is not considered material at this time.
	ASC 820 requires disclosures that categorize assets and liabilities measured at fair value into one of three different levels depending on the observability of the inputs employed in the measurement. Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Level 2 inputs are observable inputs other than quoted prices included within Level 1 for the asset or liability, either directly or indirectly through market-corroborated inputs. Level 3 inputs are unobservable inputs for the asset or liability reflecting our assumptions about pricing by market participants.
	OTC commodity swaps, physical commodity purchase and sale contracts and interest rate swaps and caps are generally valued using industry-standard models that consider various assumptions, including quoted forward prices, spot prices, interest rates, time value, volatility factors and contractual prices for the underlying instruments, as well as other relevant economic measures. The degree to which these inputs are observable in the forward markets determines the classification as Level 2 or 3. Our contracts are valued using quotations provided by brokers based on exchange pricing and/or price index developers such as Platts or Argus and are, therefore, classified as Level 2.
	The fair value hierarchy for our financial assets and liabilities accounted for at fair value on a recurring basis at December 31, 2014, was (in millions):


		As of December 31, 2014
		Level 1		Level 2			Level 3		Total
	Assets
	OTC commodity swaps	$	—	$	389.6		$	—	$	389.6

	Interest rate derivatives	—		—			—		—

	Total assets	—		389.6			—		389.6

	Liabilities
	Interest rate derivatives	—		(0.9		)	—		(0.9		)

	OTC commodity swaps	—		(353.3		)	—		(353.3		)

	Total liabilities	—		(354.2		)	—		(354.2		)

	Net assets	$	—	$	35.4		$	—	$	35.4



		As of December 31, 2013
		Level 1		Level 2			Level 3		Total
	Assets
	OTC commodity swaps	$	—	$	23.9		$	—	$	23.9

	Interest rate derivatives	—		0.1			—		0.1

	Total assets	—		24			—		24

	Liabilities
	Interest rate derivatives	—		(2.8		)	—		(2.8		)

	OTC commodity swaps	—		(24.9		)	—		(24.9		)

	Total liabilities	—		(27.7		)	—		(27.7		)

	Net liabilities	$	—	$	(3.7	)	$	—	$	(3.7	)

	The derivative values above are based on analysis of each contract as the fundamental unit of account as required by ASC 820. Derivative assets and liabilities with the same counterparty are not netted where the legal right of offset exists. This differs from the presentation in the financial statements which reflects our policy under the guidance of ASC 815-10-45, wherein we have elected to offset the fair value amounts recognized for multiple derivative instruments executed with the same counterparty, where right of offset exists. As of December 31, 2014 and 2013, $11.1 million and $2.6 million, respectively, of cash collateral was held by counterparty brokerage firms and has been netted with the net derivative positions with each counterparty.

Derivative_Instruments_Notes

Derivative Instruments (Notes)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments [Abstract]
Derivative Instruments	Derivative Instruments
	We use derivatives to reduce normal operating and market risks with the primary objective of reducing the impact of market price volatility on our results of operations. As such, our use of derivative contracts is aimed at:


	•	limiting the exposure to price fluctuations of commodity inventory above or below target levels at each of our segments;

	•	managing our exposure to commodity price risk associated with the purchase or sale of crude oil, feedstocks and finished grade fuel products at each of our segments; and

	•	limiting the exposure to interest rate fluctuations on our floating rate borrowings.
	We primarily utilize OTC commodity swaps, generally with maturity dates of three years or less, and interest rate swap and cap agreements to achieve these objectives. OTC commodity swap contracts require cash settlement for the commodity based on the difference between a fixed or floating price and the market price on the settlement date. Interest rate swap and cap agreements economically hedge floating rate debt by exchanging interest rate cash flows, based on a notional amount from a floating rate to a fixed rate. At this time, we do not believe there is any material credit risk with respect to the counterparties to these contracts.
	In accordance with ASC 815, certain of our OTC commodity swap contracts have been designated as cash flow hedges and the change in fair value between the execution date and the end of period has been recorded in other comprehensive income. The fair value of these contracts is recognized in income at the time the positions are closed and the hedged transactions are recognized in income.
	From time to time, we also enter into futures contracts with supply vendors that secure supply of product to be purchased for use in the normal course of business at our refining and retail segments. These contracts are priced based on an index that is clearly and closely related to the product being purchased, contain no net settlement provisions and typically qualify under the normal purchase exemption from derivative accounting treatment under ASC 815.
	The following table presents the fair value of our derivative instruments as of December 31, 2014 and 2013. The fair value amounts below are presented on a gross basis and do not reflect the netting of asset and liability positions permitted under our master netting arrangements, including cash collateral on deposit with our counterparties. We have elected to offset the recognized fair value amounts for multiple derivative instruments executed with the same counterparty in our financial statements. As a result, the asset and liability amounts below differ from the amounts presented in our consolidated balance sheets (in millions):


				As of December 31, 2014								As of December 31, 2013
	Derivative Type	Balance Sheet Location		Assets				Liabilities				Assets		Liabilities
	Derivatives not designated as hedging instruments:
	OTC commodity swaps(1)	Other current assets		$	190.3			$	(163.3	)		$	17.4	$	(8.6	)

	OTC commodity swaps(1)	Other current liabilities		20.1				(37.8		)		—		(3.4		)

	OTC commodity swaps(1)	Other long term assets		21.5				(14.3		)		—		—

	OTC commodity swaps(1)	Other long term liabilities		32.8				(2.7		)		—		—

	Interest rate derivatives	Other current assets		—				(0.6		)		—		—

	Interest rate derivatives	Other current liabilities		—				(0.3		)		—		—

	Interest rate derivatives	Other long term assets		—				—				0.1		—

	Interest rate derivatives	Other long term liabilities		—				—				—		(2.8		)


	Derivatives designated as hedging instruments:
	OTC commodity swaps(1)	Other current assets		97.1				(76.1		)		3.5		(3.2		)

	OTC commodity swaps(1)	Other current liabilities		9.4				(7.1		)		—		—

	OTC commodity swaps(1)	Other long term assets		—				—				—		—

	OTC commodity swaps(1)	Other long term liabilities		18.4				(52.0		)		3		(9.7		)

	Total gross fair value of derivatives			389.6				(354.2		)		24		(27.7		)

	Less: Counterparty netting and cash collateral(2)			333				(344.1		)		14.2		(16.8		)

	Less: Amounts subject to master netting arrangements that are not netted on the balance sheet			$	3.2			$	(3.2	)		$	6	$	(6.0	)

	Total net fair value of derivatives			$	53.4			$	(6.9	)		$	3.8	$	(4.9	)


	(1)	As of December 31, 2014 and 2013, we had open derivative contracts representing 11,169,150 and 7,703,000 barrels, respectively, of crude oil and refined petroleum products. Of these open contracts, contracts representing 4,512,400 and 5,186,000 barrels were designated as hedging instruments as of December 31, 2014 and 2013, respectively.

	(2)	As of December 31, 2014 and 2013, $11.1 million and $2.6 million, respectively, of cash collateral has been netted with the derivatives with each counterparty. Included in these amounts is $2.0 million of cash collateral associated with our interest rate derivatives as of both December 31, 2014 and 2013.
	For the years ended December 31, 2014, 2013 and 2012, we recognized total gains (losses) on our commodity derivatives of $131.6 million, $(3.0) million and $1.4 million, respectively. The gains and losses on commodity derivatives were recorded in cost of goods sold on the condensed consolidated statement of income, primarily in the refining segment.

	Gains (losses) associated with derivatives not designated as hedging instruments for the years ended December 31, 2014, 2013 and 2012 are as follows (in millions):


				Year Ended December 31,
	Derivative Type	Income Statement Location		2014				2013				2012
	OTC commodity swaps	Cost of goods sold		$	102.7			$	(1.2	)		$	3.3

Interest rate derivatives	Interest expense		(0.4		)		(0.4		)		(2.6		)
	Total		$	102.3			$	(1.6	)		$	0.7

Gains (losses) on our derivatives designated as cash flow hedging instruments or the years ended December 31, 2014, 2013 and 2012 are as follows (in millions):


		Year Ended December 31,
		2014				2013				2012
OTC commodity swaps:
Gain (loss) recognized in OCI (effective portion)		$	15			$	(5.6	)		$	(4.0	)

Gain (loss) reclassified from accumulated OCI into cost of goods sold on closed positions (effective portion)		$	22.6			$	0.7			$	(1.1	)

Gain (loss) recognized in cost of goods sold related to ineffectiveness		$	6.3			$	(2.5	)		$	(0.8	)

For cash flow hedges, no component of the derivative instruments’ gains or losses was excluded from the assessment of hedge effectiveness for the years ended December 31, 2014, 2013 and 2012. For the year ended December 31, 2014, losses of $12.3 million, net of taxes, on cash flow hedges, primarily related to future purchases of crude oil and the associated sale of finished grade fuel, remain in accumulated other comprehensive income. Gains (losses) of $14.7 million, $0.4 million and $(0.7) million, net of tax, on settled contracts were reclassified into cost of sales during the years ended December 31, 2014, 2013 and 2012. We estimate that $9.0 million of deferred gains as of December 31, 2014 will be reclassified into cost of sales over the next 12 months as a result of hedged transactions that are forecasted to occur. For the years ended December 31, 2014, 2013 and 2012, there were no amounts reclassified from accumulated other comprehensive income into income as a result of the discontinuation of cash flow hedge accounting.

Income_Taxes_Notes

Income Taxes (Notes)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes

	Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes.

	Significant components of Delek's deferred tax assets and liabilities, reported separately in the accompanying consolidated financial statements, as of December 31, 2014 and 2013 were as follows (in millions):


		December 31,
		2014				2013
	Current Deferred Taxes:
	Reserves and accruals	9.7				4.3

	Inventories	22.2				2.7

	ASC 815	(11.6		)		—

	Valuation allowance	(0.1		)		(0.1		)
	Total current deferred tax assets	20.2				6.9


	Non-Current Deferred Taxes:
	Property, plant and equipment, and intangibles	(251.6		)		(207.8		)
	Partnership investment	(16.3		)		(12.6		)
	Deferred revenues	(13.8		)		(14.8		)
	Compensation and employee benefits	7.1				4.9

	Net operating loss carryforwards	6.2				6

	Reserves and accruals	4.9				5.3

	Other	—				2.3

	Valuation allowance	(2.8		)		(3.3		)
	Total non-current deferred tax liabilities	(266.3		)		(220.0		)
	Total net deferred tax liabilities	$	(246.1	)		$	(213.1	)

	The difference between the actual income tax expense and the tax expense computed by applying the statutory federal income tax rate to income from continuing operations was attributable to the following (in millions):



		Year Ended December 31,
		2014				2013				2012
	Provision for federal income taxes at statutory rate	$	114.7			$	72.3			$	149.7

	State income taxes, net of federal tax provision	6.7				2.6				11.4

	Non-controlling interest	(9.6		)		(6.4		)		(1.1		)
	Other items	(10.2		)		2.4				(8.4		)

	Income tax expense	$	101.6			$	70.9			$	151.6



	Income tax expense from continuing operations was as follows (in millions):


		Year Ended December 31,
		2014				2013				2012
	Current	$	64.2			$	32			$	135.8

	Deferred	37.4				38.9				15.8

		$	101.6			$	70.9			$	151.6


Deferred income tax expense above was reflective of the changes in deferred tax assets and liabilities during the current period.

During the year ended December 31, 2014 and 2013, we recorded decreases to the valuation allowance of $0.5 million and $2.0 million, respectively. We carry valuation allowances against certain state deferred tax assets and net operating losses that may not be recoverable with future taxable income. During the year ended December 31, 2014 and 2013, we decreased the valuation allowance on some of our state deferred tax assets that we believe will more likely than not be realized based on the future reversal of our deferred tax liabilities.

In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income, and tax planning strategies in making this assessment. Based upon the level of historical taxable income and projections for future taxable income over the periods for which the deferred tax assets are deductible, management believes it is more likely than not Delek will realize the benefits of these deductible differences, net of the existing valuation allowance. The amount of the deferred tax assets considered realizable, however, could be reduced in the near term if estimates of future taxable income during the carryforward period are reduced. Subsequently recognized tax benefit or expense relating to the valuation allowance for deferred tax assets will be reported as an income tax benefit or expense in the consolidated statement of income.

State net operating loss carryforwards at December 31, 2014 totaled $170.5 million, a portion of which was subject to a valuation allowance and which include $26.8 million related to non-qualified stock option deductions. Delek has $0.8 million of state net operating losses that are set to expire between 2015 and 2016. Remaining net operating losses will begin expiring in 2017-2034. To the extent net operating loss carryforwards, when realized, relate to non-qualified stock option deductions, the resulting benefits will be credited to stockholders' equity.

Delek files a consolidated U.S. federal income tax return, as well as income tax returns in various state jurisdictions. Delek is no longer subject to U.S. federal income tax examinations by tax authorities for years through 2009. The Internal Revenue Service has examined Delek's income tax returns through the tax year ending 2009.

ASC 740 provides a recognition threshold and guidance for measurement of income tax positions taken or expected to be taken on a tax return. ASC 740 requires the elimination of the income tax benefits associated with any income tax position where it is not "more likely than not" that the position would be sustained upon examination by the taxing authorities. During the years ending December 31, 2014 and 2013, respectively, $2.6 million and a nominal amount of unrecognized tax benefits were recorded, while $0.2 million and $0.3 million of unrecognized tax benefits lapsed due to statue of limitations expiration.

Increases and decreases to the beginning balance of unrecognized tax benefits during the year ended December 31, 2014 and 2013 were as follows:



	2014				2013				2012
Balance at the beginning of the year	$	0.3			$	0.6			$	0.7

Additions based on tax positions related to current year	—				—				0.1

Additions for tax positions related to prior years	2.6				—				—

Reductions for tax positions related to the lapse of applicable statute of limitations	(0.2		)		(0.3		)		(0.2		)
Balance at the end of the year	$	2.7			$	0.3			$	0.6


The amount of the unrecognized benefit above that if recognized would change the effective tax rate is $2.2 million and $0.3 million as of December 31, 2014 and 2013, respectively.

Delek recognizes accrued interest and penalties related to unrecognized tax benefits as an adjustment to the current provision for income taxes. Interest of $0.2 million was recognized related to unrecognized tax benefits during the year ended December 31, 2014. A nominal amount of interest was recognized related to unrecognized tax benefits during each of the years ended December 31, 2013 and 2012.

Uncertain tax positions have been examined by Delek for any material changes in the next 12 months and none are expected.

Commitments_and_Contingencies_

Commitments and Contingencies (Notes)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	Litigation
	In the ordinary conduct of our business, we are from time to time subject to lawsuits, investigations and claims, including environmental claims and employee-related matters.
	We experienced a security breach by third-party hackers that may have compromised the credit/debit card information of certain of our retail segment customers. The incident involved credit/debit card payments for transactions at certain retail locations between March 19-25, 2013, April 14-15, 2013 and April 20-21, 2013, and several lawsuits have been brought against us as a result of this incident. Although we are unable to definitively determine the extent of any potential losses related to this breach, we do not believe that this incident will have a material adverse effect on our business, financial position or results of operations.
	Although we cannot predict with certainty the ultimate resolution of lawsuits, investigations and claims asserted against us, including civil penalties or other enforcement actions, we do not believe that any currently pending legal proceeding or proceedings to which we are a party will have a material adverse effect on our business, financial condition or results of operations.
	Self-insurance
	Delek is self-insured for workers’ compensation claims up to $1.0 million on a per accident basis. We self-insure for general liability claims up to $4.0 million on a per occurrence basis. We self-insure for auto liability up to $4.0 million on a per accident basis.
	We have umbrella liability insurance available to each of our segments in an amount determined reasonable by management.
	Rate Regulation of Petroleum Pipelines
	The rates and terms and conditions of service on certain of our pipelines may be subject to regulation by the Federal Energy Regulatory Commission ("FERC") under the Interstate Commerce Act ("ICA") or by the state regulatory commissions in the states in which we transport crude oil and refined products, including the Railroad Commission of Texas, the Louisiana Public Service Commission, and the Arkansas Public Service Commission. Certain of our pipeline systems are subject to such regulation and have filed tariffs with the appropriate entities. We also comply with the reporting requirements for these pipelines. Other of our pipelines have received a waiver from application of FERC's tariff requirements but will comply with other regulatory requirements.
	FERC regulates interstate transportation under the ICA, the Energy Policy Act of 1992 and the rules and regulations promulgated under those laws. The ICA and its implementing regulations require that tariff rates for interstate service on oil pipelines, including pipelines that transport crude oil and refined products in interstate commerce (collectively referred to as “petroleum pipelines”), be just and reasonable and non-discriminatory and that such rates and terms and conditions of service be filed with FERC. Under the ICA, shippers may challenge new or existing rates or services. FERC is authorized to suspend the effectiveness of a challenged rate for up to seven months, though rates are typically not suspended for the maximum allowable period.
	While FERC regulates rates for shipments of crude oil or refined products in interstate commerce, state agencies may regulate rates and service for shipments in intrastate commerce. We own pipeline assets in Texas, Arkansas, and Louisiana.
	Environmental Health and Safety
	We are subject to various federal, state and local environmental and safety laws enforced by agencies including the United States Environmental Protection Agency (the "EPA"), the United States Department of Transportation, the Occupational Safety and Health Administration, the Texas Commission on Environmental Quality, the Railroad Commission of Texas, the Arkansas Department of Environmental Quality and the Tennessee Department of Environment and Conservation as well as other state and federal agencies. Numerous permits or other authorizations are required under these laws for the operation of our refineries, biodiesel facilities, terminals, pipelines, underground storage tanks ("USTs"), trucks, rail cars and related operations, and may be subject to revocation, modification and renewal.
	These laws and permits raise potential exposure to future claims and lawsuits involving environmental and safety matters which could include soil and water contamination, air pollution, personal injury and property damage allegedly caused by substances which we manufactured, handled, used, released or disposed of, transported, or that relate to pre-existing conditions for which we have assumed responsibility. We believe that our current operations are in substantial compliance with existing environmental and safety requirements. However, there have been and will continue to be ongoing discussions about environmental and safety matters between us and federal and state authorities, including notices of violations, citations and other enforcement actions, some of which have resulted or may result in changes to operating procedures and in capital expenditures. While it is often difficult to quantify future environmental or safety related expenditures, we anticipate that continuing capital investments and changes in operating procedures will be required for the foreseeable future to comply with existing and new requirements as well as evolving interpretations and more strict enforcement of existing laws and regulations.
	The Comprehensive Environmental Response, Compensation and Liability Act, also known as Superfund, imposes liability, without regard to fault or the legality of the original conduct, on certain classes of persons who are considered to be responsible for the release of a hazardous substance into the environment. Analogous state laws impose similar responsibilities and liabilities on responsible parties. In the course of our ordinary operations, our various businesses generate waste, some of which falls within the statutory definition of a hazardous substance and some of which may have been disposed of at sites that may require future cleanup under Superfund. At this time, our El Dorado refinery has been named as a minor potentially responsible party at one site for which we believe future costs will not be material.
	As of December 31, 2014, we have recorded an environmental liability of approximately $9.4 million, primarily related to the probable estimated costs of remediating or otherwise addressing certain environmental issues of a non-capital nature at the Tyler and El Dorado refineries and a pipeline leak location. This liability includes estimated costs for ongoing investigation and remediation efforts, which were already being performed by the former operators of the Tyler and El Dorado refineries prior to our acquisition of those facilities, for known contamination of soil and groundwater, as well as estimated costs for additional issues which have been identified subsequent to the acquisition. We expect approximately $0.5 million of this amount to be reimbursable by a prior owner of the El Dorado refinery and have recorded $0.1 million in other current assets and $0.4 million in other non-current assets in our condensed consolidated balance sheet as of December 31, 2014. Approximately $0.9 million of the total liability is expected to be expended over the next 12 months with most of the balance expended by 2022. In the future, we could be required to undertake additional investigations of our refineries, pipelines and terminal facilities or convenience stores, which could result in additional remediation liabilities.
	Most of the cost of remediating releases from USTs in our retail segment is reimbursed by state reimbursement funds which are funded by a tax on petroleum products and subject to certain deductible amounts. As of December 31, 2014, our accrual for such UST-related remediation was less than $0.1 million.
	The EPA issued final rules for gasoline formulation that required the reduction of average benzene content by January 1, 2011 and the reduction of maximum annual average benzene content by July 1, 2012. It is necessary for us to purchase credits to fully comply with these content requirements for the Tyler refinery. Although credits have been acquired that we believe will be sufficient to cover our obligations through at least 2016, there can be no assurance that such credits will be available in the future or that we will be able to purchase available credits at reasonable prices. Additional benzene reduction projects may be implemented to reduce or eliminate our need to purchase benzene credits depending on the availability and cost of such credits.
	Various legislative and regulatory measures to address climate change and greenhouse gas ("GHG") emissions (including carbon dioxide, methane and nitrous oxides) have been discussed or implemented. They include proposed and enacted federal regulation and state actions to develop statewide, regional or nationwide programs designed to control and reduce GHG emissions from fixed sources, such as our refineries, as well as mobile transportation sources and fuels. We are not aware of any state or regional initiatives for controlling existing GHG emissions that would affect our refineries. Although it is not possible to predict the requirements of any GHG legislation that may be enacted, any laws or regulations that may be adopted to restrict or reduce GHG emissions will likely require us to incur increased operating and capital costs. The EPA also has indicated that it intends to regulate refinery GHG emissions from new and existing sources through a New Source Performance Standard ("NSPS"), although there is no firm proposal or date for such regulation.
	Since the 2010 calendar year, EPA rules require us to report GHG emissions from our refinery operations and consumer use of fuel products produced at our refineries on an annual basis. While the cost of compliance with the reporting rule is not material, data gathered under the rule may be used in the future to support additional regulation of GHG. Effective January 2011, the EPA began regulating GHG emissions from refineries and other major sources through the Prevention of Significant Deterioration ("PSD") and Federal Operating Permit ("Title V") programs. In June 2014, the United States Supreme Court ruled that the EPA may not require PSD and Title V permits solely because of GHG emissions, but may require Best Available Control Technology (“BACT”) for GHG emissions above a certain threshold if emissions of other pollutants would otherwise require PSD permitting. While this decision does not impose any limits or controls on GHG emissions from current operations, GHG emission increases from future projects or operational changes, such as capacity increases, may be impacted and required to meet emission limits or technological requirements such as BACT. We do not believe this decision will materially affect our operations.
	In mid-2012, the EPA announced an industry-wide enforcement initiative directed at flaring operations and performance at refineries and petrochemical plants. In September 2012, the EPA finalized revisions to the NSPS for Petroleum Refineries ("NSPS Subpart Ja") that primarily affects flares and process heaters. We believe our existing process heaters meet the applicable requirements and our refineries have not received any associated inquiries or requests for information, nor are they a party to any associated enforcement action at this time. The NSPS will impact the way some flares at our Tyler and El Dorado refineries are designed and/or operated. Affected flares have three years to comply with the new standard and we have capital projects at our refineries related to flare compliance that will be implemented between 2014 and 2016.
	In June 2014, the EPA proposed rules to further regulate refinery air emissions through additional NSPS and Maximum Achievable Control Technology requirements. The proposed rules would require capital expenditures for additional controls on the Tyler refinery’s coker and for the relief systems, flares, tanks and other sources at both refineries, as well as requiring changes to the way we operate or start up some process units. The proposed rule would also require that we monitor property line benzene concentrations and provide the results to the EPA, which will make the results available to the public. The EPA anticipates finalizing the proposed rules in June 2015 with approximately three years to comply with most of the requirements. If the proposed rules are finalized, we do not anticipate that any required capital and operating costs will be material and do not believe compliance will affect our production capacities or have a material adverse effect upon our business, financial condition or results of operations.
	The Energy Independence and Security Act of 2007 ("EISA") increased the amounts of renewable fuel required to be blended into domestic transportation fuel supplies by the Energy Policy Act of 2005 to 32 billion gallons by 2022. The Renewable Fuel Standard - 2 (RFS-2) rule finalized by the EPA in 2010 to implement EISA, requires that most refiners blend increasing amounts of biofuels with refined products, equal to approximately 9.2% of combined gasoline and diesel volume in 2012, increasing to 10% and 11% in 2014 and 2015, respectively, and escalating annually to approximately 18% by 2022. Because the mandate requires specified volumes of biofuels, if the demand for motor fuels decreases in future years, even higher percentages of biofuels may be required. Alternatively, credits called Renewable Identification Numbers ("RINs") can be used instead of physically blending biofuels. The Tyler refinery began supplying a 10% ethanol gasoline blend (E-10) in January 2008 and 5% biodiesel blends in June 2011. The El Dorado refinery completed projects at its truck loading rack in June 2011 to make E-10 available and in July 2012 to make biodiesel blends available. In 2013, we internally generated, through our logistics, retail and refining segments, most of the RINs required to meet the obligations of our refineries, including a carryover of 2012 RINs, with a net surplus of biodiesel RINs that were available to be sold to purchase RINs in other categories.
	The EPA has proposed slightly lower overall renewable fuel obligations for 2014 in recognition of blending issues associated with exceeding the 10% "blendwall" in gasoline; however, the EPA is not expected to finalize the required volumes until sometime in the second quarter of 2015. The EPA could require increased volumes compared with the proposed volumes. If the volumes in the proposed rule are finalized, it is likely we will obtain most of the RINs required for 2014 compliance through internal operations of our refineries and other business units. If the final rule requires higher volumes than proposed, it will be necessary for our refineries to purchase additional RINs in the market, but it is not possible at this time to predict what those volumes may be.
	In March 2013, the EPA proposed Tier 3 gasoline rules, which were finalized in March 2014. The final Tier 3 rule requires a reduction in annual average gasoline sulfur content from 30 ppm to 10 ppm and retains the current maximum per-gallon sulfur content of 80 ppm. Larger refineries must comply with the 10 ppm sulfur standard by January 1, 2017 but the final rule provides a three-year waiver period, to January 1, 2020, for small volume refineries that processed less than 75,000 bpd in 2011 or 2012. Both of our refineries meet this waiver provision and will have until January 1, 2020 to comply. We anticipate that the Tyler refinery will meet these new limits when they become effective with only minor operational changes and that a minor capital project may be required for additional sulfur removal capacity at the El Dorado refinery.
	Following the November 2008 explosion and fire at the Tyler refinery, the EPA conducted an investigation under Section 114 of the Clean Air Act pertaining to our compliance with the chemical accident prevention standards. In late 2011, the EPA referred an enforcement action to the DOJ and in the fourth quarter of 2014, we settled this matter by entering into a Consent Decree with the government. The Consent Decree requires Delek to pay a penalty of $0.5 million and make a minor change to its written inspection procedures. The Consent Decree has no effect on production at the refinery and no cost implications other than the penalty amount.
	We have detected several crude oil releases from pipelines owned by our logistics segment, including a release at Magnolia Station in March 2013, a release near Macedonia, Arkansas in October 2013 and a release in Haynesville, Louisiana in April 2014. Based on current information available to us, we do not believe the total costs associated with these events, whether alone or in the aggregate, including any fines or penalties and net of partial insurance reimbursement, will have a material adverse effect upon our business, financial condition or results of operations.
	Vendor Commitments
	Our retail segment maintains an agreement with a significant vendor that requires the purchase of certain general merchandise exclusively from this vendor over a specified period of time. Additionally, we maintain agreements with certain fuel suppliers that contain terms which generally require the purchase of predetermined quantities of third-party branded fuel for a specified period of time. In certain fuel vendor contracts, penalty provisions exist if minimum quantities are not met.
	Letters of Credit
	As of December 31, 2014, Delek had in place letters of credit totaling approximately $102.7 million with various financial institutions primarily securing obligations with respect to its workers’ compensation and general liability self-insurance programs, crude oil purchases for the refining segment, and gasoline and diesel purchases for the logistics segment. No amounts were drawn by beneficiaries of these letters of credit at December 31, 2014.
	Operating Leases
	Delek leases land, buildings, retail store locations, equipment and corporate office space under agreements expiring at various dates through 2037 after considering available renewal options. Many of these leases contain renewal options and require Delek to pay executory costs (such as property taxes, maintenance, and insurance). Lease expense for all operating leases for the years ended December 31, 2014, 2013 and 2012 totaled $24.7 million, $19 million, and $17.1 million, respectively.

	The following is an estimate of our future minimum lease payments for operating leases having remaining noncancelable terms in excess of one year as of December 31, 2014 (in millions):



	2015	$	20.8

	2016	19.8

	2017	17.7

	2018	15.9

	2019	13.2

	Thereafter	64.6

	Total future minimum rentals	$	152

Employees_Notes

Employees (Notes)	12 Months Ended
Employees (Notes)	Dec. 31, 2014
Employees [Abstract]
Employees [Text Block]	Employees

	Workforce

	A portion of our workforce in the refining segment is represented by the United Steel, Paper and Forestry, Rubber Manufacturing, Energy, Allied Industrial and Service Workers International Union and its Local 202. As of December 31, 2014, 161 operations and maintenance hourly employees and 40 truck drivers at the Tyler refinery were represented by the United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied Industrial and Service Workers International Union and its Local 202. The Tyler operations and maintenance hourly employees are currently covered by a collective bargaining agreement that expired January 31, 2015. National-level negotiations are currently ongoing between the International Union and a third party. While these negotiations are in process, we are operating under rolling, 24-hour extensions to this agreement. The Tyler truck drivers are currently covered by a collective bargaining agreement that expires March 1, 2015. Renewal negotiations for this agreement are in process but not yet finalized. In the event that the union strikes, Delek has a plan in place for continued operation of the Tyler refinery utilizing company employees and/or third party contractors. We do not anticipate these negotiations will prevent the continuous operation of the Tyler refinery. As of December 31, 2014, 167 operations and maintenance hourly employees at the El Dorado refinery were represented by the International Union of Operating Engineers and its Local 381. These employees are covered by a collective bargaining agreement which expires on August 1, 2017. None of our employees in our marketing or retail segments or in our corporate office are represented by a union. We consider our relations with our employees to be satisfactory.

	401(k) Plan

	We sponsor a voluntary 401(k) Employee Retirement Savings Plan for eligible employees administered by Wells Fargo Bank, N.A. Employees must be at least 21 years of age and have 45 days of service to be eligible to participate in the plan. Employee contributions are matched on a fully-vested basis by us up to a maximum of 6% of eligible compensation. Eligibility for the company matching contribution begins on the first of the month following one year of employment. For the years ended December 31, 2014, 2013 and 2012, the 401(k) expense recognized was $4.2 million, $3.9 million, and $3.4 million, respectively.

Related_Party_Transactions_Not

Related Party Transactions (Notes)	12 Months Ended
Related Party Transactions (Notes)	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions
Related Party Transactions	From the time of our initial public offering in May 2006 through March 20, 2013, Delek Group Ltd. ("Delek Group") controlled more than 50% of our voting power. As a result, Delek Group and its controlling stockholder Mr. Itshak Sharon (Tshuva), could, without the consent of our other stockholders, control the election of our directors, influence our corporate and management policies and determine the outcome of any matter or corporate transaction submitted to our stockholders for approval, including potential mergers or acquisitions, asset sales and other significant corporate transactions. On March 20, 2013 (the "2013 Offering") and May 20, 2014, Delek Group completed the sale of 9,000,000 and 10,580,000 shares of our outstanding common stock, respectively, in separate secondary offerings. Concurrently with the 2013 Offering, we repurchased 1,000,000 shares of our outstanding common stock from Delek Group in a privately negotiated transaction. Additionally, from 2012 through 2014, Delek Group engaged in several block trade sales of our common stock, further reducing their holdings of our outstanding common stock. As of December 31, 2014, no representative of Delek Group served on our Board of Directors, but, based on information filed in a Schedule 13G/A with the SEC on February 17, 2015, Delek Group beneficially owned approximately 5.2% of our outstanding shares of common stock on that date.

Selected_Quarterly_Financial_D

Selected Quarterly Financial Data (Unaudited) (Notes)	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Quarterly Financial Information [Text Block]	Selected Quarterly Financial Data (Unaudited)

	Quarterly financial information for the years ended December 31, 2014 and 2013 is summarized below. The quarterly financial information summarized below has been prepared by Delek's management and is unaudited (in millions, except per share data).



		For the Three Month Periods Ended
		March 31, 2014		June 30, 2014		September 30, 2014			December 31, 2014

	Net sales	$	1,865.70	$	2,374.70	$	2,322.20		$	1,761.70

	Operating income	$	67.7	$	106	$	120.9		$	71.9

	Net income	$	39.3	$	63.2	$	78.2		$	45.3

	Net income attributable to Delek	$	33.7	$	54.9	$	72.5		$	37.5

	Basic earnings per share	$	0.57	$	0.93	$	1.23		$	0.65

	Diluted earnings per share	$	0.56	$	0.92	$	1.22		$	0.64




		For the Three Month Periods Ended
		March 31, 2013		June 30, 2013		September 30, 2013			December 31, 2013


	Net sales	$	2,259.90	$	2,187.40	$	2,321.80		$	1,937.70

	Operating income	$	134.4	$	77.8	$	12.9		$	12.6

	Net income	$	82.1	$	51	$	3		$	(0.4	)

	Net income (loss) attributable to Delek	$	77.5	$	46.6	$	(1.7	)	$	(4.7	)

	Basic earnings (loss) per share	$	1.3	$	0.79	$	(0.03	)	$	(0.08	)

	Diluted earnings (loss) per share	$	1.28	$	0.78	$	(0.03	)	$	(0.08	)

Subsequent_Events_Notes

Subsequent Events (Notes)	12 Months Ended
Subsequent Events (Notes)	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events
	Dividend Declaration
	On February 23, 2015, Delek's Board of Directors voted to declare a quarterly cash dividend of $0.15 per share, payable on March 24, 2015, to stockholders of record on March 10, 2015.

	Share Repurchase Authorization

	In 2015, our Board of Directors approved a new share repurchase authorization for $125.0 million that will expire on December 31, 2015. Shares under the program may be repurchased from time to time in the open market or through privately negotiated transactions, subject to market conditions and other factors.

Schedule_1_Notes

Schedule 1 (Notes)	12 Months Ended
	Dec. 31, 2014
Schedule 1 [Abstract]
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	Delek US Holdings, Inc.
	Parent Company Only
	Condensed Balance Sheets


			December 31,
			2014				2013
			(In millions, except share and per share data)
	ASSETS
	Current assets:
	Cash and cash equivalents		$	186.9			$	184.3

	Accounts receivable		0.9				0.8

	Interest receivable from subsidiaries		2.1				—

	Income tax receivable from subsidiaries		14				44.7

	Other current assets		70.9				16.5

	Total current assets		274.8				246.3

	Property, plant and equipment:
	Property, plant and equipment		28.4				23.5

	Less: accumulated depreciation		(9.6		)		(4.7		)
	Property, plant and equipment, net		18.8				18.8

	Notes receivable from related parties		74.4				72.7

	Investment in subsidiaries		865.5				799.3

	Deferred tax asset		—				0.2

	Other non-current assets		2.3				0.5

	Total assets		$	1,235.80			$	1,137.80

	LIABILITIES AND SHAREHOLDERS’ EQUITY
	Current liabilities:
	Accounts payable		$	3.1			$	6.4

	Accounts payable to subsidiaries		74.6				64.7

	Current portion of long-term debt and capital lease obligations		—				18.3

	Accrued expenses and other current liabilities		24.5				7.9

	Total current liabilities		102.2				97.3

	Non-current liabilities:
	Long-term debt and capital lease obligations, net of current portion		17				—

	Notes payable to subsidiaries		102				105.5

	Deferred tax liabilities		7.3				—

	Other non-current liabilities		5.6				—

	Total non-current liabilities		131.9				105.5

	Shareholders’ equity:
	Preferred stock, $0.01 par value, 10,000,000 shares authorized, no shares issued and outstanding		—				—

Common stock, $0.01 par value, 110,000,000 shares authorized, 60,637,525 shares and 60,229,107 shares issued at December 31, 2014 and 2013, respectively		0.6				0.6

Additional paid-in capital		395.1				384.5

Accumulated other comprehensive loss		(12.6		)		(4.0		)
Treasury stock, 3,365,561 and 1,000,000 shares, at cost, as of December 31, 2014 and 2013, respectively.		(112.6		)		(37.9		)
Retained earnings		731.2				591.8

Total shareholders’ equity		1,001.70				935

Total liabilities and shareholders’ equity		$	1,235.80			$	1,137.80


The "Notes to Consolidated Financial Statements" of Delek US Holdings, Inc., beginning on page F-12 of this
Form 10-K are an integral part of these condensed financial statements.
Delek US Holdings, Inc.
Parent Company Only
Condensed Statements of Income


		Year Ended December 31,
		2014				2013				2012
		(In millions)
Net sales		$	—			$	—			$	—

Operating costs and expenses:
Cost of goods sold		(81.1		)		8.8				(2.1		)

General and administrative expenses		50.9				40.8				31.1

Depreciation and amortization		4.9				3.4				0.9

Total operating costs and expenses		(25.3		)		53				29.9

Operating income (loss)		25.3				(53.0		)		(29.9		)

Interest expense		0.6				1.8				5.1

Interest income		(0.2		)		—				—

Net interest expense from related parties		1.8				2.8				2.8

Earnings from investment in subsidiaries		(181.1		)		(156.5		)		(289.6		)
Total non-operating income, net		(178.9		)		(151.9		)		(281.7		)
Income before income taxes		204.2				98.9				251.8

Income tax expense (benefit)		5.6				(18.8		)		(21.0		)

Net income		$	198.6			$	117.7			$	272.8



The "Notes to Consolidated Financial Statements" of Delek US Holdings, Inc., beginning on page F-12 of this
Form 10-K are an integral part of these condensed financial statements.

Delek US Holdings, Inc.
Parent Company Only
Condensed Consolidated Statements of Comprehensive Income



		Year Ended December 31,
		2014				2013				2012
		(In millions)
Net income attributable to Delek		$	198.6			$	117.7			$	272.8

Other comprehensive income:
Net loss on derivative instruments, net of tax benefit of $4.0, $2.9, and $0.7 for years ended December 31, 2014, 2013 and 2012, respectively, and net of ineffectiveness of $6.3, $(2.5) and $(0.8) for the years ended December 31, 2014, 2013 and 2012, respectively.		(8.3		)		(4.4		)		(1.4		)
Foreign currency translation		$	(0.3	)		$	—			$	—

Comprehensive income		$	190			$	113.3			$	271.4


The "Notes to Consolidated Financial Statements" of Delek US Holdings, Inc., beginning on page F-12 of this
Form 10-K are an integral part of these condensed financial statements.

Delek US Holdings, Inc.
Parent Company Only
Condensed Statements of Cash Flows


		Year Ended December 31,
		2014				2013				2012
		(In millions)
Cash flows from operating activities:
Net income		$	198.6			$	117.7			$	272.8

Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		4.9				3.4				0.9

Amortization of deferred financing costs		0.4				0.4				0.3

Deferred income taxes		12.8				12.1				4.9

Equity-based compensation expense		7.3				6.5				3.8

Income tax benefit of equity-based compensation		(0.8		)		(4.7		)		(8.2		)
Income from subsidiaries		(181.1		)		(156.5		)		(289.6		)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable, net		(0.1		)		(0.8		)		0.5

Inventories and other current assets		5.6				(24.2		)		(17.3		)

Market value of derivatives		(47.7		)		(5.3		)		0.5

Receivables and payables from related parties		6.5				(8.6		)		16.6

Accounts payable and other current liabilities		6				(6.7		)		12.3

Non-current assets and liabilities, net		7.8				(6.4		)		(0.1		)

Net cash provided by (used in) operating activities		20.2				(73.1		)		(2.6		)

Cash flows from investing activities:
Business combinations		—				(5.1		)		—

Purchase of property, plant and equipment		(4.9		)		(8.0		)		(9.4		)
Investment in subsidiaries		(24.3		)		(46.4		)		(23.5		)
Dividends from subsidiaries		155.3				317.2				83.1

Distributions from subsidiaries		—				—				50

Net repayments of notes receivable from subsidiaries		(1.7		)		(27.7		)		—

Net cash provided by investing activities		124.4				230				100.2

Cash flows from financing activities:
Proceeds from revolver		57				12				8.5

Payments on revolver		(50.0		)		(6.0		)		(4.5		)
Repayment of note payable to related party		(11.8		)		—				(66.5		)

Proceeds from notes payable to subsidiaries		—				—				136

Repayment of note payable to subsidiaries		—				(23.1		)		(21.0		)

Repayments of other debt instruments		—				(29.1		)		(30.4		)

Proceeds from exercise of stock options		1.1				7.4				6.7

Taxes paid due to the net settlement of equity-based compensation		(5.2		)		(5.0		)		(8.2		)
Income tax benefit of equity-based compensation		0.8				4.7				8.2

Repurchase of common stock		(74.7		)		(37.9		)		—

Dividends paid		(59.2		)		(57.3		)		(35.5		)
Deferred financing costs paid		—				—				(0.4		)

Net cash used in financing activities		(142.0		)		(134.3		)		(7.1		)
Net increase in cash and cash equivalents		2.6				22.6				90.5

Cash and cash equivalents at the beginning of the period		184.3				161.7				71.2

Cash and cash equivalents at the end of the period		$	186.9			$	184.3			$	161.7



The "Notes to Consolidated Financial Statements" of Delek US Holdings, Inc., beginning on page F-12 of this
Form 10-K are an integral part of these condensed financial statements.

Accounting_Policies_Policies

Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation, Policy [Policy Text Block]	Basis of Presentation
	Our consolidated financial statements include the accounts of Delek and its subsidiaries. All significant intercompany transactions and account balances have been eliminated in consolidation. We have evaluated subsequent events through the filing of this Form 10-K. Any material subsequent events that occurred during this time have been properly recognized or disclosed in our financial statements.
	Our consolidated financial statements include Delek Logistics Partners, LP ("Delek Logistics"), a variable interest entity. As the general partner of Delek Logistics, we have the sole ability to direct the activities of Delek Logistics that most significantly impact its economic performance. We are also considered to be the primary beneficiary for accounting purposes and are Delek Logistics' primary customer. As Delek Logistics does not derive a significant amount of gross margin from third parties, there is limited risk to Delek associated with Delek Logistics' operations. However, in the event that Delek Logistics incurs a loss, our operating results will reflect Delek Logistics' loss, net of intercompany eliminations, to the extent of our ownership interest in Delek Logistics.
	The preparation of financial statements in conformity with U.S. generally accepted accounting principles ("GAAP") and in accordance with the rules and regulations of the Securities and Exchange Commission ("SEC") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Reclassification, Policy [Policy Text Block]	Reclassifications
	Certain prior period amounts have been reclassified in order to conform to the current year presentation. For example, our December 31, 2013 balance sheet has been adjusted to increase goodwill by $1.2 million, offset by a corresponding decrease to property, plant and equipment, due to the finalization of the purchase price allocation of our Hopewell Pipeline (as defined in Note 4 below). These reclassifications had no effect on net income or shareholders' equity as previously reported.
Segment Reporting, Policy [Policy Text Block]	Segment Reporting
	Delek is a diversified energy business focused on petroleum refining, wholesale sales of refined products and retail marketing. Management views operating results in primarily three segments: refining, logistics and retail. As of December 31, 2014, the refining segment operated high conversion, independent refineries in Tyler, Texas (the "Tyler refinery") and El Dorado, Arkansas (the "El Dorado refinery") and biodiesel facilities in Cleburne, Texas and Crossett, Arkansas. The logistics segment owns and operates crude oil and refined products logistics and marketing assets. The retail segment markets gasoline, diesel and other refined petroleum products, and convenience merchandise through a network of 365 company-operated retail fuel and convenience stores. Segment reporting is more fully discussed in Note 12.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and Cash Equivalents
	Delek maintains cash and cash equivalents in accounts with large, multi-national financial institutions and retains nominal amounts of cash at the convenience store locations as petty cash. All highly liquid investments purchased with a term of three months or less are considered to be cash equivalents. As of December 31, 2014 and 2013, these cash equivalents consisted primarily of bank certificates of deposit and bank money market accounts, as well as overnight investments in U.S. Government obligations and bank repurchase obligations collateralized by U.S. Government obligations.
Accounts Receivable, Policy [Policy Text Block]	Accounts Receivable
	Accounts receivable primarily consists of receivables related to credit card sales, receivables from vendor promotions and trade receivables generated in the ordinary course of business. Delek recorded an allowance for doubtful accounts related to trade receivables of a nominal amount as of both December 31, 2014 and 2013, respectively.
Inventory, Policy [Policy Text Block]	Inventory
	Refinery inventory consists of crude oil, refined products and blendstocks which are stated at the lower of cost or market. Inventory cost at the Tyler refinery is determined under the last-in, first-out ("LIFO") valuation method. Cost of crude oil, refined product and blendstock inventories in excess of market value are charged to cost of goods sold. Such changes are subject to reversal in subsequent periods, not to exceed LIFO cost, if prices recover. Inventory costs at the El Dorado refinery are stated at the lower of cost or market on a first-in, first-out ("FIFO") basis.
	Logistics inventory consists of refined products which are stated at the lower of cost or market on a FIFO basis.
	Retail merchandise inventory consists of gasoline, diesel fuel, other petroleum products, cigarettes, beer, convenience merchandise and food service merchandise. Fuel inventories are stated at the lower of cost or market on a FIFO basis. Non-fuel inventories are stated at estimated cost as determined by the retail inventory method.
Property, Plant and Equipment, Policy [Policy Text Block]	Property, Plant and Equipment
	Assets acquired by Delek in conjunction with acquisitions are recorded at estimated fair market value in accordance with the purchase method of accounting as prescribed in Accounting Standards Codification ("ASC") 805, Business Combinations ("ASC 805"). Other acquisitions of property and equipment are carried at cost. Betterments, renewals and extraordinary repairs that extend the life of an asset are capitalized. Maintenance and repairs are charged to expense as incurred. Delek owns certain fixed assets on leased locations and depreciates these assets and asset improvements over the lesser of management's estimated useful lives of the assets or the remaining lease term.

	Depreciation is computed using the straight-line method over management's estimated useful lives of the related assets, which are as follows:



		Years
	Automobiles	5-Mar
	Computer equipment and software	10-Mar
	Refinery turnaround costs	5-Apr
	Furniture and fixtures	15-May
	Asset retirement obligation assets	15-50
	Refinery machinery and equipment	May-40
	Pipelines and terminals	15-40
	Retail store equipment and site improvements	30-Jul
	Building and building improvements	15-40

Other Intangible Assets, Policy [Policy Text Block]	Other Intangible Assets
	Delek has intangible assets consisting of long-term supply contracts, non-compete agreements, trademarks, capacity contracts and rights of way. We amortize the definite-lived intangible assets on straight-line bases over the estimated useful lives of three to 11.5 years. The amortization expense is included in depreciation and amortization on the accompanying consolidated statements of income.

Property, Plant and Equipment and other Intangibles Impairment, Policy [Policy Text Block]	Property, Plant and Equipment and Other Intangibles Impairment
	Property, plant and equipment and definite life intangibles are evaluated for impairment whenever indicators of impairment exist. In accordance with ASC 360 and ASC 350, Intangibles - Goodwill and Other, Delek evaluates the realizability of these long-lived assets as events occur that might indicate potential impairment. In doing so, Delek assesses whether the carrying amount of the asset is unrecoverable by estimating the sum of the future cash flows expected to result from the asset, undiscounted and without interest charges. If the carrying amount is more than the recoverable amount, an impairment charge must be recognized based on the fair value of the asset.
	Property and equipment of retail stores identified for closing are written down to their estimated net realizable value at the time such stores are closed. Delek analyzes regional market, division and store operations for changes in market demographics, competition, economic conditions and other factors, including the variability of cash flow.
Capitalized Interest, Policy [Policy Text Block]	Capitalized Interest
	Delek capitalizes interest on capital projects associated with the refining segment and with the construction related to the new "prototype" stores being built in the retail segment.
Refinery Turnaround Costs, Policy [Policy Text Block]	Refinery Turnaround Costs
	Refinery turnaround costs are incurred in connection with planned shutdowns and inspections of the Tyler and El Dorado refineries' major units to perform necessary repairs and replacements. Refinery turnaround costs are deferred when incurred, classified as property, plant and equipment and amortized on a straight-line basis over that period of time estimated to lapse until the next planned turnaround occurs. Refinery turnaround costs include, among other things, the cost to repair, restore, refurbish or replace refinery equipment such as vessels, tanks, reactors, piping, rotating equipment, instrumentation, electrical equipment, heat exchangers and fired heaters.

Goodwill and and Potential Impairment, Policy [Policy Text Block]	Goodwill and Potential Impairment
	Goodwill in an acquisition represents the excess of the aggregate purchase price over the fair value of the identifiable net assets. Delek's goodwill, all of which was acquired in various purchase business combinations, is recorded at original fair value and is not amortized. Goodwill is subject to annual assessment to determine if an impairment of value has occurred and Delek performs this review annually in the fourth quarter. We could also be required to evaluate our goodwill if, prior to our annual assessment, we experience disruptions in our business, have unexpected significant declines in operating results, or sustain a permanent market capitalization decline. If a reporting unit's carrying amount exceeds its fair value, the impairment assessment leads to the testing of the implied fair value of the reporting unit's goodwill to its carrying amount. If the implied fair value is less than the carrying amount, a goodwill impairment charge is recorded
Derivatives, Policy [Policy Text Block]	Derivatives
	Delek records all derivative financial instruments, including interest rate swap and cap agreements, fuel-related derivatives, over the counter ("OTC") future swaps and forward contracts at estimated fair value in accordance with the provisions of ASC 815, Derivatives and Hedging ("ASC 815"). Changes in the fair value of the derivative instruments are recognized in operations, unless we elect to apply the hedging treatment permitted under the provisions of ASC 815 allowing such changes to be classified as other comprehensive income. We validate the fair value of all derivative financial instruments on a periodic basis, utilizing valuations from third party financial and brokerage institutions. On a regular basis, Delek enters into commodity contracts with counterparties for crude oil, blendstocks, and various finished products. These contracts usually qualify for the normal purchase / normal sale exemption under the standard and, as such, are not measured at fair value.
	Delek's policy under the guidance of ASC 815-10-45, Derivatives and Hedging - Other Presentation Matters ("ASC 815-10-45"), is to net the fair value amounts recognized for multiple derivative instruments executed with the same counterparty and offset these values against the cash collateral arising from these derivative positions.

Fair Value of Financial Instruments, Policy [Policy Text Block]	Fair Value of Financial Instruments
	The fair values of financial instruments are estimated based upon current market conditions and quoted market prices for the same or similar instruments. Management estimates that the carrying value approximates fair value for all of Delek's assets and liabilities that fall under the scope of ASC 825, Financial Instruments ("ASC 825").
	Delek applies the provisions of ASC 820, Fair Value Measurements and Disclosure ("ASC 820") in its presentation and disclosures regarding fair value, which pertain to certain financial assets and liabilities measured at fair value in the balance sheet on a recurring basis. ASC 820 defines fair value, establishes a framework for measuring fair value and expands disclosures about such measurements that are permitted or required under other accounting pronouncements. See Note 13 for further discussion.
	Delek also applies the provisions of ASC 825 as it pertains to the fair value option. This standard permits the election to carry financial instruments and certain other items similar to financial instruments at fair value on the balance sheet, with all changes in fair value reported in earnings. By electing the fair value option in conjunction with a derivative, an entity can achieve an accounting result similar to a fair value hedge without having to comply with complex hedge accounting rules. As of December 31, 2014 or 2013, we did not make the fair value election for any financial instruments not already carried at fair value in accordance with other standards.

Self-Insurance Reserves, Policy [Policy Text Block]	Self-Insurance Reserves
	Delek is primarily self-insured for workers' compensation and general liability costs, with varying limits of per claim and aggregate stop loss insurance coverage that management considers adequate. We maintain an accrual for these costs based on claims filed and an estimate of claims incurred but not reported. Differences between actual settlements and recorded accruals are recorded in the period identified.

Vendor Discounts and Deferred Revenue [Policy Text Block]	Vendor Discounts and Deferred Revenue
	Delek receives cash discounts or cash payments from certain vendors related to product promotions based upon factors such as quantities purchased, quantities sold, merchandise exclusivity, store space and various other factors. In accordance with ASC 605-50, Revenue Recognition - Customer Payments and Incentives, we recognize these amounts as a reduction of inventory until the products are sold, at which time the amounts are reflected as a reduction in cost of goods sold. Certain of these amounts are received from vendors related to agreements covering several periods. These amounts are initially recorded as deferred revenue, are reclassified as a reduction in inventory over the period the products are received, and are subsequently recognized as a reduction of cost of goods sold as the products are sold.
	Delek also receives advance payments from certain vendors relating to non-inventory agreements. These amounts are recorded as deferred revenue and are subsequently recognized as a reduction of cost of goods sold as earned.
Environmental Expenditures, Policy [Policy Text Block]	Environmental Expenditures
	It is Delek's policy to accrue environmental and clean-up related costs of a non-capital nature when it is both probable that a liability has been incurred and the amount can be reasonably estimated. Environmental liabilities represent the current estimated costs to investigate and remediate contamination at our properties. This estimate is based on internal and third-party assessments of the extent of the contamination, the selected remediation technology and review of applicable environmental regulations, typically considering estimated activities and costs for the next 15 years, unless a specific longer range estimate is practicable. Accruals for estimated costs from environmental remediation obligations generally are recognized no later than completion of the remedial feasibility study and include, but are not limited to, costs to perform remedial actions and costs of machinery and equipment that are dedicated to the remedial actions and that does not have an alternative use. Such accruals are adjusted as further information develops or circumstances change. We discount environmental liabilities to their present value if payments are fixed and determinable. Expenditures for equipment necessary for environmental issues relating to ongoing operations are capitalized.

Asset Retirement Obligations, Policy [Policy Text Block]	Asset Retirement Obligations
	Delek recognizes liabilities which represent the fair value of a legal obligation to perform asset retirement activities, including those that are conditional on a future event, when the amount can be reasonably estimated. In the retail segment, these obligations relate to the net present value of estimated costs to remove underground storage tanks at owned and leased retail sites which are legally required under the applicable leases. The asset retirement obligation for storage tank removal on leased retail sites is being accreted over the expected life of the owned retail site or the average retail site lease term. In the refining segment, these obligations relate to the required disposal of waste in certain storage tanks, asbestos abatement at an identified location and other estimated costs that would be legally required upon final closure of the Tyler and El Dorado refineries. In the logistics segment, these obligations related to the required cleanout of the pipeline and terminal tanks, and removal of certain above-grade portions of the pipeline situated on right-of-way property.
Revenue Recognition, Policy [Policy Text Block]	Revenue Recognition
	Revenues for products sold are recorded at the point of sale upon delivery of product, which is the point at which title to the product is transferred, and when payment has either been received or collection is reasonably assured.
	Delek derives service revenue from the sale of lottery tickets, money orders, car washes and other ancillary product and service offerings. Service revenue and related costs are recorded at gross amounts and net amounts, as appropriate, in accordance with the provisions of ASC 605-45, Revenue Recognition - Principal Agent Considerations ("ASC 605-45"). We record service revenue and related costs at gross amounts when Delek is the primary obligor, is subject to inventory risk, has latitude in establishing prices and selecting suppliers, influences product or service specifications, or has several but not all of these indicators. When Delek is not the primary obligor and does not possess other indicators of gross reporting as discussed previously, we record net service revenue.

Cost of Goods Sold and Operating Expenses, Policy [Policy Text Block]	Cost of Goods Sold and Operating Expenses
	For the retail segment, cost of goods sold comprises the costs of specific products sold. Operating expenses include costs such as wages of employees at the stores, lease expense for the stores, utility expense for the stores and other costs of operating the stores. For the refining segment, cost of goods sold includes all the costs of crude oil, feedstocks and external costs. Operating expenses include the costs associated with the actual operations of the Tyler and El Dorado refineries and biodiesel facilities. For the logistics segment, cost of goods sold includes all costs of refined products, additives and related transportation. Operating expenses include the costs associated with the actual operation of owned terminals, terminalling expense at third-party locations and pipeline maintenance costs.
Sales, Use and Excise Taxes Policy [Policy Text Block]	Sales, Use and Excise Taxes
	Delek's policy is to exclude sales, use and excise taxes from revenue when we are an agent of the taxing authority, in accordance with ASC 605-45.

Deferred Financing Costs, Policy [Policy Text Block]	Deferred Financing Costs
	Deferred financing costs are included in other non-current assets in the accompanying consolidated balance sheets and represent expenses related to issuing our long-term debt and obtaining our lines of credit. These amounts are amortized ratably over the remaining term of the respective financing and are included in interest expense. See Note 10 for further information.

Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block]	Advertising Costs
	Delek expenses advertising costs as the advertising space is utilized.
Operating Leases, Policy [Policy Text Block]	Operating Leases
	Delek leases land, buildings and various equipment under various operating lease arrangements, most of which provide the option, after the initial lease term, to renew the leases. Some of these lease arrangements include fixed rental rate increases, while others include rental rate increases based upon such factors as changes, if any, in defined inflationary indices.
	In accordance with ASC 840-20, Leases - Operating Leases, for all leases that include fixed rental rate increases, Delek calculates the total rent expense for the entire lease period, considering renewals for all periods for which failure to renew the lease imposes economic penalty, and records rental expense on a straight-line basis in the accompanying consolidated statements of income.
Income Tax, Policy [Policy Text Block]	Income Taxes
	Income taxes are accounted for under the provisions of ASC 740, Income Taxes ("ASC 740"). This statement generally requires Delek to record deferred income taxes for the differences between the book and tax bases of its assets and liabilities, which are measured using enacted tax rates and laws that will be in effect when the differences are expected to reverse. Deferred income tax expense or benefit represents the net change during the year in our deferred income tax assets and liabilities, exclusive of the amounts held in other comprehensive income.
	ASC 740 also prescribes a comprehensive model for how companies should recognize, measure, present and disclose in their financial statements uncertain tax positions taken or expected to be taken on a tax return and prescribes the minimum recognition threshold a tax position is required to meet before being recognized in the financial statements. Finally, ASC 740 requires an annual tabular roll-forward of unrecognized tax benefits.
Earnings Per Share, Policy [Policy Text Block]	Earnings Per Share
	Basic and diluted earnings per share are computed by dividing net income by the weighted average common shares outstanding. The common shares used to compute Delek’s basic and diluted earnings per share are as follows:
Share-based Compensation, Policy [Policy Text Block]	Stock-Based Compensation
	ASC 718, Compensation - Stock Compensation ("ASC 718"), requires the cost of all share-based payments to employees, including grants of employee stock options, to be recognized in the income statement and establishes fair value as the measurement objective in accounting for share-based payment arrangements. ASC 718 requires the use of a valuation model to calculate the fair value of stock-based awards on the date of grant. Delek uses the Black-Scholes-Merton option-pricing model to determine the fair value of stock option and stock appreciation right (SAR) awards, with the exception of the SARs granted to certain executive employees, which are valued under the Monte-Carlo simulation model.
	Restricted stock units ("RSUs") are measured based on the fair market value of the underlying stock on the date of grant. Vested RSUs are not issued until the minimum statutory withholding requirements have been remitted to us for payment to the taxing authority. As a result, the actual number of shares accounted for as issued may be less than the number of RSUs vested, due to any withholding amounts which have not been remitted.
	We generally recognize compensation expense related to stock-based awards with graded or cliff vesting on a straight-line basis over the vesting period. It is our practice to issue new shares when stock-based compensation is exercised.
Comprehensive Income, Policy [Policy Text Block]	Comprehensive Income
	For the years ended December 31, 2014, 2013 and 2012, comprehensive income includes net income and changes in the fair value of derivative instruments designated as cash flow hedges and foreign currency translation adjustments.
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements
	In May 2014, the FASB issued guidance regarding “Revenue from Contracts with Customers,” to clarify the principles for recognizing revenue. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also requires improved interim and annual disclosures that enable the users of financial statements to better understand the nature, amount, timing, and uncertainty of revenues and cash flows arising from contracts with customers. The new guidance is effective for annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period, and can be adopted either retrospectively to each prior reporting period presented using a practical expedient as allowed by the new guidance or retrospectively with a cumulative effect adjustment to retained earnings as of the date of initial application. Early adoption is not permitted. We are currently evaluating the effect that adopting this new standard will have on our consolidated financial statements and related disclosures.

Fair_Value_Measurements_Polici

Fair Value Measurements (Policies)	12 Months Ended
Fair Value Measurements (Policies)	Dec. 31, 2014
Fair Value Measurements [Abstract]
Fair Value Measurement, Policy [Policy Text Block]	ASC 820 requires disclosures that categorize assets and liabilities measured at fair value into one of three different levels depending on the observability of the inputs employed in the measurement. Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Level 2 inputs are observable inputs other than quoted prices included within Level 1 for the asset or liability, either directly or indirectly through market-corroborated inputs. Level 3 inputs are unobservable inputs for the asset or liability reflecting our assumptions about pricing by market participants.
Fair Value Measurement, Policy [Policy Text Block]	OTC commodity swaps, physical commodity purchase and sale contracts and interest rate swaps and caps are generally valued using industry-standard models that consider various assumptions, including quoted forward prices, spot prices, interest rates, time value, volatility factors and contractual prices for the underlying instruments, as well as other relevant economic measures. The degree to which these inputs are observable in the forward markets determines the classification as Level 2 or 3. Our contracts are valued using quotations provided by brokers based on exchange pricing and/or price index developers such as Platts or Argus and are, therefore, classified as Level 2.

Accounting_Policies_Tables

Accounting Policies (Tables)	12 Months Ended
Accounting Policies (Tables)	Dec. 31, 2014
Accounting Policies [Abstract]
Property, Plant and Equipment [Table Text Block]	Depreciation is computed using the straight-line method over management's estimated useful lives of the related assets, which are as follows:



		Years
	Automobiles	5-Mar
	Computer equipment and software	10-Mar
	Refinery turnaround costs	5-Apr
	Furniture and fixtures	15-May
	Asset retirement obligation assets	15-50
	Refinery machinery and equipment	May-40
	Pipelines and terminals	15-40
	Retail store equipment and site improvements	30-Jul
	Building and building improvements	15-40
	Property, plant and equipment, at cost, consist of the following (in millions):



			December 31,
			2014				2013
	Land		$	94.9			$	86.1
	Land		$	94.9			$	86.1
	Building and building improvements		266				255
	Building and building improvements		266				255
	Refinery machinery and equipment		771.4				641.4
	Refinery machinery and equipment		771.4				641.4
	Pipelines and terminals		266.2				204.6
	Pipelines and terminals		266.2				204.6
	Retail store equipment and site improvements		187.4				158.3
	Retail store equipment and site improvements		187.4				158.3
	Refinery turnaround costs		112				55.1
	Refinery turnaround costs		112				55.1
	Other equipment		77.8				58.4
	Other equipment		77.8				58.4
	Construction in progress		182.7				219.5
	Construction in progress		182.7				219.5
			1,958.40				1,678.40
			1,958.40				1,678.40
	Less: accumulated depreciation		(509.6		)		(405.2		)
			$	1,448.80			$	1,273.20
			$	1,448.80			$	1,273.20
	Property, plant and equipment, accumulated depreciation and depreciation expense by reporting segment as of and for the years ended December 31, 2014 and 2013 are as follows (in millions):


			As of and For the Year Ended December 31, 2014
			Refining(1)				Logistics(1)				Retail				Corporate,				Consolidated
			Refining(1)				Logistics(1)				Retail				Other and Eliminations				Consolidated
	Property, plant and equipment		$	1,098.10			$	293.5			$	511.9			$	54.9			$	1,958.40
	Property, plant and equipment		$	1,098.10			$	293.5			$	511.9			$	54.9			$	1,958.40
	Less: Accumulated depreciation		(252.9		)		(53.0		)		(194.5		)		(9.2		)		(509.6		)
	Property, plant and equipment, net		$	845.2			$	240.5			$	317.4			$	45.7			$	1,448.80
	Property, plant and equipment, net		$	845.2			$	240.5			$	317.4			$	45.7			$	1,448.80
	Depreciation expense		$	63.5			$	13.6			$	28.5			$	4.6			$	110.2
	Depreciation expense		$	63.5			$	13.6			$	28.5			$	4.6			$	110.2




			As of and For the Year Ended December 31, 2013
			Refining(1)				Logistics(1)				Retail				Corporate,				Consolidated
			Refining(1)				Logistics(1)				Retail				Other and Eliminations				Consolidated
	Property, plant and equipment		$	893.3			$	264.1			$	477.6			$	43.4			$	1,678.40
	Property, plant and equipment		$	893.3			$	264.1			$	477.6			$	43.4			$	1,678.40
	Less: Accumulated depreciation		(192.7		)		(39.6		)		(168.4		)		(4.5		)		(405.2		)
Property, plant and equipment, net		$	700.6			$	224.5			$	309.2			$	38.9			$	1,273.20
Property, plant and equipment, net		$	700.6			$	224.5			$	309.2			$	38.9			$	1,273.20
Depreciation expense		$	44.3			$	12.6			$	25.2			$	3.4			$	85.5
Depreciation expense		$	44.3			$	12.6			$	25.2			$	3.4			$	85.5

(1)	In conjunction with the El Dorado Acquisition, we have reclassified certain operating segments. The certain assets previously operated by our refining segment were contributed to Delek Logistics.
Schedule of Change in Asset Retirement Obligation [Table Text Block]	The reconciliation of the beginning and ending carrying amounts of asset retirement obligations is as follows (in millions):



			December 31,
			2014				2013
	Beginning balance		$	8.5			$	8.3
	Beginning balance		$	8.5			$	8.3
	Liabilities identified		0.2				0.2
	Liabilities identified		0.2				0.2
	Liabilities settled		(0.1		)		(0.6		)
	Accretion expense		0.6				0.6
	Accretion expense		0.6				0.6
	Ending balance		$	9.2			$	8.5
	Ending balance		$	9.2			$	8.5
Schedule of weighted average number of shares [Table Text Block]	Basic and diluted earnings per share are computed by dividing net income by the weighted average common shares outstanding. The common shares used to compute Delek’s basic and diluted earnings per share are as follows:


			Year Ended December 31,
			2014			2013			2012
	Weighted average common shares outstanding		58,780,947			59,186,921			58,719,968
	Weighted average common shares outstanding		58,780,947			59,186,921			58,719,968
	Dilutive effect of equity instruments		574,173			860,217			924,830
	Dilutive effect of equity instruments		574,173			860,217			924,830
	Weighted average common shares outstanding, assuming dilution		59,355,120			60,047,138			59,644,798
			59,355,120			60,047,138			59,644,798

Delek_Logistics_Tables

Delek Logistics (Tables)	12 Months Ended
	Dec. 31, 2014
Variable Interest Entity [Abstract]
Subsidiary balance sheet	With the exception of affiliate balances which are eliminated in consolidation, the Delek Logistics condensed consolidated balance sheets as of December 31, 2014 and 2013, as presented below, are included in the consolidated balance sheets of Delek.


			December 31,
			2014			2013
			(In millions)
	ASSETS
	Cash and cash equivalents		$	1.9		$	0.9

	Accounts receivable		28			29

	Inventory		10.3			17.5

	Other current assets		0.8			0.3

	Net property, plant and equipment		240.5			224.5

	Goodwill		11.7			11.7

	Intangible assets, net		11.3			12.4

	Other non-current assets		7.4			5

	Total assets		$	311.9		$	301.3

	LIABILITIES AND EQUITY
	Accounts payable		$	18.2		$	26

	Accounts payable to related parties		0.6			1.5

	Accrued expenses and other current liabilities		11.8			12.2

	Revolving credit facility		251.8			164.8

	Asset retirement obligations		3.3			3.1

	Deferred tax liabilities		0.2			0.3

	Other non-current liabilities		5.9			6.2

	Equity		20.1			87.2

	Total liabilities and equity		$	311.9		$	301.3

	Delek US Holdings, Inc.
	Parent Company Only
	Condensed Balance Sheets


			December 31,
			2014			2013
			(In millions, except share and per share data)
	ASSETS
	Current assets:
	Cash and cash equivalents		$	186.9		$	184.3

	Accounts receivable		0.9			0.8

	Interest receivable from subsidiaries		2.1			—

	Income tax receivable from subsidiaries		14			44.7

	Other current assets		70.9			16.5

Total current assets		274.8			246.3

Property, plant and equipment:
Property, plant and equipment		28.4			23.5

Less: accumulated depreciation		(9.6		)	(4.7		)
Property, plant and equipment, net		18.8			18.8

Notes receivable from related parties		74.4			72.7

Investment in subsidiaries		865.5			799.3

Deferred tax asset		—			0.2

Other non-current assets		2.3			0.5

Total assets		$	1,235.80		$	1,137.80

LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accounts payable		$	3.1		$	6.4

Accounts payable to subsidiaries		74.6			64.7

Current portion of long-term debt and capital lease obligations		—			18.3

Accrued expenses and other current liabilities		24.5			7.9

Total current liabilities		102.2			97.3

Non-current liabilities:
Long-term debt and capital lease obligations, net of current portion		17			—

Notes payable to subsidiaries		102			105.5

Deferred tax liabilities		7.3			—

Other non-current liabilities		5.6			—

Total non-current liabilities		131.9			105.5

Shareholders’ equity:
Preferred stock, $0.01 par value, 10,000,000 shares authorized, no shares issued and outstanding		—			—

Common stock, $0.01 par value, 110,000,000 shares authorized, 60,637,525 shares and 60,229,107 shares issued at December 31, 2014 and 2013, respectively		0.6			0.6

Additional paid-in capital		395.1			384.5

Accumulated other comprehensive loss		(12.6		)	(4.0		)
Treasury stock, 3,365,561 and 1,000,000 shares, at cost, as of December 31, 2014 and 2013, respectively.		(112.6		)	(37.9		)
Retained earnings		731.2			591.8

Total shareholders’ equity		1,001.70			935

Total liabilities and shareholders’ equity		$	1,235.80		$	1,137.80

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2014
Helena [Member]
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The allocation of the aggregate purchase price of the Helena Assets as of December 31, 2014 is summarized as follows (in millions):



	Property, plant and equipment	$	1

	Intangible assets	4

		$	5

Hopewell [Member]
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The allocation of the aggregate purchase price of the Hopewell Pipeline as of December 31, 2014 is summarized as follows (in millions):


	Property, plant and equipment	$	3.5

	Goodwill (all is expected to be deductible for tax purposes)	1.2

	Intangible assets	1

		$	5.7

Inventory_Tables

Inventory (Tables)	12 Months Ended
	Dec. 31, 2014
Inventory, Net [Abstract]
Schedule of Inventory, Current [Table Text Block]	Carrying value of inventories consisted of the following (in millions):


		December 31,		December 31,
		2014		2013
	Refinery raw materials and supplies	$	158.8	$	250.9

	Refinery work in process	26.5		58.6

	Refinery finished goods	235.1		299.2

	Retail fuel	10.9		19.2

	Retail merchandise	28		26.9

	Logistics refined products	10.3		17.5

	Total inventories	$	469.6	$	672.3

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	12 Months Ended
Property, Plant and Equipment (Tables)	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment [Table Text Block]	Depreciation is computed using the straight-line method over management's estimated useful lives of the related assets, which are as follows:



		Years
	Automobiles	5-Mar
	Computer equipment and software	10-Mar
	Refinery turnaround costs	5-Apr
	Furniture and fixtures	15-May
	Asset retirement obligation assets	15-50
	Refinery machinery and equipment	May-40
	Pipelines and terminals	15-40
	Retail store equipment and site improvements	30-Jul
	Building and building improvements	15-40
	Property, plant and equipment, at cost, consist of the following (in millions):



			December 31,
			2014				2013
	Land		$	94.9			$	86.1
	Land		$	94.9			$	86.1
	Building and building improvements		266				255
	Building and building improvements		266				255
	Refinery machinery and equipment		771.4				641.4
	Refinery machinery and equipment		771.4				641.4
	Pipelines and terminals		266.2				204.6
	Pipelines and terminals		266.2				204.6
	Retail store equipment and site improvements		187.4				158.3
	Retail store equipment and site improvements		187.4				158.3
	Refinery turnaround costs		112				55.1
	Refinery turnaround costs		112				55.1
	Other equipment		77.8				58.4
	Other equipment		77.8				58.4
	Construction in progress		182.7				219.5
	Construction in progress		182.7				219.5
			1,958.40				1,678.40
			1,958.40				1,678.40
	Less: accumulated depreciation		(509.6		)		(405.2		)
			$	1,448.80			$	1,273.20
			$	1,448.80			$	1,273.20
	Property, plant and equipment, accumulated depreciation and depreciation expense by reporting segment as of and for the years ended December 31, 2014 and 2013 are as follows (in millions):


			As of and For the Year Ended December 31, 2014
			Refining(1)				Logistics(1)				Retail				Corporate,				Consolidated
			Refining(1)				Logistics(1)				Retail				Other and Eliminations				Consolidated
	Property, plant and equipment		$	1,098.10			$	293.5			$	511.9			$	54.9			$	1,958.40
	Property, plant and equipment		$	1,098.10			$	293.5			$	511.9			$	54.9			$	1,958.40
	Less: Accumulated depreciation		(252.9		)		(53.0		)		(194.5		)		(9.2		)		(509.6		)
	Property, plant and equipment, net		$	845.2			$	240.5			$	317.4			$	45.7			$	1,448.80
	Property, plant and equipment, net		$	845.2			$	240.5			$	317.4			$	45.7			$	1,448.80
	Depreciation expense		$	63.5			$	13.6			$	28.5			$	4.6			$	110.2
	Depreciation expense		$	63.5			$	13.6			$	28.5			$	4.6			$	110.2




			As of and For the Year Ended December 31, 2013
			Refining(1)				Logistics(1)				Retail				Corporate,				Consolidated
			Refining(1)				Logistics(1)				Retail				Other and Eliminations				Consolidated
	Property, plant and equipment		$	893.3			$	264.1			$	477.6			$	43.4			$	1,678.40
	Property, plant and equipment		$	893.3			$	264.1			$	477.6			$	43.4			$	1,678.40
	Less: Accumulated depreciation		(192.7		)		(39.6		)		(168.4		)		(4.5		)		(405.2		)
Property, plant and equipment, net		$	700.6			$	224.5			$	309.2			$	38.9			$	1,273.20
Property, plant and equipment, net		$	700.6			$	224.5			$	309.2			$	38.9			$	1,273.20
Depreciation expense		$	44.3			$	12.6			$	25.2			$	3.4			$	85.5
Depreciation expense		$	44.3			$	12.6			$	25.2			$	3.4			$	85.5

(1)	In conjunction with the El Dorado Acquisition, we have reclassified certain operating segments. The certain assets previously operated by our refining segment were contributed to Delek Logistics.

Goodwill_Tables

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill [Abstract]
Schedule of Goodwill [Table Text Block]	A summary of our goodwill accounts in our retail and logistics segments are as follows (in millions):



			Retail		Logistics		Total
	Balance,	December 31, 2011	$	62.2	$	7.5	$	69.7

	Acquisitions		—		3		3

	Balance,	December 31, 2012	62.2		10.5		72.7

	Acquisitions		—		1.2		1.2

	Balance,	December 31, 2013	62.2		11.7		73.9

	Balance,	December 31, 2014	$	62.2	$	11.7	$	73.9

Other_Intangible_Assets_Tables

Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Other Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets [Table Text Block]	Other Intangible Assets

	A summary of our identifiable intangible assets are as follows (in millions):


	As of December 31, 2014	Useful Life	Gross		Accumulated Amortization			Net
	Intangible Assets subject to amortization:
	Supply contracts	11.5 years	$	12.2	$	(8.9	)	$	3.3

	Trademarks	4 years	0.7		(0.7		)	—

	Non-compete Agreements	3-10 years	1.3		(1.3		)	—

	Capacity contract	8 years	9.3		(8.5		)	0.8

	Intangible assets not subject to amortization:

	Rights-of-Way	Indefinite	12.1		—			12.1

	Total		$	35.6	$	(19.4	)	$	16.2





	As of December 31, 2013	Useful Life	Gross		Accumulated Amortization			Net
	Intangible Assets subject to amortization:
	Supply contracts	11.5 years	$	12.2	$	(7.9	)	$	4.3

	Trademarks	4 years	0.7		(0.7		)	—

	Non-compete Agreements	3-10 years	1.3		(1.3		)	—

	Capacity contract	8 years	9.3		(8.2		)	1.1

	Intangible assets not subject to amortization:
	Rights-of-Way	Indefinite	12		—			12

	Total		$	35.5	$	(18.1	)	$	17.4

LongTerm_Obligations_and_Notes1

Long-Term Obligations and Notes Payable (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table Text Block]	Outstanding borrowings under Delek’s existing debt instruments and capital lease obligations are as follows (in millions):


		December 31,		December 31,
		2014		2013
	MAPCO Revolver	$	76	$	67.5

	Wells Term Loan	64.2		—

	DKL Revolver	251.8		164.8

	Reliant Bank Revolver	17		10

	Promissory Notes	76		77.4

	Lion Term Loan Facility, net of $0.3 million debt discount	104.2		90

	Capital Lease Obligations	0.5		0.6

		589.7		410.3

	Less: Current portion of long-term debt, notes payable and capital lease obligations	56.4		33.7

		$	533.3	$	376.6

Schedule of Maturities of Long-term Debt [Table Text Block]	Principal maturities of Delek's existing third party debt instruments for the next five years and thereafter are as follows as of December 31, 2014 (in millions):


		2015		2016		2017		2018		2019		Thereafter		Total
	MAPCO Revolver	$	—	$	—	$	—	$	—	$	76	$	—	$	76

	Wells Term Loan	23.3		40.9		—		—		—		—		64.2

	DKL Revolver	—		—		—		—		251.8		—		251.8

	Reliant Bank Revolver	—		17		—		—		—		—		17

	Promissory Notes	11		11		11.1		1.1		1.2		40.6		76

	Lion Term Loan Facility, net of $0.3 million debt discount	21.9		21.9		21.9		38.5		—		—		104.2

	Capital Lease Obligations	0.1		0.1		0.1		0.1		0.1		—		0.5

	Total	$	56.3	$	90.9	$	33.1	$	39.7	$	329.1	$	40.6	$	589.7

Equity_Based_Compensation_Tabl

Equity Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Equity Based Compensation [Abstract]
Schedule of Equity based Payment Award, SARs and Options, Valuation Assumptions [Table Text Block]	The table below provides the assumptions used in estimating the fair values of our outstanding stock options and SARs under the Plan. For all awards granted, we calculated volatility using historical volatility and implied volatility of a peer group of public companies using weekly stock prices.


			2014 Grants			2013 Grants				2012 Grants			2011 Grants			2010 Grants
			(Graded Vesting)			(Graded Vesting)				(Graded Vesting)			(Graded Vesting)			(Graded Vesting)
			4 years			4 years				4 years			4 years			4 years
	Expected Volatility		50.15%-52.63%			53.36%-53.95%				55.35%-57.46%			58.58%-60.54%			33.01-60.88%

	Dividend Yield		2.54%-2.74%			1		%		1		%	1		%	1		%

	Expected Term		4.54-6.25 years			6.25 years				6.25 years			6.25 years			6.25 years

	Risk Free Rate		0.01%-2.96%			0.01%-2.96%				0.04%-2.04%			0.00%-3.37%			0.06%-3.33%

	Fair Value		$	10.67		$	15.75			$	9.28		$	6.59		$	3.51

Schedule of Equity based Compensation, Options and SARs Award Activity [Table Text Block]	The following table summarizes the stock option and SAR activity under the Plan for Delek for the years ended December 31, 2014, 2013 and 2012:



			Number of Options		Weighted-Average Exercise Price				Weighted-Average Contractual Term		Average Intrinsic Value
	Options outstanding, December 31, 2011		4,057,829		$	11.71

	Granted		1,140,300		$	19.01

	Exercised		(2,538,210	)	$	10.95

	Forfeited		(101,078	)	$	12.84

	Options and SARs outstanding, December 31, 2012		2,558,841		$	15.67

	Granted		867,400		$	33.23

	Exercised		(773,186	)	$	14.07

	Forfeited		(265,125	)	$	20.41

	Options and SARs outstanding, December 31, 2013		2,387,930		$	22.04

	Granted		1,006,100		$	30.18

	Exercised		(390,753	)	$	14.27

	Forfeited		(306,691	)	$	27.02

	Options and SARs outstanding, December 31, 2014		2,696,586		$	25.61			8.2		$	16.1

	Vested options and SARs exercisable, December 31, 2014		721,450		$	14.17			6.3		$	9.4

Schedule of Equity based Compensation, Restricted Stock Units Award Activity [Table Text Block]	The following table summarizes the RSU activity under the Plan for Delek for the years ended December 31, 2014, 2013 and 2012:



			Number of RSUs		Weighted-Average Grant Price
	Non-vested RSUs,	December 31, 2011	935,500		$	11.41

	Granted		156,000		$	23.94

	Vested		(279,045	)	$	11.65

	Non-vested RSUs,	December 31, 2012	812,455		$	13.73

	Granted		121,000		$	32.59

	Vested		(284,786	)	$	15.02

	Forfeited		(136,000	)	$	10.91

	Non-vested RSUs,	December 31, 2013	512,669		$	18.21

	Granted		145,452		$	32.41

	Vested		(241,122	)	$	18.17

	Non-vested RSUs,	December 31, 2014	416,999		$	23.19

Segment_Data_Tables

Segment Data (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Data [Abstract]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	The following is a summary of business segment operating performance as measured by contribution margin for the period indicated (in millions):


			As of and For the Year Ended December 31, 2014
	(In millions)		Refining			Retail			Logistics			Corporate,				Consolidated
												Other and Eliminations
	Net sales (excluding intercompany fees and sales)		$	5,728.40		$	1,869.30		$	726.7		$	(0.1	)		$	8,324.30

	Intercompany fees and sales		622.1			—			114.6			(736.7		)		—

	Operating costs and expenses:
	Cost of goods sold		5,664.80			1,671.50			697.2			(718.3		)		7,315.20

	Operating expenses		221.7			136.8			38.8			1.5				398.8

	Segment contribution margin		$	464		$	61		$	105.3		$	(20.0	)		610.3

	General and administrative expenses															133.4

	Depreciation and amortization															111.5

	Other operating income															(1.1		)
	Operating income															$	366.5

	Total assets		$	1,959.90		$	447.1		$	311.8		$	172.6			$	2,891.40

	Capital spending (excluding business combinations)		$	201.1		$	26.2		$	7.2		$	22.4			$	256.9




			As of and For the Year Ended December 31, 2013
	(In millions)		Refining			Retail			Logistics			Corporate,				Consolidated
												Other and Eliminations
	Net sales (excluding intercompany fees and sales)		$	6,005.10		$	1,871.40		$	829.8		$	0.5			$	8,706.80

	Intercompany fees and sales		430.7			—			77.6			(508.3		)		—

	Operating costs and expenses:
	Cost of goods sold		5,865.20			1,691.30			811.3			(487.1		)		7,880.70

	Operating expenses		223.1			132.5			35.6			(3.8		)		387.4

	Segment contribution margin		$	347.5		$	47.6		$	60.5		$	(16.9	)		438.7

	General and administrative expenses															111.2

	Depreciation and amortization															89.8

	Operating income															$	237.7

	Total assets		$	1,881.10		$	449		$	301.3		$	209			$	2,840.40

	Capital spending (excluding business combinations)		$	136.7		$	37.9		$	12.7		$	35			$	222.3




			As of and For the Year Ended December 31, 2012
	(In millions)		Refining			Retail			Logistics			Corporate,				Consolidated
												Other and Eliminations
	Net sales (excluding intercompany fees and sales)		$	6,070.80		$	1,877.80		$	775.9		$	2.2			$	8,726.70

	Intercompany fees and sales		170.1			—			42.6			(212.7		)		—

Operating costs and expenses:
Cost of goods sold		5,441.30			1,704.60			757.9			(195.6		)		7,708.20

Operating expenses		197.7			128			39.4			(1.8		)		363.3

Segment contribution margin		$	601.9		$	45.2		$	21.2		$	(13.1	)		655.2

General and administrative expenses															99.7

Depreciation and amortization															82.5

Other operating income, net															(0.1		)
Operating income															$	473.1

Total assets		$	1,811.20		$	425.6		$	307.9		$	79			$	2,623.70

Capital spending (excluding business combinations)		$	46.1		$	29.1		$	30.3		$	26.5			$	132

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Measurements [Abstract]
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	The fair value hierarchy for our financial assets and liabilities accounted for at fair value on a recurring basis at December 31, 2014, was (in millions):


		As of December 31, 2014
		Level 1		Level 2			Level 3		Total
	Assets
	OTC commodity swaps	$	—	$	389.6		$	—	$	389.6

	Interest rate derivatives	—		—			—		—

	Total assets	—		389.6			—		389.6

	Liabilities
	Interest rate derivatives	—		(0.9		)	—		(0.9		)

	OTC commodity swaps	—		(353.3		)	—		(353.3		)

	Total liabilities	—		(354.2		)	—		(354.2		)

	Net assets	$	—	$	35.4		$	—	$	35.4



		As of December 31, 2013
		Level 1		Level 2			Level 3		Total
	Assets
	OTC commodity swaps	$	—	$	23.9		$	—	$	23.9

	Interest rate derivatives	—		0.1			—		0.1

	Total assets	—		24			—		24

	Liabilities
	Interest rate derivatives	—		(2.8		)	—		(2.8		)

	OTC commodity swaps	—		(24.9		)	—		(24.9		)

	Total liabilities	—		(27.7		)	—		(27.7		)

	Net liabilities	$	—	$	(3.7	)	$	—	$	(3.7	)

Derivative_Instruments_Tables

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	The following table presents the fair value of our derivative instruments as of December 31, 2014 and 2013. The fair value amounts below are presented on a gross basis and do not reflect the netting of asset and liability positions permitted under our master netting arrangements, including cash collateral on deposit with our counterparties. We have elected to offset the recognized fair value amounts for multiple derivative instruments executed with the same counterparty in our financial statements. As a result, the asset and liability amounts below differ from the amounts presented in our consolidated balance sheets (in millions):


				As of December 31, 2014								As of December 31, 2013
	Derivative Type	Balance Sheet Location		Assets				Liabilities				Assets			Liabilities
	Derivatives not designated as hedging instruments:
	OTC commodity swaps(1)	Other current assets		$	190.3			$	(163.3	)		$	17.4		$	(8.6	)

	OTC commodity swaps(1)	Other current liabilities		20.1				(37.8		)		—			(3.4		)

	OTC commodity swaps(1)	Other long term assets		21.5				(14.3		)		—			—

	OTC commodity swaps(1)	Other long term liabilities		32.8				(2.7		)		—			—

	Interest rate derivatives	Other current assets		—				(0.6		)		—			—

	Interest rate derivatives	Other current liabilities		—				(0.3		)		—			—

	Interest rate derivatives	Other long term assets		—				—				0.1			—

	Interest rate derivatives	Other long term liabilities		—				—				—			(2.8		)


	Derivatives designated as hedging instruments:
	OTC commodity swaps(1)	Other current assets		97.1				(76.1		)		3.5			(3.2		)

	OTC commodity swaps(1)	Other current liabilities		9.4				(7.1		)		—			—

	OTC commodity swaps(1)	Other long term assets		—				—				—			—

	OTC commodity swaps(1)	Other long term liabilities		18.4				(52.0		)		3			(9.7		)

	Total gross fair value of derivatives			389.6				(354.2		)		24			(27.7		)

	Less: Counterparty netting and cash collateral(2)			333				(344.1		)		14.2			(16.8		)

	Less: Amounts subject to master netting arrangements that are not netted on the balance sheet			$	3.2			$	(3.2	)		$	6		$	(6.0	)

	Total net fair value of derivatives			$	53.4			$	(6.9	)		$	3.8		$	(4.9	)


	(1)	As of December 31, 2014 and 2013, we had open derivative contracts representing 11,169,150 and 7,703,000 barrels, respectively, of crude oil and refined petroleum products. Of these open contracts, contracts representing 4,512,400 and 5,186,000 barrels were designated as hedging instruments as of December 31, 2014 and 2013, respectively.

	(2)	As of December 31, 2014 and 2013, $11.1 million and $2.6 million, respectively, of cash collateral has been netted with the derivatives with each counterparty. Included in these amounts is $2.0 million of cash collateral associated with our interest rate derivatives as of both December 31, 2014 and 2013.
Derivatives Instruments, Gain(Loss) [Table Text Block]	ains (losses) associated with derivatives not designated as hedging instruments for the years ended December 31, 2014, 2013 and 2012 are as follows (in millions):


				Year Ended December 31,
	Derivative Type	Income Statement Location		2014				2013				2012
	OTC commodity swaps	Cost of goods sold		$	102.7			$	(1.2	)		$	3.3

	Interest rate derivatives	Interest expense		(0.4		)		(0.4		)		(2.6		)
		Total		$	102.3			$	(1.6	)		$	0.7

	Gains (losses) on our derivatives designated as cash flow hedging instruments or the years ended December 31, 2014, 2013 and 2012 are as follows (in millions):


			Year Ended December 31,
			2014				2013				2012
	OTC commodity swaps:
	Gain (loss) recognized in OCI (effective portion)		$	15			$	(5.6	)		$	(4.0	)

	Gain (loss) reclassified from accumulated OCI into cost of goods sold on closed positions (effective portion)		$	22.6			$	0.7			$	(1.1	)

	Gain (loss) recognized in cost of goods sold related to ineffectiveness		$	6.3			$	(2.5	)		$	(0.8	)

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	Significant components of Delek's deferred tax assets and liabilities, reported separately in the accompanying consolidated financial statements, as of December 31, 2014 and 2013 were as follows (in millions):


		December 31,
		2014			2013
	Current Deferred Taxes:
	Reserves and accruals	9.7			4.3

	Inventories	22.2			2.7

	ASC 815	(11.6		)	—

	Valuation allowance	(0.1		)	(0.1		)
	Total current deferred tax assets	20.2			6.9


	Non-Current Deferred Taxes:
	Property, plant and equipment, and intangibles	(251.6		)	(207.8		)
	Partnership investment	(16.3		)	(12.6		)
	Deferred revenues	(13.8		)	(14.8		)
	Compensation and employee benefits	7.1			4.9

	Net operating loss carryforwards	6.2			6

	Reserves and accruals	4.9			5.3

	Other	—			2.3

	Valuation allowance	(2.8		)	(3.3		)
	Total non-current deferred tax liabilities	(266.3		)	(220.0		)
	Total net deferred tax liabilities	$	(246.1	)	$	(213.1	)
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	The difference between the actual income tax expense and the tax expense computed by applying the statutory federal income tax rate to income from continuing operations was attributable to the following (in millions):



		Year Ended December 31,
		2014			2013			2012
	Provision for federal income taxes at statutory rate	$	114.7		$	72.3		$	149.7

	State income taxes, net of federal tax provision	6.7			2.6			11.4

	Non-controlling interest	(9.6		)	(6.4		)	(1.1		)
	Other items	(10.2		)	2.4			(8.4		)

	Income tax expense	$	101.6		$	70.9		$	151.6

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Income tax expense from continuing operations was as follows (in millions):


		Year Ended December 31,
		2014			2013			2012
	Current	$	64.2		$	32		$	135.8

	Deferred	37.4			38.9			15.8

		$	101.6		$	70.9		$	151.6

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

		2014			2013			2012
	Balance at the beginning of the year	$	0.3		$	0.6		$	0.7

	Additions based on tax positions related to current year	—			—			0.1

	Additions for tax positions related to prior years	2.6			—			—

	Reductions for tax positions related to the lapse of applicable statute of limitations	(0.2		)	(0.3		)	(0.2		)
	Balance at the end of the year	$	2.7		$	0.3		$	0.6

Commitments_and_Contingencies_1

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	The following is an estimate of our future minimum lease payments for operating leases having remaining noncancelable terms in excess of one year as of December 31, 2014 (in millions):



	2015	$	20.8

	2016	19.8

	2017	17.7

	2018	15.9

	2019	13.2

	Thereafter	64.6

	Total future minimum rentals	$	152

Selected_Quarterly_Financial_D1

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Schedule of Quarterly Financial Information [Table Text Block]	Quarterly financial information for the years ended December 31, 2014 and 2013 is summarized below. The quarterly financial information summarized below has been prepared by Delek's management and is unaudited (in millions, except per share data).



		For the Three Month Periods Ended
		March 31, 2014		June 30, 2014		September 30, 2014			December 31, 2014

	Net sales	$	1,865.70	$	2,374.70	$	2,322.20		$	1,761.70

	Operating income	$	67.7	$	106	$	120.9		$	71.9

	Net income	$	39.3	$	63.2	$	78.2		$	45.3

	Net income attributable to Delek	$	33.7	$	54.9	$	72.5		$	37.5

	Basic earnings per share	$	0.57	$	0.93	$	1.23		$	0.65

	Diluted earnings per share	$	0.56	$	0.92	$	1.22		$	0.64




		For the Three Month Periods Ended
		March 31, 2013		June 30, 2013		September 30, 2013			December 31, 2013


	Net sales	$	2,259.90	$	2,187.40	$	2,321.80		$	1,937.70

	Operating income	$	134.4	$	77.8	$	12.9		$	12.6

	Net income	$	82.1	$	51	$	3		$	(0.4	)

	Net income (loss) attributable to Delek	$	77.5	$	46.6	$	(1.7	)	$	(4.7	)

	Basic earnings (loss) per share	$	1.3	$	0.79	$	(0.03	)	$	(0.08	)

	Diluted earnings (loss) per share	$	1.28	$	0.78	$	(0.03	)	$	(0.08	)

Schedule_1_Condensed_Consolida

Schedule 1 Condensed Consolidating Financial Information (Tables)	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheets [Table Text Block]	With the exception of affiliate balances which are eliminated in consolidation, the Delek Logistics condensed consolidated balance sheets as of December 31, 2014 and 2013, as presented below, are included in the consolidated balance sheets of Delek.


			December 31,
			2014				2013
			(In millions)
	ASSETS
	Cash and cash equivalents		$	1.9			$	0.9

	Accounts receivable		28				29

	Inventory		10.3				17.5

	Other current assets		0.8				0.3

	Net property, plant and equipment		240.5				224.5

	Goodwill		11.7				11.7

	Intangible assets, net		11.3				12.4

	Other non-current assets		7.4				5

	Total assets		$	311.9			$	301.3

	LIABILITIES AND EQUITY
	Accounts payable		$	18.2			$	26

	Accounts payable to related parties		0.6				1.5

	Accrued expenses and other current liabilities		11.8				12.2

	Revolving credit facility		251.8				164.8

	Asset retirement obligations		3.3				3.1

	Deferred tax liabilities		0.2				0.3

	Other non-current liabilities		5.9				6.2

	Equity		20.1				87.2

	Total liabilities and equity		$	311.9			$	301.3

	Delek US Holdings, Inc.
	Parent Company Only
	Condensed Balance Sheets


			December 31,
			2014				2013
			(In millions, except share and per share data)
	ASSETS
	Current assets:
	Cash and cash equivalents		$	186.9			$	184.3

	Accounts receivable		0.9				0.8

	Interest receivable from subsidiaries		2.1				—

	Income tax receivable from subsidiaries		14				44.7

	Other current assets		70.9				16.5

Total current assets		274.8				246.3

Property, plant and equipment:
Property, plant and equipment		28.4				23.5

Less: accumulated depreciation		(9.6		)		(4.7		)
Property, plant and equipment, net		18.8				18.8

Notes receivable from related parties		74.4				72.7

Investment in subsidiaries		865.5				799.3

Deferred tax asset		—				0.2

Other non-current assets		2.3				0.5

Total assets		$	1,235.80			$	1,137.80

LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accounts payable		$	3.1			$	6.4

Accounts payable to subsidiaries		74.6				64.7

Current portion of long-term debt and capital lease obligations		—				18.3

Accrued expenses and other current liabilities		24.5				7.9

Total current liabilities		102.2				97.3

Non-current liabilities:
Long-term debt and capital lease obligations, net of current portion		17				—

Notes payable to subsidiaries		102				105.5

Deferred tax liabilities		7.3				—

Other non-current liabilities		5.6				—

Total non-current liabilities		131.9				105.5

Shareholders’ equity:
Preferred stock, $0.01 par value, 10,000,000 shares authorized, no shares issued and outstanding		—				—

Common stock, $0.01 par value, 110,000,000 shares authorized, 60,637,525 shares and 60,229,107 shares issued at December 31, 2014 and 2013, respectively		0.6				0.6

Additional paid-in capital		395.1				384.5

Accumulated other comprehensive loss		(12.6		)		(4.0		)
Treasury stock, 3,365,561 and 1,000,000 shares, at cost, as of December 31, 2014 and 2013, respectively.		(112.6		)		(37.9		)
Retained earnings		731.2				591.8

Total shareholders’ equity		1,001.70				935

Total liabilities and shareholders’ equity		$	1,235.80			$	1,137.80

Condensed Statements of Operations [Table Text Block]	Delek US Holdings, Inc.
	Parent Company Only
	Condensed Statements of Income


			Year Ended December 31,
			2014				2013				2012
			(In millions)
	Net sales		$	—			$	—			$	—

	Operating costs and expenses:
	Cost of goods sold		(81.1		)		8.8				(2.1		)

	General and administrative expenses		50.9				40.8				31.1

	Depreciation and amortization		4.9				3.4				0.9

	Total operating costs and expenses		(25.3		)		53				29.9

	Operating income (loss)		25.3				(53.0		)		(29.9		)

	Interest expense		0.6				1.8				5.1

	Interest income		(0.2		)		—				—

	Net interest expense from related parties		1.8				2.8				2.8

	Earnings from investment in subsidiaries		(181.1		)		(156.5		)		(289.6		)
	Total non-operating income, net		(178.9		)		(151.9		)		(281.7		)
	Income before income taxes		204.2				98.9				251.8

	Income tax expense (benefit)		5.6				(18.8		)		(21.0		)

	Net income		$	198.6			$	117.7			$	272.8

Condensed Statements of Comprehensive Income [Table Text Block]	Delek US Holdings, Inc.
	Parent Company Only
	Condensed Consolidated Statements of Comprehensive Income



			Year Ended December 31,
			2014				2013				2012
			(In millions)
	Net income attributable to Delek		$	198.6			$	117.7			$	272.8

	Other comprehensive income:
	Net loss on derivative instruments, net of tax benefit of $4.0, $2.9, and $0.7 for years ended December 31, 2014, 2013 and 2012, respectively, and net of ineffectiveness of $6.3, $(2.5) and $(0.8) for the years ended December 31, 2014, 2013 and 2012, respectively.		(8.3		)		(4.4		)		(1.4		)
	Foreign currency translation		$	(0.3	)		$	—			$	—

	Comprehensive income		$	190			$	113.3			$	271.4

Condensed Statements of Cash Flows [Table Text Block]	Delek US Holdings, Inc.
	Parent Company Only
	Condensed Statements of Cash Flows


			Year Ended December 31,
			2014				2013				2012
			(In millions)
	Cash flows from operating activities:
	Net income		$	198.6			$	117.7			$	272.8

	Adjustments to reconcile net income to net cash provided by operating activities:
	Depreciation and amortization		4.9				3.4				0.9

	Amortization of deferred financing costs		0.4				0.4				0.3

	Deferred income taxes		12.8				12.1				4.9

	Equity-based compensation expense		7.3				6.5				3.8

	Income tax benefit of equity-based compensation		(0.8		)		(4.7		)		(8.2		)
	Income from subsidiaries		(181.1		)		(156.5		)		(289.6		)
	Changes in assets and liabilities, net of acquisitions:
	Accounts receivable, net		(0.1		)		(0.8		)		0.5

	Inventories and other current assets		5.6				(24.2		)		(17.3		)

	Market value of derivatives		(47.7		)		(5.3		)		0.5

	Receivables and payables from related parties		6.5				(8.6		)		16.6

	Accounts payable and other current liabilities		6				(6.7		)		12.3

	Non-current assets and liabilities, net		7.8				(6.4		)		(0.1		)

	Net cash provided by (used in) operating activities		20.2				(73.1		)		(2.6		)

	Cash flows from investing activities:
	Business combinations		—				(5.1		)		—

	Purchase of property, plant and equipment		(4.9		)		(8.0		)		(9.4		)
	Investment in subsidiaries		(24.3		)		(46.4		)		(23.5		)
	Dividends from subsidiaries		155.3				317.2				83.1

	Distributions from subsidiaries		—				—				50

	Net repayments of notes receivable from subsidiaries		(1.7		)		(27.7		)		—

	Net cash provided by investing activities		124.4				230				100.2

	Cash flows from financing activities:
	Proceeds from revolver		57				12				8.5

	Payments on revolver		(50.0		)		(6.0		)		(4.5		)
	Repayment of note payable to related party		(11.8		)		—				(66.5		)

	Proceeds from notes payable to subsidiaries		—				—				136

	Repayment of note payable to subsidiaries		—				(23.1		)		(21.0		)

	Repayments of other debt instruments		—				(29.1		)		(30.4		)

	Proceeds from exercise of stock options		1.1				7.4				6.7

Taxes paid due to the net settlement of equity-based compensation		(5.2		)		(5.0		)		(8.2		)
Income tax benefit of equity-based compensation		0.8				4.7				8.2

Repurchase of common stock		(74.7		)		(37.9		)		—

Dividends paid		(59.2		)		(57.3		)		(35.5		)
Deferred financing costs paid		—				—				(0.4		)

Net cash used in financing activities		(142.0		)		(134.3		)		(7.1		)
Net increase in cash and cash equivalents		2.6				22.6				90.5

Cash and cash equivalents at the beginning of the period		184.3				161.7				71.2

Cash and cash equivalents at the end of the period		$	186.9			$	184.3			$	161.7

Accounting_Policies_Reclassifi

Accounting Policies Reclassifications (Details) (Goodwill [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Goodwill [Member]
Prior Period Reclassification Adjustment	$1.20

Accounting_Policies_Segment_Re

Accounting Policies Segment Reporting (Details)	Dec. 31, 2014
Accounting Policies [Abstract]
Number of Stores	365

Accounting_Policies_Accounts_R

Accounting Policies Accounts Receivable (Details) (Largest customer [Member], Customer Concentration Risk [Member])	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts Receivable [Member]
Concentration Risk [Line Items]
Number of Customers more than 10%	0	0
Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Number of Customers more than 10%	0	0	0

Accounting_Policies_Inventory_

Accounting Policies Inventory (Details) (Inventory purchased [Member], Supplier Concentration Risk [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Inventory purchased [Member] \| Supplier Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	32.90%	25.00%	24.20%

Accounting_Policies_Property_p

Accounting Policies Property, plant and equipment (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	$0.10	$0.60	$0.90
Automobiles [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	3 years
Automobiles [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	5 years
Computer Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	3 years
Computer Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	10 years
Refinery turnaround costs [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	4 years
Refinery turnaround costs [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	5 years
Furniture and Fixtures [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	5 years
Furniture and Fixtures [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	15 years
Asset retirement obligation assets [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	15 years
Asset retirement obligation assets [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	50 years
Refinery machinery and equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	5 years
Refinery machinery and equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	40 years
Pipelines and terminals [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	15 years
Pipelines and terminals [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	40 years
Retail store equipment and site improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	7 years
Retail store equipment and site improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	30 years
Building and building improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	15 years
Building and building improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life (years)	40 years

Accounting_Policies_Other_inta

Accounting Policies Other intangibles (Details)	12 Months Ended
Accounting Policies Other intangibles (Details)	Dec. 31, 2014
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life (years)	11 years 6 months
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life (years)	3 years

Accounting_Policies_Capitalize

Accounting Policies Capitalized interest (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Interest Costs Capitalized	$1.50	$1	$0.30

Accounting_Policies_Asset_reti

Accounting Policies Asset retirement obligations (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	$8.50	$8.30
Liabilities identified	0.2	0.2
Liabilities settled	-0.1	-0.6
Accretion expense	0.6	0.6	0.8
Ending balance	$9.20	$8.50	$8.30

Accounting_Policies_Advertisti

Accounting Policies Advertisting Costs (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Advertising Expense	$3.60	$4	$3.40

Accounting_Policies_Earnings_P

Accounting Policies Earnings Per Share (Details)	12 Months Ended
Accounting Policies Earnings Per Share (Details)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Weighted average common shares outstanding	58,780,947	59,186,921	58,719,968
Dilutive effect of equity instruments (shares)	574,173	860,217	924,830
Weighted average common shares outstanding, assuming dilution	59,355,120	60,047,138	59,644,798
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,867,368	1,226,038	1,344,825

Delek_Logistics_Details

Delek Logistics (Details) (USD $)	12 Months Ended	1 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Jul. 31, 2013	Feb. 28, 2014
	Dec. 31, 2014	Jul. 31, 2013	bbl
Variable Interest Entity [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	59.90%
Ownership Interest in General Partner	95.80%
General Partner ownership interest in Delek Logistics	2.00%
Limited Partners' Capital Account, Units Outstanding	2,799,258
Other Ownership Interests, Units Outstanding	11,999,258
General Partners' Capital Account, Units Outstanding	494,197
Tyler Terminal and Tanks [Member]
Variable Interest Entity [Line Items]
Payments to Acquire Businesses, Gross		$94.80
El Dorado Terminal and Tanks [Member]
Variable Interest Entity [Line Items]
Payments to Acquire Businesses, Gross			$95.90
Aggregate Shell Capacity (barrels)			2,500,000
Number of Storage Tanks			158

Delek_Logistics_Balance_Sheet_

Delek Logistics Balance Sheet (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets [Abstract]
Cash and cash equivalents	$444.10	$400	$601.70	$225.90
Accounts receivable	197	250.5
Inventory	469.6	672.3
Other current assets	136.7	94.3
Net property, plant and equipment	1,448.80	1,273.20
Goodwill	73.9	73.9	72.7	69.7
Intangible assets, net	16.2	17.4
Other non-current assets	105.1	58.8
Total assets	2,891.40	2,840.40	2,623.70
Liabilities and Equity [Abstract]
Accounts payable	477	602
Accrued expenses and other current liabilities	122.9	113.4
Deferred tax liabilities	246.1	213.1
Other non-current liabilities	18.5	25.6
Total liabilities and stockholders' equity	2,891.40	2,840.40
Variable Interest Entity, Primary Beneficiary [Member]
Assets [Abstract]
Cash and cash equivalents	1.9	0.9
Accounts receivable	28	29
Inventory	10.3	17.5
Other current assets	0.8	0.3
Net property, plant and equipment	240.5	224.5
Goodwill	11.7	11.7
Intangible assets, net	11.3	12.4
Other non-current assets	7.4	5
Total assets	311.9	301.3
Liabilities and Equity [Abstract]
Accounts payable	18.2	26
Accounts payable to related parties	0.6	1.5
Accrued expenses and other current liabilities	11.8	12.2
Revolving credit facility	251.8	164.8
Asset retirement obligations	3.3	3.1
Deferred tax liabilities	0.2	0.3
Other non-current liabilities	5.9	6.2
Equity	20.1	87.2
Total liabilities and stockholders' equity	$311.90	$301.30

Acquisitions_Details

Acquisitions (Details) (USD $)	0 Months Ended			12 Months Ended	0 Months Ended
In Millions, unless otherwise specified	Dec. 17, 2014	Oct. 01, 2014	Jan. 02, 2014	Dec. 31, 2014	Dec. 31, 2013	Oct. 24, 2013	Jul. 19, 2013	Jan. 10, 2013	Dec. 31, 2012	Dec. 31, 2011
	Dec. 17, 2014	bbl	Jan. 02, 2014	gal	Dec. 31, 2013	Oct. 24, 2013	Jul. 19, 2013	Jan. 10, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Goodwill (all is expected to be deductible for tax purposes)				73.9	$73.90				$72.70	$69.70
Frank Thompson Transport [Member]
Business Acquisition [Line Items]
Number of trucks acquired	120
Number of trailers acquired	200
Payments to Acquire Businesses, Gross	11.6
Property, plant, and equipment acquired	11.1
Working capital acquired	0.5
Mount Pleasant Terminal [Member]
Business Acquisition [Line Items]
Storage capacity (barrels)		200,000
Greenville Terminal [Member]
Business Acquisition [Line Items]
Storage capacity (barrels)		325,000
Greenville-Mt. Pleasant Assets [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		11.1
Inventory acquired		1.1
Property, plant, and equipment acquired		10
Crossett Facility [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross			11.1
Yearly Production Capacity (gallons)				10,000,000
Inventory acquired			0.1
Property, plant, and equipment acquired			11
Helena [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross					5
Property, plant, and equipment acquired					1
Intangible assets					4
Total					5
North Little Rock [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross						7.2
Inventory acquired						2.2
Hopewell [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross							5.7
Property, plant, and equipment acquired							3.5
Goodwill (all is expected to be deductible for tax purposes)							1.2
Total							5.7
Intangible assets							1
Beacon Facility [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross								$5.30

Inventory_Carrying_Value_Detai

Inventory Carrying Value (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventory [Line Items]
Total inventories	$469.60	$672.30
Refining [Member]
Inventory [Line Items]
Refinery raw materials and supplies	158.8	250.9
Refinery work in process	26.5	58.6
Finished goods	235.1	299.2
Retail [Member]
Inventory [Line Items]
Retail Merchandise	28	26.9
Finished goods	10.9	19.2
Logistics [Member]
Inventory [Line Items]
Finished goods	$10.30	$17.50

Inventory_Narrative_Details

Inventory Narrative (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Inventory Write-down	$50.10
Excess of Replacement or Current Costs over Stated LIFO Value	0.3	51.5
Cost of goods sold [Member]
Effect of LIFO Inventory Liquidation on Income	6.4	0.3	1.1
LIFO inventory [Member]
Inventory Write-down	$35.40

Crude_Oil_Supply_and_Inventory1

Crude Oil Supply and Inventory Purchase Agreement (Details) (USD $)	0 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Dec. 23, 2013	Dec. 31, 2014	Dec. 31, 2013
	Dec. 23, 2013	bbl	Dec. 31, 2013
Crude Oil Supply and Inventory Purchase Agreement [Abstract]
Maximum Barrels Per Day Supplied under Supply and Offtake Agreement (bpd)	100,000
Purchase Settlement Receivable (Payable)		($4.90)	$18.20
Inventory financing expense		10.5	10
Inventory consigned to J Aron (barrels)		3,200,000
Liability for inventory consigned to J Aron		$200.90

Property_Plant_and_Equipment_D

Property, Plant and Equipment (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$1,958.40		$1,678.40
Less: accumulated depreciation	-509.6		-405.2
Property, plant and equipment, net	1,448.80		1,273.20
Depreciation expense	110.2		85.5
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	94.9		86.1
Building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	266		255
Refinery machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	771.4		641.4
Pipelines and terminals [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	266.2		204.6
Retail store equipment and site improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	187.4		158.3
Refinery turnaround costs [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	112		55.1
Other equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	77.8		58.4
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	182.7		219.5
Refining [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,098.10	[1]	893.3	[1]
Less: accumulated depreciation	-252.9	[1]	-192.7	[1]
Property, plant and equipment, net	845.2	[1]	700.6	[1]
Depreciation expense	63.5	[1]	44.3	[1]
Logistics [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	293.5	[1]	264.1	[1]
Less: accumulated depreciation	-53	[1]	-39.6	[1]
Property, plant and equipment, net	240.5	[1]	224.5	[1]
Depreciation expense	13.6	[1]	12.6	[1]
Retail [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	511.9		477.6
Less: accumulated depreciation	-194.5		-168.4
Property, plant and equipment, net	317.4		309.2
Depreciation expense	28.5		25.2
Corporate, other and eliminations [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	54.9		43.4
Less: accumulated depreciation	-9.2		-4.5
Property, plant and equipment, net	45.7		38.9
Depreciation expense	$4.60		$3.40

[1]	In conjunction with the El Dorado Acquisition, we have reclassified certain operating segments. The certain assets previously operated by our refining segment were contributed to Delek Logistics.

Goodwill_Details

Goodwill (Details) (USD $)	12 Months Ended
Goodwill (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill accumulated impairment losses	$20,400,000
Goodwill impairment	0	0
Goodwill [Roll Forward]
Goodwill, beginning balance	73,900,000	72,700,000	69,700,000
Acquisitions		1,200,000	3,000,000
Goodwill, ending balance	73,900,000	73,900,000	72,700,000
Retail [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance		62,200,000	62,200,000
Acquisitions		0	0
Goodwill, ending balance	62,200,000	62,200,000	62,200,000
Logistics [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance		10,500,000	7,500,000
Acquisitions		1,200,000	3,000,000
Goodwill, ending balance	$11,700,000	$11,700,000	$10,500,000

Other_Intangible_Assets_Detail

Other Intangible Assets (Details) (USD $)	12 Months Ended		3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2012
Other Intangible Assets [Line Items]
Intangible Assets, Gross	$35.60	$35.50
Accumulated Amortization	-19.4	-18.1
Intangible assets, net	16.2	17.4
Amortization expense for 2015	1.3
Amortization expense for 2016	1.3
Amortization expense for 2017	1.3
Amortization expense for 2018	0.2
Rights-of-Way [Member]
Other Intangible Assets [Line Items]
Indefinite-lived intangible assets	12.1	12
Supply contracts [Member]
Other Intangible Assets [Line Items]
Estimated useful life (years)	11 years 6 months	11 years 6 months
Intangible Assets, Gross	12.2	12.2
Accumulated Amortization	-8.9	-7.9
Intangible assets, net	3.3	4.3
Trademarks [Member]
Other Intangible Assets [Line Items]
Estimated useful life (years)	4 years	4 years
Intangible Assets, Gross	0.7	0.7
Accumulated Amortization	-0.7	-0.7
Intangible assets, net	0	0
Noncompete Agreements [Member]
Other Intangible Assets [Line Items]
Intangible Assets, Gross	1.3	1.3
Accumulated Amortization	-1.3	-1.3
Intangible assets, net	0	0
Capacity contract [Member]
Other Intangible Assets [Line Items]
Estimated useful life (years)	8 years	8 years
Intangible Assets, Gross	9.3	9.3
Accumulated Amortization	-8.5	-8.2
Intangible assets, net	0.8	1.1
Minimum [Member]
Other Intangible Assets [Line Items]
Estimated useful life (years)	3 years
Minimum [Member] \| Noncompete Agreements [Member]
Other Intangible Assets [Line Items]
Estimated useful life (years)	3 years	3 years
Maximum [Member]
Other Intangible Assets [Line Items]
Estimated useful life (years)	11 years 6 months
Maximum [Member] \| Noncompete Agreements [Member]
Other Intangible Assets [Line Items]
Estimated useful life (years)	10 years		10 years
Depreciation and amortization [Member]
Other Intangible Assets [Line Items]
Amortization of Intangible Assets	$1.30	$4.30		$4.20

LongTerm_Obligations_and_Notes2

Long-Term Obligations and Notes Payable Table (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$589.70	$410.30
Capital Lease Obligations	0.5	0.6
Current portion of long-term debt, notes payable and capital lease obligations	56.4	33.7
Long-term Debt and Capital Lease Obligations	533.3	376.6
MAPCO Revolver [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	76
Reliant Bank Revolver [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	17
Promissory Notes [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	76	77.4
Term loan facility [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	104.2
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	0.5
Revolving Credit Facility [Member] \| Line of Credit [Member] \| MAPCO Revolver [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	76	67.5
Revolving Credit Facility [Member] \| Line of Credit [Member] \| DKL Revolver [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	251.8	164.8
Revolving Credit Facility [Member] \| Line of Credit [Member] \| Reliant Bank Revolver [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	17	10
Term loan facility [Member] \| Secured Debt [Member] \| Wells ABL [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	64.2	0
Term loan facility [Member] \| Secured Debt [Member] \| Lion Term Loan [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	104.2	90
Debt discount on Lion Term Loan Facility	$0.30

LongTerm_Obligations_and_Notes3

Long-Term Obligations and Notes Payable Debt Maturity Schedule (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
2015	$56.30
2016	90.9
2017	33.1
2018	39.7
2019	329.1
Thereafter	40.6
Debt and Capital Lease Obligations	589.7	410.3
MAPCO Revolver [Member]
Debt Instrument [Line Items]
2015	0
2016	0
2017	0
2018	0
2019	76
Thereafter	0
Debt and Capital Lease Obligations	76
Wells Term Loan [Member]
Debt Instrument [Line Items]
2015	23.3
2016	40.9
2017	0
2018	0
2019	0
Thereafter	0
Debt and Capital Lease Obligations	64.2
Reliant Bank Revolver [Member]
Debt Instrument [Line Items]
2015	0
2016	17
2017	0
2018	0
2019	0
Thereafter	0
Debt and Capital Lease Obligations	17
Promissory Notes [Member]
Debt Instrument [Line Items]
2015	11
2016	11
2017	11.1
2018	1.1
2019	1.2
Thereafter	40.6
Debt and Capital Lease Obligations	76	77.4
Term loan facility [Member]
Debt Instrument [Line Items]
2015	21.9
2016	21.9
2017	21.9
2018	38.5
2019	0
Thereafter	0
Debt and Capital Lease Obligations	104.2
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
2015	0.1
2016	0.1
2017	0.1
2018	0.1
2019	0.1
Thereafter	0
Debt and Capital Lease Obligations	0.5
Revolving Credit Facility [Member] \| Line of Credit [Member] \| MAPCO Revolver [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	76	67.5
Revolving Credit Facility [Member] \| Line of Credit [Member] \| DKL Revolver [Member]
Debt Instrument [Line Items]
2015	0
2016	0
2017	0
2018	0
2019	251.8
Thereafter	0
Debt and Capital Lease Obligations	251.8	164.8
Revolving Credit Facility [Member] \| Line of Credit [Member] \| Reliant Bank Revolver [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$17	$10

LongTerm_Obligations_and_Notes4

Long-Term Obligations and Notes Payable Lines of Credit Narrative (Details) (USD $)	12 Months Ended	0 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	6-May-14	Dec. 31, 2013	Jun. 26, 2014
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$589.70		$410.30
MAPCO Revolver [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	76
Wells Term Loan [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	64.2
Reliant Bank Revolver [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	17
Revolving Credit Facility [Member] \| Wells ABL [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	600
Delayed single draw term loan	70
Maximum Borrowing Capacity under Accordion Feature	875
Debt Instrument, Periodic Payment, Principal	5.8
Revolving Credit Facility [Member] \| Line of Credit [Member] \| MAPCO Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		160
Maximum Borrowing Capacity under Accordion Feature		50
Related Party Limiited Guaranty of Debt		50
Debt and Capital Lease Obligations	76		67.5
Debt, Weighted Average Interest Rate	3.60%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.35%
Line of Credit Facility, Remaining Borrowing Capacity		81.4
Revolving Credit Facility [Member] \| Line of Credit [Member] \| Wells ABL [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.90%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.38%
Line of Credit Facility, Remaining Borrowing Capacity	186.3
Revolving Credit Facility [Member] \| Line of Credit [Member] \| DKL Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	700
Maximum Borrowing Capacity under Accordion Feature	800
Related Party Limiited Guaranty of Debt	102
Debt and Capital Lease Obligations	251.8		164.8
Debt, Weighted Average Interest Rate	2.30%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.30%
Line of Credit Facility, Remaining Borrowing Capacity	440.8
Revolving Credit Facility [Member] \| Line of Credit [Member] \| Reliant Bank Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				17
Debt and Capital Lease Obligations	17		10
Debt Instrument, Interest Rate, Stated Percentage	5.25%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.50%
Line of Credit Facility, Remaining Borrowing Capacity	0
Term loan facility [Member] \| Secured Debt [Member] \| Wells ABL [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	64.2		0
Revolving Credit Facility, Swing Line Loan [Member] \| Wells ABL [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	55
Revolving Credit Facility, Swing Line Loan [Member] \| Line of Credit [Member] \| MAPCO Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		10
Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	102.7
Letter of Credit [Member] \| Wells ABL [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	550
Letter of Credit [Member] \| Line of Credit [Member] \| MAPCO Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		40
Letters of Credit Outstanding, Amount		2.6
Letter of Credit [Member] \| Line of Credit [Member] \| Wells ABL [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	90.5
Letter of Credit [Member] \| Line of Credit [Member] \| DKL Revolver [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	$7.50
Base Rate [Member] \| Revolving Credit Facility [Member] \| Line of Credit [Member] \| MAPCO Revolver [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		base rate
Base Rate [Member] \| Revolving Credit Facility [Member] \| Line of Credit [Member] \| DKL Revolver [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis	U.S. base rate
London Interbank Offered Rate (LIBOR) [Member] \| Revolving Credit Facility [Member] \| Line of Credit [Member] \| MAPCO Revolver [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		LIBOR
London Interbank Offered Rate (LIBOR) [Member] \| Revolving Credit Facility [Member] \| Line of Credit [Member] \| DKL Revolver [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis	LIBOR
Canada, Dollars \| Prime Rate [Member] \| Line of Credit [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis	Canadian prime rate
Canada, Dollars \| Canadian Dealer Offered Rate (CDOR) [Member] \| Line of Credit [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis	CDOR

LongTerm_Obligations_and_Notes5

Long-Term Obligations and Notes Payable Promissory Notes Narrative (Details) (USD $)	0 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2011	Dec. 31, 2014	Dec. 31, 2013	Apr. 28, 2011	Dec. 19, 2011
Debt Instrument [Line Items]
Debt and Capital Lease Obligations		$589.70	$410.30
Promissory Notes [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations		76	77.4
Ergon Note [Member] \| Notes Payable, Other Payables [Member] \| Promissory Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				50
Debt and Capital Lease Obligations		30
Debt Instrument, Periodic Payment, Principal	10
Debt Instrument, Interest Rate, Stated Percentage				4.00%
Build to Suit Notes [Member] \| Notes Payable, Other Payables [Member] \| Promissory Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum		5.00%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum		6.40%
Debt and Capital Lease Obligations		46
Ergon Paline Note [Member] \| Notes Payable, Other Payables [Member] \| Promissory Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					25
Debt and Capital Lease Obligations		0
Minimum [Member] \| Build to Suit Notes [Member] \| Notes Payable, Other Payables [Member] \| Promissory Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		1
Maximum [Member] \| Build to Suit Notes [Member] \| Notes Payable, Other Payables [Member] \| Promissory Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$2.20

LongTerm_Obligations_and_Notes6

Long-Term Obligations and Notes Payable Lion Term Loan Narrative (Details) (Term loan facility [Member], Secured Debt [Member], Lion Term Loan [Member], USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Jun. 23, 2014
Debt Instrument [Line Items]
Debt Instrument, Face Amount		110,000,000
Line of Credit Facility, Amount Outstanding	104,500,000
Debt Instrument, Periodic Payment, Principal	5,500,000
Debt, Weighted Average Interest Rate	5.50%
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		LIBOR
Reference Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		base rate
Interest Rate Floor [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		interest rate floor
Debt Instrument, Basis Spread on Variable Rate		5.50%
Fifth Third Bank [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		20,000,000

LongTerm_Obligations_and_Notes7

Long-Term Obligations and Notes Payable Restricted Net Assets (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified	Dec. 31, 2014
Long-Term Obligations and Notes Payable [Abstract]
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries	$941.80

LongTerm_Obligations_and_Notes8

Long-Term Obligations and Notes Payable Interest Rate Derivative Instruments Narrative (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Derivative, Notional Amount	$205
Interest Rate Derivative Liabilities, at Fair Value	0.9	2.7
Derivative, Gain (Loss) on Derivative, Net	102.3	-1.6	0.7
Derivatives not designated as hedging instruments [Member] \| Interest Expense [Member] \| Interest Rate Contract [Member]
Debt Instrument [Line Items]
Derivative, Gain (Loss) on Derivative, Net	($0.40)	($0.40)	($2.60)

Equity_Based_Compensation_Narr

Equity Based Compensation Narrative (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Delek US 2006 Long-Term Incentive Plan [Member]
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	5,053,392
Unrecognized compensation cost	$25.50
Unrecognized compensation cost, period for recognition (years)	2 years 4 months 0 days
Delek Logistics 2012 Long-Term Incentive Plan [Member]
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	612,207
Unrecognized compensation cost	4.4
Unrecognized compensation cost, period for recognition (years)	2 years 8 months 12 days
General and Administrative Expense [Member]
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	11.9	9.3	6.1
Allocated Share-based Compensation Expense, Net of Tax	7.7	6	4
General and Administrative Expense [Member] \| Delek US 2006 Long-Term Incentive Plan [Member]
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	1.6	4.2
General and Administrative Expense [Member] \| Delek Logistics 2012 Long-Term Incentive Plan [Member]
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense, Net of Tax	$1	$2.70

Equity_Based_Compensation_Opti

Equity Based Compensation Option and SAR Assumptions (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
2014 Grants Graded Vesting [Member]
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum	50.15%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum	52.63%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum	0.01%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum	2.96%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$10.67
2014 Grants Graded Vesting [Member] \| Minimum [Member]
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	2.54%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	4 years 6 months 15 days
2014 Grants Graded Vesting [Member] \| Maximum [Member]
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	2.74%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years 3 months 0 days
2013 Grants Graded Vesting [Member]
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum	53.36%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum	53.95%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years 3 months 0 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum	0.01%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum	2.96%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$15.75
2012 Grants Graded Vesting [Member]
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum	55.35%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum	57.46%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years 3 months 0 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum	0.04%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum	2.04%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$9.28
2011 Grants Graded Vesting [Member]
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum	58.58%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum	60.54%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years 3 months 0 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum	3.37%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$6.59
2010 Grants Graded Vesting [Member]
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum	33.01%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum	60.88%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years 3 months 0 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum	0.06%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum	3.33%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$3.51

Equity_Based_Compensation_Stoc

Equity Based Compensation Stock Option and SAR Activity (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options and SARs outstanding, beginning of year (shares)	2,387,930	2,558,841	4,057,829
Granted (shares)	1,006,100	867,400	1,140,300
Exercised (shares)	-390,753	-773,186	-2,538,210
Forfeited (shares)	-306,691	-265,125	-101,078
Options and SARs outstanding, end of year (shares)	2,696,586	2,387,930	2,558,841
Vested options and SARS exercisable, December 31, 2014 (shares)	721,450
Equity-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options and SARs Outstanding, weighted-average exercise price, Beginning of year (usd per share)	$22.04	$15.67	$11.71
Granted, weighted-average exercise price (usd per share)	$30.18	$33.23	$19.01
Exercised, weighted-average exercise price (usd per share)	$14.27	$14.07	$10.95
Forfeited,weighted-average exercise price (usd per share)	$27.02	$20.41	$12.84
Options and SARs Outstanding, weighted-average exercise price, End of year (usd per share)	$25.61	$22.04	$15.67
Vested options and SARS exercisable, December 31, 2014, weighted-average exercise price (usd per share)	$14.17
Options and SARs outstanding, December 31, 2014, weighted-average contractual term (usd per share)	8 years 2 months 12 days
Vested options and SARs exercisable, December 31, 2014, weighted-average contractual term (year)	6 years 3 months 18 days
Options and SARs outstanding, December 31, 2014, average intrinsic value (year)	$16.10
Vested options and SARs exercisable, December 31, 2014, average intrinsic value (usd per share)	$9.40

Equity_Based_Compensation_Rest

Equity Based Compensation Restricted Stock Units (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested RSUs, beginning of year (shares)	512,669	812,455	935,500
Granted (shares)	145,452	121,000	156,000
Vested (shares)	-241,122	-284,786	-279,045
Forfeited (shares)		-136,000
Non-vested RSUs, end of year (shares)	416,999	512,669	812,455
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested RSUs, weighted-average grant price, Beginning of year (usd per share)	$18.21	$13.73	$11.41
Granted, weighted-average grant price (usd per share)	$32.41	$32.59	$23.94
Vested, weighted-average grant price (usd per share)	$18.17	$15.02	$11.65
Forfeited, weighted-average grant price (usd per share)		$10.91
Non-vested RSUs, weighted-average grant price, End of year (usd per share)	$23.19	$18.21	$13.73
Chief Executive Officer [Member] \| Performance Shares [Member]
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	0.72%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	2 years 6 months 22 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	40.26%
Equity-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (shares)	49,836
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Vested, weighted-average grant price (usd per share)	$36.84

Equity_Based_Compensation_Comp

Equity Based Compensation Compensation Expense Related to Equity-based Awards (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income tax benefit of equity-based compensation expense	$1.80	$5.90	$9.20
Income tax benefit of equity-based compensation	-1.8	-5.9	-9.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	13.9	10.9	27.8
Stock Issued During Period, Shares, Share-based Compensation, Gross	408,418	609,743	1,583,121
Shares Paid for Tax Withholding for Share Based Compensation	223,457	448,229	1,234,134
Payments Related to Tax Withholding for Share-based Compensation	5.2	2.5	8.2
General and Administrative Expense [Member]
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	11.9	9.3	6.1
Allocated Share-based Compensation Expense, Net of Tax	$7.70	$6	$4

Equity_Based_Compensation_Gran

Equity Based Compensation Granting of GP Interest (Details) (Executive Officer [Member], GP membership interests [Member], USD $)	0 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Dec. 10, 2013	Mar. 10, 2013	Dec. 31, 2014	Dec. 31, 2013
Executive Officer [Member] \| GP membership interests [Member]
Equity-based Compensation Arrangement by Share-based Payment Award [Line Items]
Membership Interest in GP Granted to Employees	4.00%	1.40%
GP membership interest vesting percentage on June 10, 2014			0.50%
Membership Interest in GP Semi-Annual Vesting Percentage			0.25%
Allocated Share-based Compensation Expense			$0.40	$1.50
Allocated Share-based Compensation Expense, Net of Tax			0.3	1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options			$0.50
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 5 months 0 days

Segment_Data_Details

Segment Data (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	bbl	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Combined Capacity of Tyler and El Dorado Refineries (bpd)									140,000
Capacity of Tyler Refinery									60,000
Capacity of El Dorado Refinery									80,000
Number of Stores	365								365
Net sales (excluding intercompany fees and sales)	$1,761.70	$2,322.20	$2,374.70	$1,865.70	$1,937.70	$2,321.80	$2,187.40	$2,259.90	$8,324.30	$8,706.80	$8,726.70
Intercompany fees and sales									0	0	0
Operating Costs and Expenses [Abstract]
Cost of goods sold									7,315.20	7,880.70	7,708.20
Operating expenses									398.8	387.4	363.3
Segment Contribution Margin									610.3	438.7	655.2
General and administrative expenses									133.4	111.2	99.7
Depreciation and amortization									111.5	89.8	82.5
Other operating income, net									-1.1	0	-0.1
Operating income	71.9	120.9	106	67.7	12.6	12.9	77.8	134.4	366.5	237.7	473.1
Total assets	2,891.40				2,840.40				2,891.40	2,840.40	2,623.70
Capital spending (excluding business combinations)									256.9	222.3	132
Refining [Member]
Segment Reporting Information [Line Items]
Net sales (excluding intercompany fees and sales)									5,728.40	6,005.10	6,070.80
Intercompany fees and sales									622.1	430.7	170.1
Operating Costs and Expenses [Abstract]
Cost of goods sold									5,664.80	5,865.20	5,441.30
Operating expenses									221.7	223.1	197.7
Segment Contribution Margin									464	347.5	601.9
Total assets	1,959.90				1,881.10				1,959.90	1,881.10	1,811.20
Capital spending (excluding business combinations)									201.1	136.7	46.1
Retail [Member]
Segment Reporting Information [Line Items]
Number of Stores	365								365
Number of Stores, Dealer Locations	46								46
Net sales (excluding intercompany fees and sales)									1,869.30	1,871.40	1,877.80
Intercompany fees and sales									0	0	0
Operating Costs and Expenses [Abstract]
Cost of goods sold									1,671.50	1,691.30	1,704.60
Operating expenses									136.8	132.5	128
Segment Contribution Margin									61	47.6	45.2
Total assets	447.1				449				447.1	449	425.6
Capital spending (excluding business combinations)									26.2	37.9	29.1
Logistics [Member]
Segment Reporting Information [Line Items]
Net sales (excluding intercompany fees and sales)									726.7	829.8	775.9
Intercompany fees and sales									114.6	77.6	42.6
Operating Costs and Expenses [Abstract]
Cost of goods sold									697.2	811.3	757.9
Operating expenses									38.8	35.6	39.4
Segment Contribution Margin									105.3	60.5	21.2
Total assets	311.8				301.3				311.8	301.3	307.9
Capital spending (excluding business combinations)									7.2	12.7	30.3
Corporate, other and eliminations [Member]
Segment Reporting Information [Line Items]
Net sales (excluding intercompany fees and sales)									-0.1	0.5	2.2
Intercompany fees and sales									-736.7	-508.3	-212.7
Operating Costs and Expenses [Abstract]
Cost of goods sold									-718.3	-487.1	-195.6
Operating expenses									1.5	-3.8	-1.8
Segment Contribution Margin									-20	-16.9	-13.1
Total assets	172.6				209				172.6	209	79
Capital spending (excluding business combinations)									22.4	35	26.5
TENNESSEE \| Retail [Member]
Segment Reporting Information [Line Items]
Number of Stores	197								197
ALABAMA \| Retail [Member]
Segment Reporting Information [Line Items]
Number of Stores	90								90
GEORGIA \| Retail [Member]
Segment Reporting Information [Line Items]
Number of Stores	48								48
ARKANSAS \| Retail [Member]
Segment Reporting Information [Line Items]
Number of Stores	13								13
VIRGINIA \| Retail [Member]
Segment Reporting Information [Line Items]
Number of Stores	8								8
Kentucky and Mississippi [Member] \| Retail [Member]
Segment Reporting Information [Line Items]
Number of Stores	9								9
Refining Marketing Services [Member] \| Logistics [Member]
Segment Reporting Information [Line Items]
Intercompany fees and sales									14.4	13.6
Crude Transportation and Storage Fees [Member] \| Logistics [Member]
Segment Reporting Information [Line Items]
Intercompany fees and sales									$94.60	$57.80

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral	$11.10	$2.60
Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral	2	2
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net fair value of derivative assets	389.6	24
Derivative Liability	-354.2	-27.7
Net assets (liabilities)	35.4	-3.7
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net fair value of derivative assets	0	0
Derivative Liability	0	0
Net assets (liabilities)	0	0
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net fair value of derivative assets	389.6	24
Derivative Liability	-354.2	-27.7
Net assets (liabilities)	35.4	-3.7
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net fair value of derivative assets	0	0
Derivative Liability	0	0
Net assets (liabilities)	0	0
Fair Value, Measurements, Recurring [Member] \| OTC commodity swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net fair value of derivative assets	389.6	23.9
Derivative Liability	-353.3	-24.9
Fair Value, Measurements, Recurring [Member] \| OTC commodity swaps [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net fair value of derivative assets	0	0
Derivative Liability	0	0
Fair Value, Measurements, Recurring [Member] \| OTC commodity swaps [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net fair value of derivative assets	389.6	23.9
Derivative Liability	-353.3	-24.9
Fair Value, Measurements, Recurring [Member] \| OTC commodity swaps [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net fair value of derivative assets	0	0
Derivative Liability	0	0
Fair Value, Measurements, Recurring [Member] \| Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net fair value of derivative assets	0	0.1
Derivative Liability	-0.9	-2.8
Fair Value, Measurements, Recurring [Member] \| Interest Rate Contract [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net fair value of derivative assets	0	0
Derivative Liability	0	0
Fair Value, Measurements, Recurring [Member] \| Interest Rate Contract [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net fair value of derivative assets	0	0.1
Derivative Liability	-0.9	-2.8
Fair Value, Measurements, Recurring [Member] \| Interest Rate Contract [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net fair value of derivative assets	0	0
Derivative Liability	$0	$0

Derivative_Assets_and_Liabilit

Derivative Assets and Liabilities (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Assets	$389.60		$24
Liabilities	-354.2		-27.7
Counterparty netting and cash collateral, Assets	333	[1]	14.2
Counterparty netting and cash collateral, Liabilities	-344.1	[1]	-16.8	[1]
Derivative Asset, Subject to Master Netting Arrangement	3.2		6
Derivative Liability, Subject to Master Netting Arrangement	-3.2		-6
Total net fair value of derivative assets	53.4		3.8
Total net fair value of derivative liabilities	-6.9		-4.9
Cash collateral	11.1		2.6
Derivatives not designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative open contract (barrels)	11,169,150		7,703,000
Derivatives designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative open contract (barrels)	4,512,400		5,186,000
OTC commodity swaps [Member] \| Derivatives not designated as hedging instruments [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Assets	20.1	[2]	0	[2]
Liabilities	-37.8	[2]	-3.4	[2]
OTC commodity swaps [Member] \| Derivatives not designated as hedging instruments [Member] \| Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Assets	21.5	[2]	0
Liabilities	-14.3	[2]	0
OTC commodity swaps [Member] \| Derivatives not designated as hedging instruments [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Assets	32.8	[2]	0	[2]
Liabilities	-2.7	[2]	0	[2]
OTC commodity swaps [Member] \| Derivatives not designated as hedging instruments [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Assets	190.3	[2]	17.4	[2]
Liabilities	-163.3	[2]	-8.6	[2]
OTC commodity swaps [Member] \| Derivatives designated as hedging instruments [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Assets	9.4	[2]	0	[2]
Liabilities	-7.1	[2]	0	[2]
OTC commodity swaps [Member] \| Derivatives designated as hedging instruments [Member] \| Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Assets	0	[2]	0	[2]
Liabilities	0	[2]	0	[2]
OTC commodity swaps [Member] \| Derivatives designated as hedging instruments [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Assets	18.4	[2]	3	[2]
Liabilities	-52	[2]	-9.7	[2]
OTC commodity swaps [Member] \| Derivatives designated as hedging instruments [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Assets	97.1	[2]	3.5	[2]
Liabilities	-76.1	[2]	-3.2	[2]
Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Cash collateral	2		2
Interest Rate Contract [Member] \| Derivatives not designated as hedging instruments [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Assets	0		0
Liabilities	-0.3		0
Interest Rate Contract [Member] \| Derivatives not designated as hedging instruments [Member] \| Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Assets	0		0.1
Liabilities	0		0
Interest Rate Contract [Member] \| Derivatives not designated as hedging instruments [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Assets	0		0
Liabilities	0		-2.8
Interest Rate Contract [Member] \| Derivatives not designated as hedging instruments [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Assets	0		0
Liabilities	($0.60)		$0

[1]	(2)B As of DecemberB 31, 2014 and 2013, $11.1 million and $2.6 million, respectively, of cash collateral has been netted with the derivatives with each counterparty. Included in these amounts is $2.0 million of cash collateral associated with our interest rate derivatives as of both DecemberB 31, 2014 and 2013.
[2]	As of DecemberB 31, 2014 and 2013, we had open derivative contracts representing 11,169,150 and 7,703,000 barrels, respectively, of crude oil and refined petroleum products. Of these open contracts, contracts representing 4,512,400 and 5,186,000 barrels were designated as hedging instruments as of DecemberB 31, 2014 and 2013, respectively.

Derivative_Instruments_Derivat

Derivative Instruments, Derivatives Gains and Losses (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$102.30	($1.60)	$0.70
Gain (loss) recognized in cost of goods sold related to ineffectiveness	6.3	-2.5	-0.8
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net	0	0	0
Accumulated Other Comprehensive Loss, Cumulative Changes in Net Loss from Cash Flow Hedges, Effect Net of Tax	12.3
Cash flow hedge gain to be reclassified within twelve months	9
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	0	0	0
Cost of goods sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified from accumulated OCI into cost of goods sold on closed positions (effective portion)	14.7	0.4	-0.7
OTC commodity swaps [Member] \| Cost of goods sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	131.6	-3	1.4
Derivatives designated as hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in OCI (effective portion)	15	-5.6	-4
Gain (loss) reclassified from accumulated OCI into cost of goods sold on closed positions (effective portion)	22.6	0.7	-1.1
Gain (loss) recognized in cost of goods sold related to ineffectiveness	6.3	-2.5	-0.8
Derivatives not designated as hedging instruments [Member] \| OTC commodity swaps [Member] \| Cost of goods sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	102.7	-1.2	3.3
Derivatives not designated as hedging instruments [Member] \| Interest Rate Contract [Member] \| Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	($0.40)	($0.40)	($2.60)

Income_Taxes_Narrative_Details

Income Taxes Narrative (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Valuation Allowance, Deferred Tax Asset, Change in Amount	$0.50	$2
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	170.5
Operating Loss Carryforwards, Valuation Allowance	26.8
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	0.8
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	2.6	0	0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0.2	0.3	0.2
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	2.2	0.3
Unrecognized Tax Benefits, Interest on Income Taxes Expense	$0.20

Income_Taxes_Components_of_Def

Income Taxes Components of Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Deferred Taxes [Abstract]
Reserves and accruals	$9.70	$4.30
Inventories	22.2	2.7
ASC 815	-11.6	0
Valuation allowance	-0.1	-0.1
Total current deferred tax assets	20.2	6.9
Non-Current Deferred Taxes [Abstract]
Property, plant and equipment, and intangibles	-251.6	-207.8
Partnership investment	-16.3	-12.6
Deferred revenues	-13.8	-14.8
Compensation and employee benefits	7.1	4.9
Net operating loss carryforwards	6.2	6
Reserves and accruals	4.9	5.3
Other	0	2.3
Valuation allowance	-2.8	-3.3
Total non-current deferred tax liabilities	-266.3	-220
Total net deferred tax liabilities	($246.10)	($213.10)

Income_Taxes_Income_Taxes_Reco

Income Taxes Income Taxes, Reconciliation of Income Tax Expense (Benefit) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Provision for federal income taxes at statutory rate	$114.70	$72.30	$149.70
State income taxes, net of federal tax provision	6.7	2.6	11.4
Non-controlling interest	-9.6	-6.4	-1.1
Other items	-10.2	2.4	-8.4
Income tax expense	$101.60	$70.90	$151.60

Income_Taxes_Income_taxes_comp

Income Taxes Income taxes, components of income tax (benefit) expense (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income taxes, components of income tax (benefit) expense [Abstract]
Current	$64.20	$32	$135.80
Deferred	37.4	38.9	15.8
Income tax expense	$101.60	$70.90	$151.60

Income_Taxes_Income_Taxes_Unre

Income Taxes Income Taxes - Unrecognized Tax Benefits (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Beginning of Period	$0.30	$0.60	$0.70
Net increase from current period tax positions	0	0	0.1
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	2.6	0	0
Decreases related to lapse of the applicable statute of limitations	-0.2	-0.3	-0.2
Unrecognized Tax Benefits, End of Period	$2.70	$0.30	$0.60

Commitments_and_Contingencies_2

Commitments and Contingencies (Details) (USD $)	Dec. 31, 2014
Loss Contingencies [Line Items]
Self insurance Workers' Comp Coverage Ceiling per accident	$1,000,000
Self Insurance General Liability Claims Coverage Ceiling per occurence	4,000,000
Self Insurance Auto Liabiity Coverage Ceiling per accident	4,000,000
Accrual for Environmental Loss Contingencies	9,400,000
Recorded Third-Party Environmental Recoveries Receivable	500,000
Recorded Third-Party Environmental Recoveries, Current	100,000
Recorded Third-Party Environmental Recoveries, Noncurrent	400,000
Accrued Environmental Loss Contingencies, Current	900,000
Letter of Credit [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount	102,700,000
Line of Credit Facility, Amount Outstanding	$0

Commitments_and_Contingencies_3

Commitments and Contingencies Operating Leases (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Leases [Abstract]
Operating Leases, Rent Expense	$24.70	$19	$17.10
2015	20.8
2016	19.8
2017	17.7
2018	15.9
2019	13.2
Thereafter	64.6
Total future minimum rentals	$152

Employees_Workforce_Details

Employees Workforce (Details)	Dec. 31, 2014
Tyler Refinery [Member] \| Operations and Maintenance Employees [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of Employees Represented by Union	161
Tyler Refinery [Member] \| Truck Drivers [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of Employees Represented by Union	40
El Dorado Refinery [Member] \| Operations and Maintenance Employees [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of Employees Represented by Union	167

Employees_401k_Plan_Details

Employees 401(k) Plan (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
401(k) Plan [Abstract]
Employer Matching Contribution, Percent	6.00%
401(k) expense	$4.20	$3.90	$3.40

Related_Party_Transactions_Det

Related Party Transactions (Details)	0 Months Ended
Related Party Transactions (Details)	20-May-14	Mar. 20, 2013	Feb. 17, 2015
Related Party Transaction [Line Items]
Number of Shares Sold by Majority Shareholder	10,580,000	9,000,000
Purchase of common stock (shares)		1,000,000
Subsequent Event [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners			5.20%

Selected_Quarterly_Financial_D2

Selected Quarterly Financial Data (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Selected Quarterly Financial Information [Abstract]
Net sales	$1,761.70	$2,322.20	$2,374.70	$1,865.70	$1,937.70	$2,321.80	$2,187.40	$2,259.90	$8,324.30	$8,706.80	$8,726.70
Operating income	71.9	120.9	106	67.7	12.6	12.9	77.8	134.4	366.5	237.7	473.1
Net income	45.3	78.2	63.2	39.3	-0.4	3	51	82.1	226	135.7	276
Net income (loss) attributable to Delek	$37.50	$72.50	$54.90	$33.70	($4.70)	($1.70)	$46.60	$77.50	$198.60	$117.70	$272.80
Basic earnings (loss) per share	$0.65	$1.23	$0.93	$0.57	($0.08)	($0.03)	$0.79	$1.30	$3.38	$1.99	$4.65
Diluted earnings (loss) per share	$0.64	$1.22	$0.92	$0.56	($0.08)	($0.03)	$0.78	$1.28	$3.35	$1.96	$4.57

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	12 Months Ended			0 Months Ended	2 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 23, 2015	Feb. 26, 2015
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared	$1	$0.95	$0.60
Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared				$0.15
Stock Repurchase Program, Authorized Amount					$125

Schedule_1_Condensed_Balance_S

Schedule 1 Condensed Balance Sheet (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Preferred Stock, Par or Stated Value Per Share	$0.01	$0.01
Cash and cash equivalents	$444.10	$400	$601.70	$225.90
Accounts receivable	197	250.5
Other current assets	136.7	94.3
Total current assets	1,247.40	1,417.10
Property, plant and equipment	1,958.40	1,678.40
Less: accumulated depreciation	-509.6	-405.2
Property, plant and equipment, net	1,448.80	1,273.20
Deferred tax asset	20.2	6.9
Other non-current assets	105.1	58.8
Total assets	2,891.40	2,840.40	2,623.70
Accounts payable	477	602
Current portion of long-term debt and capital lease obligations	56.4	33.7
Accrued expenses and other current liabilities	122.9	113.4
Total current liabilities	857.2	1,080.10
Long-term debt and capital lease obligations, net of current portion	533.3	376.6
Deferred tax liabilities	266.3	220
Other non-current liabilities	18.5	25.6
Total non-current liabilities	835.8	639.9
Preferred stock, $0.01 par value, 10,000,000 shares authorized, no shares issued and outstanding	0	0
Accumulated other comprehensive loss	-12.6	-4
Treasury stock, 3,365,561 and 1,000,000 shares, at cost, as of December 31, 2014 and 2013, respectively.	-112.6	-37.9
Retained earnings	731.2	591.8
Total stockholders' equity	1,198.40	1,120.40	1,078	653.6
Total liabilities and shareholdersb equity	2,891.40	2,840.40
Parent Company [Member]
Preferred Stock, Par or Stated Value Per Share	$0.01	$0.01
Cash and cash equivalents	186.9	184.3	161.7	71.2
Accounts receivable	0.9	0.8
Interest receivable from subsidiaries	2.1	0
Income tax receivable	14	44.7
Other current assets	70.9	16.5
Total current assets	274.8	246.3
Property, plant and equipment	28.4	23.5
Less: accumulated depreciation	-9.6	-4.7
Property, plant and equipment, net	18.8	18.8
Notes receivable from related parties	74.4	72.7
Investment in subsidiaries	865.5	799.3
Deferred tax asset	0	0.2
Other non-current assets	2.3	0.5
Total assets	1,235.80	1,137.80
Accounts payable	3.1	6.4
Accounts payable to subsidiaries	74.6	64.7
Current portion of long-term debt and capital lease obligations	0	18.3
Accrued expenses and other current liabilities	24.5	7.9
Total current liabilities	102.2	97.3
Long-term debt and capital lease obligations, net of current portion	17	0
Note payable to subsidiaries	102	105.5
Deferred tax liabilities	7.3	0
Other non-current liabilities	5.6	0
Total non-current liabilities	131.9	105.5
Preferred stock, $0.01 par value, 10,000,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $0.01 par value, 110,000,000 shares authorized, 60,637,525 shares and 60,229,107 shares issued at December 31, 2014 and 2013, respectively	0.6	0.6
Additional paid-in capital	395.1	384.5
Accumulated other comprehensive loss	-12.6	-4
Treasury stock, 3,365,561 and 1,000,000 shares, at cost, as of December 31, 2014 and 2013, respectively.	-112.6	-37.9
Retained earnings	731.2	591.8
Total stockholders' equity	1,001.70	935
Total liabilities and shareholdersb equity	$1,235.80	$1,137.80

Schedule_1_Condensed_Balance_S1

Schedule 1 Condensed Balance Sheets Parenthetical (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Preferred Stock, Par or Stated Value Per Share	$0.01	$0.01
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$0.01	$0.01
Common Stock, Shares Authorized	110,000,000	110,000,000
Common Stock, Shares, Issued	60,637,525	60,229,107
Treasury Stock, Shares	3,365,561	1,000,000
Parent Company [Member]
Preferred Stock, Par or Stated Value Per Share	$0.01	$0.01
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$0.01	$0.01
Common Stock, Shares Authorized	110,000,000	110,000,000
Common Stock, Shares, Issued	60,637,525	60,229,107
Treasury Stock, Shares	3,365,561	1,000,000

Schedule_1_Condensed_Statement

Schedule 1 Condensed Statements of Income (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales	$1,761.70	$2,322.20	$2,374.70	$1,865.70	$1,937.70	$2,321.80	$2,187.40	$2,259.90	$8,324.30	$8,706.80	$8,726.70
Cost of goods sold									7,315.20	7,880.70	7,708.20
Total operating costs and expenses									7,957.80	8,469.10	8,253.60
Operating income (loss)	71.9	120.9	106	67.7	12.6	12.9	77.8	134.4	366.5	237.7	473.1
Interest expense									40.6	37.7	45.7
Interest income									-0.8	-0.3	-0.2
Total non-operating income, net									-38.9	-31.1	-45.5
Income before income taxes									327.6	206.6	427.6
Income tax expense (benefit)									101.6	70.9	151.6
Net income	37.5	72.5	54.9	33.7	-4.7	-1.7	46.6	77.5	198.6	117.7	272.8
Parent Company [Member]
Net sales									0	0	0
Cost of goods sold									-81.1	8.8	-2.1
General and administrative expenses									50.9	40.8	31.1
Depreciation and amortization									4.9	3.4	0.9
Total operating costs and expenses									-25.3	53	29.9
Operating income (loss)									25.3	-53	-29.9
Interest expense									0.6	1.8	5.1
Interest income									-0.2	0	0
Net interest expense from related parties									1.8	2.8	2.8
Earnings from investment in subsidiaries									-181.1	-156.5	-289.6
Total non-operating income, net									-178.9	-151.9	-281.7
Income before income taxes									204.2	98.9	251.8
Income tax expense (benefit)									5.6	-18.8	-21
Net income									$198.60	$117.70	$272.80

Schedule_1_Condensed_Statement1

Schedule 1 Condensed Statements of Comprehensive Income (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income									$0.80	$0.30	$0.20
Net income (loss) attributable to Delek	37.5	72.5	54.9	33.7	-4.7	-1.7	46.6	77.5	198.6	117.7	272.8
Net loss on derivative instruments, net of tax benefit of $4.0, $2.9, and $0.7 for years ended December 31, 2014, 2013 and 2012, respectively, and net of ineffectiveness of $6.3, $(2.5) and $(0.8) for the years ended December 31, 2014, 2013 and 2012, respectively.									-8.3	-4.4	-1.4
Foreign currency translation									-0.3	0	0
Comprehensive income									190	113.3	271.4
Parent Company [Member]
Interest income									0.2	0	0
Net income (loss) attributable to Delek									198.6	117.7	272.8
Net loss on derivative instruments, net of tax benefit of $4.0, $2.9, and $0.7 for years ended December 31, 2014, 2013 and 2012, respectively, and net of ineffectiveness of $6.3, $(2.5) and $(0.8) for the years ended December 31, 2014, 2013 and 2012, respectively.									-8.3	-4.4	-1.4
Foreign currency translation									-0.3	0	0
Comprehensive income									$190	$113.30	$271.40

Schedule_1_Condensed_Statement2

Schedule 1 Condensed Statements of Comprehensive Income Parenthetical (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income tax benefit on net loss on derivative instruments	$4	$2.90	$0.70
Ineffectiveness gain (loss) on cash flow hedges	6.3	-2.5	-0.8
Parent Company [Member]
Income tax benefit on net loss on derivative instruments	4	2.9	0.7
Ineffectiveness gain (loss) on cash flow hedges	$6.30	($2.50)	($0.80)

Schedule_1_Condensed_Statement3

Schedule 1 Condensed Statements of Cash Flows (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$198.60	$117.70	$272.80
Amortization of deferred financing costs	4.6	6.5	4.7
Deferred income taxes	38.8	44.8	25.2
Equity-based compensation expense	13.9	15	6.2
Income tax benefit of equity-based compensation	-1.8	-5.9	-9.2
Accounts receivable, net	-55.4	-5.8	-20.5
Inventories and other current assets	-217	252.6	-43.5
Market value of derivatives	59.9	8.8	-1.1
Accounts payable and other current liabilities	-117.3	50.3	39.3
Non-current assets and liabilities, net	38	23.5	13.5
Net cash provided by (used in) operating activities	316.9	102.5	462.9
Business combinations	-33.8	-23.2	-23.3
Purchase of non-controlling interest in subsidiaries	0	0	-4.1
Purchases of property, plant and equipment	-256.9	-222.3	-132
Net cash provided by investing activities	-289.4	-244.2	-159.2
Repayment of note payable to related party	0	0	-66.5
Proceeds from exercise of stock options	1.1	1.1	6.7
Taxes paid due to the net settlement of equity-based compensation	-5.2	-2.5	-8.2
Income tax benefit of equity-based compensation	1.8	5.9	9.2
Repurchase of common stock	-74.7	-37.9	0
Dividends paid	-59.2	-57.3	-35.5
Deferred financing costs paid	-9.8	-4.2	-5.2
Net cash used in financing activities	16.6	-60	72.1
Net increase in cash and cash equivalents	44.1	-201.7	375.8
Cash and cash equivalents at the end of the period	444.1	400	601.7
Parent Company [Member]
Net income	198.6	117.7	272.8
Depreciation and amortization	4.9	3.4	0.9
Amortization of deferred financing costs	0.4	0.4	0.3
Deferred income taxes	12.8	12.1	4.9
Equity-based compensation expense	7.3	6.5	3.8
Income tax benefit of equity-based compensation	-0.8	-4.7	-8.2
Income from subsidiaries	-181.1	-156.5	-289.6
Accounts receivable, net	-0.1	-0.8	0.5
Inventories and other current assets	5.6	-24.2	-17.3
Market value of derivatives	-47.7	-5.3	0.5
Receivables and payables from related parties	6.5	-8.6	16.6
Accounts payable and other current liabilities	6	-6.7	12.3
Non-current assets and liabilities, net	7.8	-6.4	-0.1
Net cash provided by (used in) operating activities	20.2	-73.1	-2.6
Business combinations	0	-5.1	0
Purchases of property, plant and equipment	-4.9	-8	-9.4
Investment in subsidiaries	-24.3	-46.4	-23.5
Dividends from subsidiaries	155.3	317.2	83.1
Distributions from subsidiaries	0	0	50
Net repayments of notes receivable from subsidiaries	-1.7	-27.7	0
Net cash provided by investing activities	124.4	230	100.2
Proceeds from revolver	57	12	8.5
Payments on revolver	-50	-6	-4.5
Repayment of note payable to related party	-11.8	0	-66.5
Proceeds from notes payable to subsidiaries	0	0	136
Repayment of note payable to subsidiaries	0	-23.1	-21
Repayments of other debt instruments	0	-29.1	-30.4
Proceeds from exercise of stock options	1.1	7.4	6.7
Taxes paid due to the net settlement of equity-based compensation	-5.2	-5	-8.2
Income tax benefit of equity-based compensation	0.8	4.7	8.2
Repurchase of common stock	-74.7	-37.9	0
Dividends paid	-59.2	-57.3	-35.5
Deferred financing costs paid	0	0	-0.4
Net cash used in financing activities	-142	-134.3	-7.1
Net increase in cash and cash equivalents	2.6	22.6	90.5
Cash and cash equivalents at the end of the period	$186.90	$184.30	$161.70