Acquisitions - Allocation of the Aggregate Purchase Price (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2018	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill		$ 857.8	$ 816.6	$ 12.2		$ 12.2
Estimated amortization expense for 2019		5.9
Estimated amortization expense for 2020		5.9
Estimated amortization expense for 2021		5.9
Estimated amortization expense for 2022		5.5
Estimated amortization expense for 2023		5.1
Goodwill		66.3	804.4	0.0
Operating Segments | Refining
Business Acquisition [Line Items]
Goodwill		801.3	750.9	0.0		0.0
Goodwill		50.4	750.9	0.0
Operating Segments | Retail
Business Acquisition [Line Items]
Goodwill		44.3	30.8	0.0		$ 0.0
Goodwill		44.3	$ 30.8	$ 0.0
Alon USA Energy, Inc.
Business Acquisition [Line Items]
Cash		215.3
Receivables		176.8
Inventories		266.3
Prepaids and other current assets		38.7
Property, plant and equipment	[1]	1,130.3
Equity method investments		31.0
Acquired intangible assets	[2]	86.7
Goodwill	[3]	870.7
Other non-current assets		37.0
Accounts payable		(263.4)
Obligation under Supply & Offtake Agreements		(208.9)
Current portion of environmental liabilities		(7.9)
Other current liabilities		(308.6)
Environmental liabilities and asset retirement obligations, net of current portion		(226.7)
Deferred income taxes		(194.0)
Debt		(568.0)
Other non-current liabilities	[4]	(95.6)
Fair value of net assets acquired		979.7
Resulting increase to goodwill		66.3
Goodwill, expected tax deductible amount		15.5
Above market lease		15.8
Rights-of-Way | Alon USA Energy, Inc.
Business Acquisition [Line Items]
Indefinite-lived intangible asset acquired		9.5
Liquor Licenses | Alon USA Energy, Inc.
Business Acquisition [Line Items]
Indefinite-lived intangible asset acquired		8.5
Colonial Pipeline | Alon USA Energy, Inc.
Business Acquisition [Line Items]
Indefinite-lived intangible asset acquired		1.7
Refinery Permits | Alon USA Energy, Inc.
Business Acquisition [Line Items]
Indefinite-lived intangible asset acquired		3.1
Fuel Supply Agreement | Alon USA Energy, Inc.
Business Acquisition [Line Items]
Fair value of finite-lived intangibles		$ 49.0
Acquired finite-lived intangible assets, weighted average useful life (in years)		10 years
Amortization expense of intangible assets		$ 4.9
Estimated amortization expense for 2019		4.9
Estimated amortization expense for 2020					$ 4.9
Estimated amortization expense for 2021					4.9
Estimated amortization expense for 2022					4.9
Estimated amortization expense for 2023					4.9
Trade Names | Alon USA Energy, Inc.
Business Acquisition [Line Items]
Fair value of finite-lived intangibles		$ 4.0
Acquired finite-lived intangible assets, weighted average useful life (in years)		5 years
Amortization expense of intangible assets		$ 0.8
Estimated amortization expense for 2019		0.8
Estimated amortization expense for 2021					0.8
Estimated amortization expense for 2022					0.8
Estimated amortization expense for 2023					$ 0.4
Licensing Agreements | Alon USA Energy, Inc.
Business Acquisition [Line Items]
Fair value of finite-lived intangibles		$ 2.6
Acquired finite-lived intangible assets, weighted average useful life (in years)		8 years 8 months 12 days
Amortization expense of intangible assets		$ 0.1
Below Market Lease | Alon USA Energy, Inc.
Business Acquisition [Line Items]
Fair value of finite-lived intangibles		$ 8.3

[1] This fair value of property, plant and equipment is based on a valuation using a combination of the income, cost and market approaches. The useful lives are based upon guidelines for similar equipment, chronological age since installation and consideration of costs spent on upgrades, repairs, turnarounds and rebuilds.

[2] The acquired intangible assets amount includes the following identified intangibles: • Third-party fuel supply agreement intangible that is subject to amortization with a fair value of $49.0 million, which is being amortized over a 10-year useful life. We recognized amortization expense for the year ended December 31, 2018 of $4.9 million. The estimated annual amortization is $4.9 million for the four succeeding fiscal years. • Fuel trade name intangible valued at $4.0 million, which will be amortized over 5 years. We recognized amortization expense for the year ended December 31, 2018 of $0.8 million. The estimated annual amortization is $0.8 million for the three succeeding fiscal years, with $0.4 million in the fourth succeeding year. • License agreements intangible valued at $2.6 million, which is being amortized over 8.7 years. We recognized amortization expense for the year ended December 31, 2018 of $0.1 million, as this intangible was sold in the first quarter of 2018. • Rights-of-way intangible valued at $9.5 million, which has an indefinite life. • Liquor license intangible valued at $8.5 million, which has an indefinite life. • Colonial Pipeline shipping rights intangible valued at $1.7 million, which has an indefinite life. • Refinery permits valued at $3.1 million, which have an indefinite life. • Below-market lease intangibles valued at $8.3 million, which is being amortized over the remaining lease term.

[3] Goodwill generated as a result of the Delek/Alon Merger consists of the value of expected synergies from combining operations, the acquisition of an existing integrated refining, marketing and retail business located in areas with access to cost–advantaged feedstocks with an assembled workforce that cannot be duplicated at the same costs by a new entrant, and the strategic advantages of having a larger market presence. The total amount of goodwill that is expected to be deductible for tax purposes is $15.5 million. Goodwill has been allocated to reportable segments based on various relevant factors. The updated allocation of goodwill to reportable segments in connection with the purchase price allocation is as follows: Refining - $801.3 million and Retail - $44.3 million. The remainder relates to the asphalt operations, which was included in the corporate, other and eliminations segment, and which was subsequently written off as part of the impairment on assets held for sale during the first quarter of 2018.

[4] The assumed other non-current liabilities include liabilities related to above-market leases fair valued at $15.8 million, which is being amortized over the remaining lease term.