Acquisitions - Narrative (Details) $ / shares in Units, bpd in Thousands			3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($) store $ / shares	Jul. 01, 2017 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) store $ / shares	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) store $ / shares	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) bbl / pure store $ / shares	Dec. 31, 2017 USD ($) store $ / shares	Dec. 31, 2016 USD ($)	May 21, 2018	Feb. 12, 2018 asphalt_terminal	May 14, 2015
Business Acquisition [Line Items]
Common stock, par or stated value per share (USD per share) | $ / shares	$ 0.01	$ 0.01	$ 0.01				$ 0.01				$ 0.01	$ 0.01
Stock split, conversion ratio		1
Number of stores | store	302		279				302				279	302
Acquisition related transaction costs											$ 3,000,000.0
Net revenues			$ 2,474,100,000	$ 2,768,900,000	$ 2,636,900,000	$ 2,353,200,000	$ 2,483,700,000	$ 2,370,600,000	$ 1,230,700,000	$ 1,182,200,000	10,233,100,000	$ 7,267,100,000	$ 4,197,900,000
Adjustments to depreciation and amortization expense											38,100,000	21,200,000	10,200,000
Accretion expense											1,900,000	700,000
Interest expense											125,900,000	93,800,000	54,400,000
Income (loss) from continuing operations before income tax expense											485,500,000	299,300,000	(391,200,000)
Gain on remeasurement of equity method investment											0	(190,100,000)	0
Impairment of equity method investment											0	0	245,300,000
Equity method investments	$ 138,100,000		$ 130,300,000				$ 138,100,000				130,300,000	138,100,000
Gain on remeasurement of equity method investment								$ (190,100,000)			0	190,100,000	0
General and Administrative Expense
Business Acquisition [Line Items]
Acquisition related transaction costs											6,600,000	$ 24,700,000	3,000,000.0
Paramount-Nevada Asphalt Company, LLC
Business Acquisition [Line Items]
Equity method investment, ownership percentage														50.00%	50.00%
Alon USA Energy, Inc.
Business Acquisition [Line Items]
Equity method investment, ownership percentage	47.00%	47.00%					47.00%					47.00%				48.00%
Equity interest issued per acquiree share | shares		0.504
Impairment of equity method investment											$ 0	$ 0
Equity method investments									$ 252,600,000				259,000,000.0
Acquisition-date fair value of pre-existing non-controlling interest	$ 449,000,000.0	$ 449,000,000.0					$ 449,000,000.0					449,000,000.0
Alon USA Energy, Inc.
Business Acquisition [Line Items]
Common stock, par or stated value per share (USD per share) | $ / shares		$ 0.01
Alon USA Energy, Inc.
Business Acquisition [Line Items]
Business acquisition, share price (USD per share) | $ / shares		$ 25.96
Interest rate, stated percentage		3.00%
Principal amount of note convertible into common shares		$ 1,000
Ownership interest in general partner			100.00%								100.00%
Number of stores | store			300								300
Separately recognized transactions, net sales											$ 4,649,800,000	1,950,000,000.0
Separately recognized transactions, net income											$ 394,900,000	90,100,000
Alon USA Energy, Inc. | Parent Company's Equity Income Elimination Adjustment
Business Acquisition [Line Items]
Acquisition related transaction costs												(32,200,000)	(13,700,000)
Net revenues												(59,000,000.0)	(10,400,000)
Adjustments to depreciation and amortization expense												(34,700,000)	(70,800,000)
Accretion expense												800,000	1,600,000
Interest expense												(9,400,000)	(20,700,000)
Income (loss) from continuing operations before income tax expense												3,200,000	(42,200,000)
Gain on remeasurement of equity method investment												$ (190,100,000)
Impairment of equity method investment													$ 245,300,000
Alon USA Energy, Inc. | Tax Effect Adjustment
Business Acquisition [Line Items]
U.S. income tax statutory blended rate (percentage)												37.00%	35.00%
Alon USA Energy, Inc. | Alon USA Energy, Inc.
Business Acquisition [Line Items]
Gain on remeasuring equity method investment		196,400,000										$ 196,400,000
Loss on reversal of AOCI		6,300,000										6,300,000
Gain on remeasurement of equity method investment		$ 190,100,000										$ 190,100,000
Alon USA Energy, Inc. | Big Spring Refinery
Business Acquisition [Line Items]
Total throughput capacity											73
Alon USA Energy, Inc. | Krotz Spring Refinery
Business Acquisition [Line Items]
Total throughput capacity											74
Four Asphalt Terminals
Business Acquisition [Line Items]
Number of asphalt terminals | asphalt_terminal															4
Alon Partnership | Alon USA Energy, Inc.
Business Acquisition [Line Items]
Members or limited partners, ownership interest (percentage)	81.60%