Segment Data - Operating Performance (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2018		Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net revenues (excluding intercompany fees and sales)		$ 2,563.5		$ 1,230.7	$ 4,916.7		$ 2,412.8
Operating costs and expenses:
Cost of goods sold		2,176.8		1,157.8	4,219.6		2,193.5
Operating expenses		157.5		62.1	315.6		123.3
General and administrative expenses		52.9		27.5	118.1		54.0
Depreciation and amortization		49.2		29.5	97.2		58.5
Operating income (loss)		135.1		(46.5)	173.9		(16.8)
Total assets		6,211.8	[1]	2,876.5	6,211.8	[1]	2,876.5	$ 5,935.2
Capital spending (excluding business combinations)		54.7	[2]	15.0	124.8	[2]	30.2
Footnote [Abstract]
Assets of discontinued operations held for sale		25.2			25.2			$ 160.0
Other Operating Income (Expense), Net		8.0		(0.3)	7.7		(0.3)
Gain (Loss) on Disposition of Assets					(1.3)		(0.3)
Continuing Operations
Segment Reporting Information [Line Items]
Net revenues (excluding intercompany fees and sales)		2,563.5		1,230.7	4,916.7		2,412.8
Intercompany fees and sales		0.0		0.0	0.0		0.0
Operating costs and expenses:
Cost of goods sold		2,176.8		1,157.8	4,219.6		2,193.5
Operating expenses		157.5		62.1	315.6		123.3
Segment contribution margin		229.2		10.8	381.5		96.0
Logistics
Segment Reporting Information [Line Items]
Intercompany fees and sales		99.5			181.8
Operating Segments | Refining
Segment Reporting Information [Line Items]
Intercompany fees and sales				8.2			17.2
Operating costs and expenses:
Total assets		5,101.7	[1]	1,949.6	5,101.7	[1]	1,949.6
Capital spending (excluding business combinations)		33.7	[2]	11.2	85.2	[2]	22.0
Operating Segments | Refining | Continuing Operations
Segment Reporting Information [Line Items]
Net revenues (excluding intercompany fees and sales)		2,243.7		1,144.8	4,184.4		2,235.3
Intercompany fees and sales		226.1		8.2	411.3		17.2
Operating costs and expenses:
Cost of goods sold		2,179.6		1,084.5	4,057.5		2,065.3
Operating expenses		113.2		51.6	227.9		102.4
Segment contribution margin		177.0		16.9	310.3		84.8
Operating Segments | Logistics
Operating costs and expenses:
Total assets		650.3	[1]	415.5	650.3	[1]	415.5
Capital spending (excluding business combinations)		2.3	[2]	2.1	4.5	[2]	4.9
Operating Segments | Logistics | Continuing Operations
Segment Reporting Information [Line Items]
Net revenues (excluding intercompany fees and sales)		113.3		87.1	219.5		180.0
Intercompany fees and sales		53.0		39.6	114.7		76.2
Operating costs and expenses:
Cost of goods sold		106.0		85.0	225.0		177.6
Operating expenses		14.9		10.0	27.5		20.3
Segment contribution margin		45.4		31.7	81.7		58.3
Operating Segments | Retail
Operating costs and expenses:
Total assets	[1]	332.8			332.8
Capital spending (excluding business combinations)	[2]	2.1			4.1
Operating Segments | Retail | Continuing Operations
Segment Reporting Information [Line Items]
Net revenues (excluding intercompany fees and sales)		244.8			454.4
Intercompany fees and sales		0.0			0.0
Operating costs and expenses:
Cost of goods sold		200.9			374.1
Operating expenses		25.3			49.8
Segment contribution margin		18.6			30.5
Corporate, Other and Eliminations
Operating costs and expenses:
Total assets		127.0	[1]	511.4	127.0	[1]	511.4
Capital spending (excluding business combinations)		16.6	[2]	1.7	31.0	[2]	3.3
Corporate, Other and Eliminations | Continuing Operations
Segment Reporting Information [Line Items]
Net revenues (excluding intercompany fees and sales)		(38.3)		(1.2)	58.4		(2.5)
Intercompany fees and sales		(279.1)		(47.8)	(526.0)		(93.4)
Operating costs and expenses:
Cost of goods sold		(309.7)		(11.7)	(437.0)		(49.4)
Operating expenses		4.1		0.5	10.4		0.6
Segment contribution margin		(11.8)		$ (37.8)	(41.0)		$ (47.1)
Big Spring Logistic Assets
Footnote [Abstract]
Business Acquisition, Transaction Costs		$ 0.4			$ 0.4

[1] Assets held for sale of $25.2 million are included in the corporate, other and eliminations segment as of June 30, 2018.

[2] Capital spending excludes transaction costs capitalized in the amount of $0.4 million during the six months ended June 30, 2018, that relate to the Big Spring Logistic Assets Acquisition.