Goodwill (Details) - USD ($)		12 Months Ended
	Jul. 01, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Impairment of goodwill		$ 0	$ 0	$ 0
Accumulated goodwill impairment		0
Goodwill [Roll Forward]
Goodwill, beginning balance		857,800,000	816,600,000	12,200,000
Acquisitions			66,300,000	804,400,000
Write-down resulting from asset held for sale impairment		(2,100,000)	(25,100,000)
Goodwill, ending balance		855,700,000	857,800,000	816,600,000
Operating Segments | Refining
Goodwill [Roll Forward]
Goodwill, beginning balance		801,300,000	750,900,000	0
Acquisitions	$ 801,300,000		50,400,000	750,900,000
Write-down resulting from asset held for sale impairment		0	0
Goodwill, ending balance		801,300,000	801,300,000	750,900,000
Operating Segments | Logistics
Goodwill [Roll Forward]
Goodwill, beginning balance		12,200,000	12,200,000	12,200,000
Acquisitions			0	0
Write-down resulting from asset held for sale impairment		0	0
Goodwill, ending balance		12,200,000	12,200,000	12,200,000
Operating Segments | Retail
Goodwill [Roll Forward]
Goodwill, beginning balance		44,300,000	30,800,000	0
Acquisitions	$ 44,300,000		13,500,000	30,800,000
Write-down resulting from asset held for sale impairment		(2,100,000)	0
Goodwill, ending balance		42,200,000	44,300,000	30,800,000
Corporate, Other and Eliminations
Goodwill [Roll Forward]
Goodwill, beginning balance		0	22,700,000	0
Acquisitions			2,400,000	22,700,000
Write-down resulting from asset held for sale impairment		0	(25,100,000)
Goodwill, ending balance		$ 0	$ 0	$ 22,700,000