Segment Data - Operating Performance (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net revenues	$ 2,283.7	$ 2,334.3	$ 2,480.3	$ 2,199.9	$ 2,474.1	$ 2,768.9	$ 2,636.9	$ 2,353.2	$ 9,298.2	$ 10,233.1	$ 7,267.1
Operating costs and expenses:
Cost of materials and other									7,657.2	8,560.5	6,327.6
Operating expenses (excluding depreciation and amortization presented below)									682.2	645.0	429.0
Segment contribution margin									958.8	1,027.6	510.5
Depreciation and amortization									194.3	199.4	153.3
General and administrative expenses									274.7	247.6	175.9
Other operating (income) expense, net									(2.5)	(31.3)	1.0
Operating income	48.2	$ 87.4	$ 134.3	$ 222.4	182.8	$ 255.2	$ 135.1	$ 38.8	492.3	611.9	180.3
Capital spending (excluding business combinations)									428.1	317.2	177.5
Refining
Segment Reporting Information [Line Items]
Net revenues									8,095.9	8,771.4	6,364.5
Logistics
Segment Reporting Information [Line Items]
Net revenues									323.0	416.8	382.3
Retail
Segment Reporting Information [Line Items]
Net revenues									838.0	915.4	426.7
Corporate, Other and Eliminations
Segment Reporting Information [Line Items]
Net revenues									41.3	129.5	93.6
Operating costs and expenses:
Cost of materials and other									(908.5)	(904.3)	(247.8)
Operating expenses (excluding depreciation and amortization presented below)									20.9	20.2	18.4
Segment contribution margin									(34.7)	(66.2)	(88.9)
Depreciation and amortization									22.1	15.1	15.2
Capital spending (excluding business combinations)									131.1	91.7	19.2
Operating Segments | Refining
Operating costs and expenses:
Cost of materials and other									7,544.5	8,279.9	5,852.2
Operating expenses (excluding depreciation and amortization presented below)									492.4	465.4	317.7
Segment contribution margin									761.6	865.1	450.7
Depreciation and amortization									134.3	133.7	109.2
Capital spending (excluding business combinations)									266.6	203.9	128.2
Operating Segments | Refining | BTC
Segment Reporting Information [Line Items]
Biodiesel tax credit	$ 77.6				$ 24.9				77.6	24.9
Operating Segments | Refining | BTC, Renewable Blending Activities
Operating costs and expenses:
Segment contribution margin										36.0
Operating Segments | Logistics
Operating costs and expenses:
Cost of materials and other									336.5	429.1	372.9
Operating expenses (excluding depreciation and amortization presented below)									74.1	58.7	43.3
Segment contribution margin									173.4	169.8	121.9
Depreciation and amortization									26.7	26.0	21.9
Capital spending (excluding business combinations)									9.9	11.6	18.4
Operating Segments | Retail
Operating costs and expenses:
Cost of materials and other									684.7	755.8	350.3
Operating expenses (excluding depreciation and amortization presented below)									94.8	100.7	49.6
Segment contribution margin									58.5	58.9	26.8
Depreciation and amortization									11.2	24.6	7.0
Capital spending (excluding business combinations)									20.5	10.0	11.7
Inter-segment fees and sales
Segment Reporting Information [Line Items]
Net revenues									(963.6)	(1,079.8)	(411.9)
Inter-segment fees and sales | Refining
Segment Reporting Information [Line Items]
Net revenues									(702.6)	(839.0)	(256.1)
Inter-segment fees and sales | Logistics
Segment Reporting Information [Line Items]
Net revenues									(261.0)	(240.8)	(155.8)
Inter-segment fees and sales | Retail
Segment Reporting Information [Line Items]
Net revenues									$ 0.0	$ 0.0	$ 0.0