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Revenues (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 11,264.3	$ 14,034.6	$ 14,362.9
Merchandise sales
Disaggregation of Revenue [Line Items]
Revenue	2,955.1	2,620.1	2,423.0
Operating Segment | Marketing
Disaggregation of Revenue [Line Items]
Revenue	11,264.0	14,034.3	14,362.3
Operating Segment | Marketing | Total petroleum product sales
Disaggregation of Revenue [Line Items]
Revenue	8,208.6	11,373.8	11,858.4
Operating Segment | Marketing | Petroleum product sales (at retail)
Disaggregation of Revenue [Line Items]
Revenue	7,444.6	10,184.0	10,459.2
Operating Segment | Marketing | Petroleum product sales (at wholesale)
Disaggregation of Revenue [Line Items]
Revenue	764.0	1,189.8	1,399.2
Operating Segment | Marketing | Merchandise sales
Disaggregation of Revenue [Line Items]
Revenue	2,955.1	2,620.1	2,423.0
Operating Segment | Marketing | RINs
Disaggregation of Revenue [Line Items]
Revenue	95.5	34.8	75.2
Operating Segment | Marketing | Other
Disaggregation of Revenue [Line Items]
Revenue	4.8	5.6	5.7
Corporate and Other Assets
Disaggregation of Revenue [Line Items]
Revenue	$ 0.3	$ 0.3	$ 0.6

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