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Revenues (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue		$ 3,788.0	$ 3,236.3	$ 10,861.2	$ 9,447.0
Trade accounts receivable		231.2		231.2		$ 225.2
Receivables related to contracts with customers
Disaggregation of Revenue [Line Items]
Trade accounts receivable		171.2		171.2		$ 145.6
Petroleum product sales (at retail)
Disaggregation of Revenue [Line Items]
Revenue		2,770.1	2,281.9	7,910.6	6,684.0
Petroleum product sales (at retail) | Difference between Revenue Guidance in Effect before and after Topic 606
Disaggregation of Revenue [Line Items]
Revenue	[1]	6.9		18.9
Petroleum product sales (at wholesale)
Disaggregation of Revenue [Line Items]
Revenue		381.4	299.0	1,072.2	866.9
Petroleum product sales (at wholesale) | Difference between Revenue Guidance in Effect before and after Topic 606
Disaggregation of Revenue [Line Items]
Revenue	[1]	44.8		124.9
Petroleum product sales
Disaggregation of Revenue [Line Items]
Revenue		3,151.5	2,580.9	8,982.8	7,550.9
Petroleum product sales | Difference between Revenue Guidance in Effect before and after Topic 606
Disaggregation of Revenue [Line Items]
Revenue	[1]	51.7		$ 143.8
Petroleum product sales, wholesale, bulk pipeline sales
Disaggregation of Revenue [Line Items]
Collection period				7 days
Petroleum product sales, rack sales
Disaggregation of Revenue [Line Items]
Collection period				10 days
RINs
Disaggregation of Revenue [Line Items]
Revenue		$ 11.6	$ 48.7	$ 67.3	$ 114.4
Collection period				5 days
Minimum | Petroleum product sales (at retail)
Disaggregation of Revenue [Line Items]
Collection period				2 days
Maximum | Petroleum product sales (at retail)
Disaggregation of Revenue [Line Items]
Collection period				7 days
[1] Three Months EndedSeptember 30, Nine Months EndedSeptember 30,(Millions of dollars, except per share amounts) 2018 2017 2018 2017(a) Includes excise taxes of: $464.1 $488.8 $1,364.8 $1,473.4

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