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Business Segment
3 Months Ended
Mar. 31, 2020
Segment Reporting [Abstract]  
Business Segment Business Segment
 
The Company's operations have one reportable segment which is Marketing.  The operations include the sale of retail motor fuel products and convenience merchandise along with the wholesale and bulk sale capabilities of our Product Supply and Wholesale ("PS&W") group. As the primary purpose of the PS&W group is to support our retail operations and provide fuel for their daily operation, the bulk and wholesale fuel sales are secondary to the support functions performed by these groups. As such, they are all treated as one segment for reporting purposes as they sell the same products. This Marketing segment contains essentially all of the revenue generating functions of the Company. Results not included in the reportable segment include Corporate and Other Assets. Net settlement proceeds from litigation are included in Corporate and other assets operating income. The reportable segment was determined based on information reviewed by the Chief Operating Decision Maker (CODM).
 
  Three Months Ended
  March 31, 2020March 31, 2019
 Total Assets atExternalIncomeExternalIncome
(Millions of dollars)March 31, 2020Revenues(Loss)Revenues(Loss)
Marketing$2,282.0  $3,184.7  $100.9  $3,116.3  $16.2  
Corporate and other assets301.4  0.1  (11.6) 0.1  (10.9) 
Total$2,583.4  $3,184.8  $89.3  $3,116.4  $5.3