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Business Segments
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Business Segments Business Segments
Our 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 group. As the primary purpose of the product supply and wholesale 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 played 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 activities of the Company. Results not included in the reportable segment include Corporate and Other Assets. The reportable segment was determined based on information reviewed by the Chief Operating Decision Maker.

Segment Information Corporate and Other Assets 
(Millions of dollars)MarketingConsolidated
Year ended December 31, 2020   
Segment income (loss)$442.2 $(56.1)$386.1 
Revenues from external customers$11,264.0 $0.3 $11,264.3 
Interest income$— $1.0 $1.0 
Interest expense$(0.1)$(51.1)$(51.2)
Loss on early debt extinguishment$— $— $— 
Income tax expense (benefit)$132.9 $(9.9)$123.0 
Significant noncash charges (credits)  
Depreciation and amortization$146.3 $14.7 $161.0 
Accretion of asset retirement obligations$2.3 $— $2.3 
Debt extinguishment costs$— $— $— 
Deferred and noncurrent income taxes (benefits)$2.8 $(0.3)$2.5 
Additions to property, plant and equipment$200.8 $26.3 $227.1 
Total assets at year-end$2,418.2 $267.5 $2,685.7 

Segment Information Corporate and Other Assets 
(Millions of dollars)MarketingConsolidated
Year ended December 31, 2019   
Segment income (loss)$215.0 $(60.2)$154.8 
Revenues from external customers$14,034.3 $0.3 $14,034.6 
Interest income$— $3.2 $3.2 
Interest expense$(0.1)$(54.8)$(54.9)
Loss on early debt extinguishment$— $(14.8)$(14.8)
Income tax expense (benefit)$66.3 $(18.7)$47.6 
Significant noncash charges (credits)  
Depreciation and amortization$138.9 $13.3 $152.2 
Accretion of asset retirement obligations$2.1 $— $2.1 
Debt extinguishment costs$— $4.4 $4.4 
Deferred and noncurrent income taxes (benefits)$32.9 $(9.2)$23.7 
Additions to property, plant and equipment$155.5 $59.1 $214.6 
Total assets at year-end$2,304.7 $382.5 $2,687.2 
Segment Information Corporate and Other Assets 
(Millions of dollars)MarketingConsolidated
Year ended December 31, 2018   
Segment income (loss)$214.2 $(0.6)$213.6 
Revenues from external customers$14,362.3 $0.6 $14,362.9 
Interest income$— $1.5 $1.5 
Interest expense$(0.1)$(52.8)$(52.9)
Income tax expense (benefit)$69.5 $(9.2)$60.3 
Significant noncash charges (credits)  
Depreciation and amortization$124.5 $9.5 $134.0 
Accretion of asset retirement obligations$2.0 $— $2.0 
Deferred and noncurrent income taxes (benefits)$39.0 $(1.1)$37.9 
Additions to property, plant and equipment$169.2 $24.6 $193.8 
Total assets at year-end$2,012.0 $348.8 $2,360.8