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Business Segments (Tables)
12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Summary of Information by Business Segment
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