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Business Segment (Tables)
3 Months Ended
Mar. 31, 2020
Segment Reporting [Abstract]  
Summary of Information by Business Segment
  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