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Business Segments (Tables)
9 Months Ended
Sep. 30, 2023
Segment Reporting [Abstract]  
Schedule of Information by Business Segment
  Three Months Ended
  September 30, 2023September 30, 2022
(Millions of dollars)Total Assets at September 30, 2023External RevenuesIncome (Loss)External RevenuesIncome (Loss)
Marketing$4,042.0 $5,797.8 $187.2 $6,194.4 $236.8 
Corporate and other assets263.3 0.1 (19.5)0.3 (17.3)
Total$4,305.3 $5,797.9 $167.7 $6,194.7 $219.5 
Nine Months Ended
September 30, 2023September 30, 2022
 External RevenuesIncome (Loss)External RevenuesIncome (Loss)
(Millions of dollars)
Marketing$16,460.3 $464.8 $18,079.4 $605.0 
Corporate and other assets0.2 (58.0)0.4 (49.8)
Total$16,460.5 $406.8 $18,079.8 $555.2