Business Segment (Tables)

6 Months Ended

Jun. 30, 2020

Segment Reporting [Abstract]

Summary of Information by Business Segment

			Three Months Ended
			June 30, 2020				June 30, 2019
	Total Assets at		External Revenues		Income (Loss)		External Revenues		Income (Loss)
(Millions of dollars)	June 30, 2020
Marketing	$	2,353.2	$	2,379.6	$	179.6	$	3,800.4	$	44.5
Corporate and other assets	507.5		—		(10.7)		—		(11.8)
Total	$	2,860.7	$	2,379.6	$	168.9	$	3,800.4	$	32.7

	Six Months Ended
	June 30, 2020				June 30, 2019
	External Revenues		Income (Loss)		External Revenues		Income (Loss)
(Millions of dollars)
Marketing	$	5,564.3	$	280.5	$	6,916.7	$	60.7
Corporate and other assets	0.1		(22.3)		0.1		(22.7)
Total	$	5,564.4	$	258.2	$	6,916.8	$	38.0