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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)						Marketing																		Consolidated
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)						Marketing																		Consolidated
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)						Marketing																		Consolidated
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

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- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8813-108599

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

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No definition available.

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