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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment
|  |  |  | December 31, 2020 |  | December 31, 2019
(Millions of dollars) |  | Estimated Useful Life |  | Cost |  | Net |  | Cost |  | Net
Land |  |  |  | $ | 609.5 |  |  | $ | 609.5 |  |  | $ | 598.6 |  |  | $ | 598.6 |
Pipeline and terminal facilities |  | 16 to 25 years |  | 79.8 |  |  | 43.5 |  |  | 77.5 |  |  | 43.7 |
Retail gasoline stations |  | 3 to 50 years |  | 2,179.7 |  |  | 1,123.2 |  |  | 2,034.4 |  |  | 1,073.6 |
Buildings |  | 20 to 45 years |  | 66.7 |  |  | 48.5 |  |  | 60.5 |  |  | 44.9 |
Other |  | 3 to 20 years |  | 123.3 |  |  | 42.9 |  |  | 115.5 |  |  | 46.5 |
|  |  |  | $ | 3,059.0 |  |  | $ | 1,867.6 |  |  | $ | 2,886.5 |  |  | $ | 1,807.3 |
Depreciation expense of $160.0 million, $151.2 million and $132.5 million was recorded for the years ended December 31, 2020, 2019 and 2018, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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