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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 | Note 6. Property, Plant and Equipment Property, plant and equipment consists of the following:
(in millions) |  | 2020 |  |  | 2019 |
Land |  | $ | 21.6 |  |  | $ | 19.8 |
Buildings |  |  | 65.5 |  |  |  | 60.0 |
Equipment |  |  | 349.9 |  |  |  | 330.7 |
Work in progress |  |  | 27.5 |  |  |  | 19.0 |
|  |  | 464.5 |  |  |  | 429.5 |
Less accumulated depreciation and impairment |  |  | (253.7 | ) |  |  | (230.8 | )
|  | $ | 210.8 |  |  | $ | 198.7 |
Of the total net book value of equipment at December 31, 2020 $1.0 million (2019 – $1.8 million) are in respect of assets held under finance leases. Depreciation charges were $24.7 million, $23.6 million and $22.6 million in 2020, 2019 and 2018, respectively. An impairment charge of $2.0 million was incurred in 2020 as a result of the Octane Additives segment ceasing to trade on June 30, 2020.

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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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