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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Note 10. Property, Plant and Equipment The major categories of property, plant and equipment and accumulated depreciation and depletion are presented below:
|  | December 31, |
(millions of dollars) |  | 2021 |  |  | 2020 |
Mineral rights and reserves |  | $ | 554.7 |  |  | $ | 565.8 |
Land |  |  | 50.6 |  |  |  | 50.9 |
Buildings |  |  | 229.2 |  |  |  | 225.6 |
Machinery and equipment |  |  | 1,262.8 |  |  |  | 1,254.3 |
Furniture and fixtures and other |  |  | 139.9 |  |  |  | 138.9 |
Construction in progress |  |  | 59.2 |  |  |  | 41.4 |
|  |  | 2,296.4 |  |  |  | 2,276.9 |
Less: accumulated depreciation and depletion |  |  | (1,247.3 | ) |  |  | (1,237.3 | )
Property, plant and equipment, net |  | $ | 1,049.1 |  |  | $ | 1,039.6 |
In November 2021, the Company acquired Specialty PCC assets from a company in the Midwest United States for $6.9 million. In the third quarter of 2020, the Company acquired the assets of a mining and hauling company in the western United States for $9.2 million to support our bentonite clay mining operations. Depreciation and depletion expense for the years ended December 31, 2021, 2020 and 2019 was $77.4 million, $77.9 million and $82.1 million, 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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