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Property, Plant, and Equipment | 3 Months Ended
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Mar. 31, 2022
Property, Plant and Equipment [Abstract] |
Property, Plant, and Equipment | 9. Property, Plant, and Equipment The components of property, plant, and equipment were as follows (dollars in millions):
|  | March 31, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
Land and land improvements |  | $ | 192.9 |  |  | $ | 189.8 |
Buildings |  |  | 949.1 |  |  |  | 938.7 |
Machinery and equipment |  |  | 6,248.6 |  |  |  | 6,159.1 |
Construction in progress |  |  | 581.4 |  |  |  | 481.0 |
Other |  |  | 121.7 |  |  |  | 102.9 |
Property, plant and equipment, at cost |  |  | 8,093.7 |  |  |  | 7,871.5 |
Less accumulated depreciation |  |  | (4,423.0 | ) |  |  | (4,342.5 | )
Property, plant, and equipment, net |  | $ | 3,670.7 |  |  | $ | 3,529.0 |
Depreciation expense for the three months ended March 31, 2022 and 2021 wa s $98.5 million a nd $90.0 million, respectively. We recognized $1.1 million and $0.5 million of incremental depreciation expense during the three months ended March 31, 2022 and 2021, respectively, as a result of the Jackson mill conversion-related activities. At March 31, 2022 and December 31, 2021, purchases of property, plant, and equipment included in accounts payable were $103.1 million and $73.6 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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