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Property, Plant, and Equipment | 9 Months Ended
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Sep. 30, 2023
Property, Plant and Equipment [Abstract] |
Property, Plant, and Equipment | 8. Property, Plant, and Equipment The components of property, plant, and equipment were as follows (dollars in millions):
|  | September 30, |  |  | December 31, |
|  | 2023 |  |  | 2022 |
Land and land improvements |  | $ | 196.9 |  |  | $ | 192.4 |
Buildings |  |  | 1,069.2 |  |  |  | 1,023.6 |
Machinery and equipment |  |  | 6,925.5 |  |  |  | 6,709.3 |
Construction in progress |  |  | 362.5 |  |  |  | 440.2 |
Other |  |  | 175.3 |  |  |  | 146.9 |
Property, plant and equipment, at cost |  |  | 8,729.4 |  |  |  | 8,512.4 |
Less accumulated depreciation |  |  | (4,866.0 | ) |  |  | (4,612.4 | )
Property, plant, and equipment, net |  | $ | 3,863.4 |  |  | $ | 3,900.0 |
Depreciation expense for the three months ended September 30, 2023 and 2022 wa s $118.6 million a nd $103.2 million, respectively. During the nine months ended September 30, 2023 and 2022, depreciation expense was $354.9 million and $305.3 million, respectively. During the nine months ended September 30, 2023, we recognized $11.9 million of incremental depreciation expense as a result of Jackson mill conversion-related activities and closure costs related to corrugated products facilities and design centers. We recognized $3.1 million of incremental depreciation expense during the nine months ended September 30, 2022 as a result of Jackson mill conversion-related activities and closure costs related to corrugated products facilities. At September 30, 2023 and December 31, 2022, purchases of property, plant, and equipment included in accounts payable were $40.2 million and $43.7 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://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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