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Property, Plant, and Equipment | 9 Months Ended
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Sep. 30, 2021
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, |
|  | 2021 |  |  | 2020 |
Land and land improvements |  | $ | 186.2 |  |  | $ | 179.6 |
Buildings |  |  | 895.5 |  |  |  | 858.5 |
Machinery and equipment |  |  | 6,055.2 |  |  |  | 5,826.6 |
Construction in progress |  |  | 417.5 |  |  |  | 360.0 |
Other |  |  | 97.4 |  |  |  | 88.8 |
Property, plant and equipment, at cost |  |  | 7,651.8 |  |  |  | 7,313.5 |
Less accumulated depreciation |  |  | (4,291.0 | ) |  |  | (4,120.1 | )
Property, plant, and equipment, net |  | $ | 3,360.8 |  |  | $ | 3,193.4 |
During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions arising from the COVID-19 pandemic and the estimated impact on our Paper segment and its projected future results of operations, we identified a triggering event indicating possible impairment of our long lived assets within our Paper segment, including property, plant, and equipment, and performed a recoverability test on the Paper reporting unit long lived assets as of May 31, 2020. The recoverability test was based on forecasts of undiscounted cash flows. The results of the recoverability test indicated that the long lived assets within our Paper segment, inclusive of property, plant, and equipment, were 100% recoverable. Depreciation expense for the three months ended September 30, 2021 and 2020 was $95.5 million and $89.6 million, respectively. During the nine months ended September 30, 2021 and 2020, depreciation expense was $279.9 million and $272.7 million, respectively. We recognized $3.6 million of incremental depreciation expense during the nine months ended September 30, 2021 as a result of corrugated products facilities closures and the Jackson, Alabama mill conversion. We recognized $2.9 million of incremental depreciation expense during the nine months ended September 30, 2020 as a result of the closure of the San Lorenzo, California corrugated products facility. At September 30, 2021 and December 31, 2020, purchases of property, plant, and equipment included in accounts payable were $112.1 million and $22.2 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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