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Property, Plant, and Equipment | 6 Months Ended
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Jun. 30, 2019
Property Plant And Equipment [Abstract] |
Property, Plant, and Equipment |
10. | Property, Plant, and Equipment
The components of property, plant, and equipment were as follows (dollars in millions):
|  | June 30, |  |  | December 31, |
|  | 2019 |  |  | 2018 |
Land and land improvements |  | $ | 167.7 |  |  | $ | 161.9 |
Buildings |  |  | 812.0 |  |  |  | 795.5 |
Machinery and equipment |  |  | 5,603.6 |  |  |  | 5,481.6 |
Construction in progress |  |  | 172.2 |  |  |  | 176.7 |
Other |  |  | 78.1 |  |  |  | 75.4 |
Property, plant and equipment, at cost |  |  | 6,833.6 |  |  |  | 6,691.1 |
Less accumulated depreciation |  |  | (3,726.4 | ) |  |  | (3,582.5 | )
Property, plant, and equipment, net |  | $ | 3,107.2 |  |  | $ | 3,108.6 |
Depreciation expense for the three months ended June 30, 2019 and 2018 was $85.8 million and $91.6 million, respectively. During the six months ended June 30, 2019 and 2018, depreciation expense was $171.0 million and $186.2 million, respectively. We recognized $0.2 million and $13.5 million of incremental depreciation expense during the six months ended June 30, 2019 and 2018, respectively, as a result of shortening the useful lives of certain assets primarily related to the Wallula mill restructuring. At June 30, 2019 and December 31, 2018, purchases of property, plant, and equipment included in accounts payable were $27.0 million and $24.7 million, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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