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Property, Plant, and Equipment | 3 Months Ended
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Mar. 31, 2016
Property, Plant and Equipment [Abstract] |
Property, Plant, and Equipment | Property, Plant, and Equipment The components of property, plant, and equipment were as follows (dollars in millions):
| March 31, 2016 |  | December 31, 2015
Land and land improvements | $ | 146.2 |  |  | $ | 146.4 |
Buildings | 641.3 |  |  | 640.9 |
Machinery and equipment | 4,769.9 |  |  | 4,747.1 |
Construction in progress | 148.3 |  |  | 119.1 |
Other | 64.8 |  |  | 61.3 |
Property, plant, and equipment, at cost | 5,770.5 |  |  | 5,714.8 |
Less accumulated depreciation | (2,952.6 | ) |  | (2,882.7 | )
Property, plant, and equipment, net | $ | 2,817.9 |  |  | $ | 2,832.1 |
Depreciation expense for the three months ended March 31, 2016 and 2015 was $80.7 million and $85.2 million, respectively. During the three months ended March 31, 2016 we recognized $0.1 million of incremental depreciation expense from shortening the useful lives of assets related to facilities closures. During the three months ended March 31, 2015 we recognized $9.0 million of incremental depreciation expense from shortening the useful lives of assets at our DeRidder, Louisiana mill as a result of restructuring activities. At March 31, 2016 and December 31, 2015 purchases of property, plant, and equipment included in accounts payable were $29.4 million and $15.0 million.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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