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Property, Plant, and Equipment | 3 Months Ended
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Mar. 31, 2015
Property, Plant and Equipment [Abstract] |
Property, Plant, and Equipment | (5) Property, Plant and Equipment A summary of costs for property, plant, and equipment is as follows:
| March 31, 2015 |  | December 31, 2014
| (in millions)
Land and improvements | $ | 37.7 |  |  | $ | 37.4 |
Buildings | 51.4 |  |  | 50.4 |
Machinery and equipment | 2,606.7 |  |  | 2,581.2 |
Automotive equipment | 22.5 |  |  | 22.1 |
Furniture and fixtures | 19.1 |  |  | 19.0 |
Leasehold improvements | 3.4 |  |  | 3.4 |
Aircraft | 3.7 |  |  | 3.7 |
Railcars | 14.5 |  |  | 14.5 |
Construction in progress | 80.6 |  |  | 71.5 |
| 2,839.6 |  |  | 2,803.2 |
Accumulated depreciation | 928.0 |  |  | 887.2 |
Total property, plant and equipment, net | $ | 1,911.6 |  |  | $ | 1,916.0 |
Capitalized interest recognized as a reduction in interest expense for the three months ended March 31, 2015 and 2014 totaled approximately $0.4 million and $2.3 million, respectively. Land, buildings and equipment that are under a capital lease obligation had an original carrying value of approximately $24.8 million at both March 31, 2015 and December 31, 2014. Amortization of assets held under capital leases is included in depreciation expense.

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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 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: 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=6391110&loc=d3e2921-110230 Reference 3: 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=6360339&loc=d3e1361-107760 Reference 4: 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 + Details
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