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Property, Plant, and Equipment | 12 Months Ended
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Dec. 31, 2014
Property, Plant and Equipment [Abstract] |
Property, Plant, and Equipment | (6) Property, Plant and Equipment A summary of costs for property, plant, and equipment is as follows:
| December 31,
| 2014 |  | 2013
| (in millions)
Land and improvements | $ | 37.4 |  |  | $ | 36.1 |
Buildings | 50.4 |  |  | 42.6 |
Machinery and equipment | 2,581.2 |  |  | 2,312.5 |
Automotive equipment | 22.1 |  |  | 19.2 |
Furniture and fixtures | 19.0 |  |  | 18.3 |
Leasehold improvements | 3.4 |  |  | 2.5 |
Aircraft | 3.7 |  |  | 2.3 |
Railcars | 14.5 |  |  | 7.9 |
Construction in progress | 71.5 |  |  | 164.9 |
| 2,803.2 |  |  | 2,606.3 |
Accumulated depreciation | 887.2 |  |  | 741.9 |
| $ | 1,916.0 |  |  | $ | 1,864.4 |
Capitalized interest recognized as a reduction in interest expense for the years ended December 31, 2014, 2013 and 2012 totaled approximately $9.4 million, $3.6 million and $10.8 million, respectively. Land, building and equipment that are under a capital lease obligation had an original carrying value of approximately $24.8 million at both December 31, 2014 and 2013, respectively. 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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