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Property, Plant, and Equipment | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Property, Plant, and Equipment | (6) Property, Plant and Equipment Property, plant and equipment consisted of the following:
| December 31,
| 2017 |  | 2016
| (in millions)
Land and improvements | $ | 47.4 |  |  | $ | 46.5 |
Buildings | 83.3 |  |  | 64.8 |
Machinery and equipment | 3,733.8 |  |  | 3,656.5 |
Automotive equipment | 24.7 |  |  | 24.7 |
Furniture and fixtures | 32.4 |  |  | 28.9 |
Leasehold improvements | 4.6 |  |  | 3.6 |
Aircraft | 3.6 |  |  | 3.6 |
Railcars | 16.8 |  |  | 16.8 |
Construction in progress | 56.2 |  |  | 54.2 |
| 4,002.8 |  |  | 3,899.6 |
Less: Accumulated depreciation | 1,431.0 |  |  | 1,227.5 |
Total Property, plant and equipment, net | $ | 2,571.8 |  |  | $ | 2,672.1 |
Capitalized interest recognized as a reduction in interest expense for the years ended December 31, 2017, 2016 and 2015 totaled approximately $1.1 million, $5.4 million and $3.7 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 December 31, 2017 and 2016. 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 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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