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Property, Plant, and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2013
Property, Plant and Equipment [Abstract] |
Summary of costs for property, plant, and equipment | The lives used in computing depreciation for such assets are as follows:
Asset | Range of Useful Lives, in Years
Improvements to land | 15 to 30
Buildings | 20 to 30
Machinery and equipment | 5 to 30
Automotive equipment | 5 to 15
Furniture and fixtures | 3 to 10
Aircraft | 20
Railcars | 25 to 40
A summary of costs for property, plant, and equipment is as follows:
| December 31,
| 2013 |  | 2012
| (in millions)
Land and improvements | $ | 36.1 |  |  | $ | 31.0 |
Buildings | 42.6 |  |  | 40.6 |
Machinery and equipment | 2,312.5 |  |  | 2,089.5 |
Automotive equipment | 19.2 |  |  | 15.0 |
Furniture and fixtures | 18.3 |  |  | 13.7 |
Leasehold improvements | 2.5 |  |  | 2.5 |
Aircraft | 2.3 |  |  | — |
Railcars | 7.9 |  |  | 2.5 |
Construction in progress | 164.9 |  |  | 189.2 |
| 2,606.3 |  |  | 2,384.0 |
Accumulated depreciation | 741.9 |  |  | 601.1 |
| $ | 1,864.4 |  |  | $ | 1,782.9 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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