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Property, Plant, Equipment and Mine Development (Tables) | 3 Months Ended
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Mar. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | The composition of property, plant, equipment and mine development, net, as of March 31, 2018 and December 31, 2017 is set forth in the table below. Refer to Note 2. “Emergence from the Chapter 11 Cases and Fresh Start Reporting” in the Company's Annual Report on Form 10-K for the year ended December 31, 2017 for details regarding the impact of fresh start reporting on property, plant, equipment and mine development.
| March 31, 2018 |  | December 31, 2017
| (Dollars in millions)
Land and coal interests | $ | 3,891.7 |  |  | $ | 3,890.5 |
Buildings and improvements | 452.3 |  |  | 470.6 |
Machinery and equipment | 1,195.1 |  |  | 1,149.3 |
Less: Accumulated depreciation, depletion and amortization | (531.1 | ) |  | (398.5 | )
Property, plant, equipment and mine development, net | $ | 5,008.0 |  |  | $ | 5,111.9 |

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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 + Details
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