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Property, Plant, Equipment and Mine Development (Tables) | 6 Months Ended
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Jun. 30, 2017
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | The composition of property, plant, equipment and mine development, net, as of June 30, 2017 and December 31, 2016 is set forth in the table below. Refer to Note 3. "Emergence from the Chapter 11 Cases and Fresh Start Reporting" for details regarding the impact of fresh start reporting on property, plant, equipment and mine development.
| Successor | Predecessor
| June 30, 2017 | December 31, 2016
| (Dollars in millions)
Land and coal interests | $ | 3,785.8 |  | $ | 10,330.8 |
Buildings and improvements | 467.3 |  | 1,507.6 |
Machinery and equipment | 1,084.9 |  | 2,130.2 |
Less: Accumulated depreciation, depletion and amortization | (123.8 | ) | (5,191.9 | )
Total, net | $ | 5,214.2 |  | $ | 8,776.7 |

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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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