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Property, Plant, Equipment and Mine Development (Notes) | 12 Months Ended
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Dec. 31, 2017
Property, Plant, Equipment and Mine Development [Abstract] |
Property, Plant and Equipment Disclosure [Text Block] | Property, Plant, Equipment and Mine Development Property, plant, equipment and mine development, net, as of December 31, 2017 and December 31, 2016 consisted of the following:
| Successor | Predecessor
| December 31, 2017 | December 31, 2016
| (Dollars in millions)
Land and coal interests | $ | 3,890.5 |  | $ | 10,330.8 |
Buildings and improvements | 470.6 |  | 1,507.6 |
Machinery and equipment | 1,149.3 |  | 2,130.2 |
Less: Accumulated depreciation, depletion and amortization | (398.5 | ) | (5,191.9 | )
Property, plant, equipment and mine development, net | $ | 5,111.9 |  | $ | 8,776.7 |
As more fully described in Note 2. “Emergence from the Chapter 11 Cases and Fresh Start Reporting,” all of the Company’s property, plant, equipment and mine development assets were adjusted to fair value upon emergence from the Chapter 11 Cases in connection with fresh start reporting. Land and coal interests included coal reserves with a net book value of $3.0 billion and $5.5 billion as of December 31, 2017 and 2016, respectively. Such coal reserves were comprised of mineral rights for leased coal interests and advance royalties that had a net book value of $2.0 billion and $4.4 billion as of December 31, 2017 and 2016, respectively, and coal reserves held by fee ownership of $1.0 billion and $1.1 billion at December 31, 2017 and 2016, respectively. The amount of coal reserves not subject to current depletion at properties where the Company was not currently engaged in mining operations or leasing to third parties was $0.2 billion and $1.6 billion as of December 31, 2017 and 2016, respectively. Land and coal interests also include acquired interests in mineral rights at certain Australian exploration properties that had a net book value of $0.1 billion and $1.2 billion as of December 31, 2017 and 2016, respectively.

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- Definition Property, Plant, Equipment and Mine Development [Abstract] + References No definition available. + Details
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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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