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Property, Plant, Equipment and Mine Development (Details) - Successor - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Property, Plant, Equipment and Mine Development[Line Items] |  |
Less: Accumulated depreciation, depletion and amortization | $ (957.4) | $ (398.5)
Property, plant, equipment and mine development, net | 5,207.0 | 5,111.9
Coal reserves | 3,000.0 | 3,000.0
Coal reserves not subject to depletion | 200.0 | 200.0
Acquired interest in mineral rights | 100.0 | 100.0
Land and coal interests |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |
Property, Plant and Equipment, Gross | 4,148.8 | 3,890.5
Buildings and improvements |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |
Property, Plant and Equipment, Gross | 559.3 | 470.6
Machinery and equipment |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |
Property, Plant and Equipment, Gross | 1,456.3 | 1,149.3
Mining Properties and Mineral Rights |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |
Mineral rights and advanced royalties | 2,100.0 | 2,000.0
Coal Reserves Held by Fee Ownership |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |
Coal reserves | $ 900.0 | $ 1,000.0

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -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 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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