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Property, Plant, Equipment and Mine Development (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Successor |  |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |  |
Land and coal interests | $ 3,890.5 |  |
Buildings and improvements | 470.6 |  |
Machinery and equipment | 1,149.3 |  |
Less: accumulated depreciation, depletion and amortization | (398.5) |  |
Property, plant, equipment and mine development, net | 5,111.9 |  |
Coal reserves | 3,000.0 |  |
Coal reserves not subject to depletion | 200.0 |  |
Acquired interest in mineral rights | 100.0 |  |
Successor | Mining Properties and Mineral Rights [Member] |  |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |  |
Mineral rights and advanced royalties | 2,000.0 |  |
Successor | Coal reserves held by fee ownership [Member] |  |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |  |
Coal reserves | $ 1,000.0 |  |
Predecessor |  |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |  |
Land and coal interests |  | $ 10,330.8 |
Buildings and improvements |  | 1,507.6 |
Machinery and equipment |  | 2,130.2 |
Less: accumulated depreciation, depletion and amortization |  | (5,191.9) |
Property, plant, equipment and mine development, net |  | 8,776.7 | $ 9,258.5
Coal reserves |  | 5,500.0 |
Coal reserves not subject to depletion |  | 1,600.0 |
Acquired interest in mineral rights |  | 1,200.0 |
Predecessor | Mining Properties and Mineral Rights [Member] |  |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |  |
Mineral rights and advanced royalties |  | 4,400.0 |
Predecessor | Coal reserves held by fee ownership [Member] |  |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |  |
Coal reserves |  | $ 1,100.0 |

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