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Property, Plant, Equipment and Mine Development (Details) - Successor - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
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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Mineral rights at exploration properties acquired in a business combination.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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-Publisher FASB
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Carrying amount at the balance sheet date of mineral rights, or rights to extract a mineral from the earth or to receive payment in the form of a royalty for the extraction of minerals, net of amortization.

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