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Revenues - Revenue by Product Type and Market (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Successor
Disaggregation of Revenue [Line Items]
Revenues	$ 1,462.7
Successor | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	930.1
Successor | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	465.3
Successor | Other
Disaggregation of Revenue [Line Items]
Revenues	67.3
Successor | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	756.5
Successor | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	173.6
Successor | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	465.3
Successor | Operating Segments | Powder River Basin Mining
Disaggregation of Revenue [Line Items]
Revenues	389.3
Successor | Operating Segments | Powder River Basin Mining | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	389.2
Successor | Operating Segments | Powder River Basin Mining | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Operating Segments | Powder River Basin Mining | Other
Disaggregation of Revenue [Line Items]
Revenues	0.1
Successor | Operating Segments | Powder River Basin Mining | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	389.2
Successor | Operating Segments | Powder River Basin Mining | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Operating Segments | Powder River Basin Mining | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Operating Segments | Midwestern U.S. Mining
Disaggregation of Revenue [Line Items]
Revenues	201.7
Successor | Operating Segments | Midwestern U.S. Mining | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	201.6
Successor | Operating Segments | Midwestern U.S. Mining | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Operating Segments | Midwestern U.S. Mining | Other
Disaggregation of Revenue [Line Items]
Revenues	0.1
Successor | Operating Segments | Midwestern U.S. Mining | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	200.9
Successor | Operating Segments | Midwestern U.S. Mining | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.7
Successor | Operating Segments | Midwestern U.S. Mining | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Operating Segments | Western U.S. Mining
Disaggregation of Revenue [Line Items]
Revenues	143.7
Successor | Operating Segments | Western U.S. Mining | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	138.3
Successor | Operating Segments | Western U.S. Mining | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Operating Segments | Western U.S. Mining | Other
Disaggregation of Revenue [Line Items]
Revenues	5.4
Successor | Operating Segments | Western U.S. Mining | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	130.3
Successor | Operating Segments | Western U.S. Mining | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	8.0
Successor | Operating Segments | Western U.S. Mining | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Operating Segments | Australian Metallurgical Mining
Disaggregation of Revenue [Line Items]
Revenues	466.2
Successor | Operating Segments | Australian Metallurgical Mining | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Operating Segments | Australian Metallurgical Mining | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	465.3
Successor | Operating Segments | Australian Metallurgical Mining | Other
Disaggregation of Revenue [Line Items]
Revenues	0.9
Successor | Operating Segments | Australian Metallurgical Mining | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Operating Segments | Australian Metallurgical Mining | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Operating Segments | Australian Metallurgical Mining | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	465.3
Successor | Operating Segments | Australian Thermal Mining
Disaggregation of Revenue [Line Items]
Revenues	201.4
Successor | Operating Segments | Australian Thermal Mining | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	201.0
Successor | Operating Segments | Australian Thermal Mining | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Operating Segments | Australian Thermal Mining | Other
Disaggregation of Revenue [Line Items]
Revenues	0.4
Successor | Operating Segments | Australian Thermal Mining | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	36.1
Successor | Operating Segments | Australian Thermal Mining | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	164.9
Successor | Operating Segments | Australian Thermal Mining | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Corporate, Non-Segment | Trading and Brokerage
Disaggregation of Revenue [Line Items]
Revenues	20.1
Successor | Corporate, Non-Segment | Trading and Brokerage | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Corporate, Non-Segment | Trading and Brokerage | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Corporate, Non-Segment | Trading and Brokerage | Other
Disaggregation of Revenue [Line Items]
Revenues	20.1
Successor | Corporate, Non-Segment | Trading and Brokerage | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Corporate, Non-Segment | Trading and Brokerage | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Corporate, Non-Segment | Trading and Brokerage | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Corporate, Non-Segment | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenues	40.3
Successor | Corporate, Non-Segment | Corporate and Other | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Corporate, Non-Segment | Corporate and Other | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Corporate, Non-Segment | Corporate and Other | Other
Disaggregation of Revenue [Line Items]
Revenues	40.3
Successor | Corporate, Non-Segment | Corporate and Other | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Corporate, Non-Segment | Corporate and Other | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Corporate, Non-Segment | Corporate and Other | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	$ 0.0
Predecessor
Disaggregation of Revenue [Line Items]
Revenues		$ 1,326.2
Predecessor | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		945.5
Predecessor | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		324.6
Predecessor | Other
Disaggregation of Revenue [Line Items]
Revenues		56.1
Predecessor | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		748.3
Predecessor | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		197.2
Predecessor | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		324.6
Predecessor | Operating Segments | Powder River Basin Mining
Disaggregation of Revenue [Line Items]
Revenues		394.3
Predecessor | Operating Segments | Powder River Basin Mining | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		394.3
Predecessor | Operating Segments | Powder River Basin Mining | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Powder River Basin Mining | Other
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Powder River Basin Mining | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		394.3
Predecessor | Operating Segments | Powder River Basin Mining | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Powder River Basin Mining | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Midwestern U.S. Mining
Disaggregation of Revenue [Line Items]
Revenues		193.2
Predecessor | Operating Segments | Midwestern U.S. Mining | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		193.2
Predecessor | Operating Segments | Midwestern U.S. Mining | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Midwestern U.S. Mining | Other
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Midwestern U.S. Mining | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		193.2
Predecessor | Operating Segments | Midwestern U.S. Mining | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Midwestern U.S. Mining | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Western U.S. Mining
Disaggregation of Revenue [Line Items]
Revenues		149.7
Predecessor | Operating Segments | Western U.S. Mining | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		133.5
Predecessor | Operating Segments | Western U.S. Mining | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Western U.S. Mining | Other
Disaggregation of Revenue [Line Items]
Revenues		16.2
Predecessor | Operating Segments | Western U.S. Mining | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		133.5
Predecessor | Operating Segments | Western U.S. Mining | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Western U.S. Mining | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Australian Metallurgical Mining
Disaggregation of Revenue [Line Items]
Revenues		328.9
Predecessor | Operating Segments | Australian Metallurgical Mining | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Australian Metallurgical Mining | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		324.6
Predecessor | Operating Segments | Australian Metallurgical Mining | Other
Disaggregation of Revenue [Line Items]
Revenues		4.3
Predecessor | Operating Segments | Australian Metallurgical Mining | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Australian Metallurgical Mining | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Australian Metallurgical Mining | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		324.6
Predecessor | Operating Segments | Australian Thermal Mining
Disaggregation of Revenue [Line Items]
Revenues		224.8
Predecessor | Operating Segments | Australian Thermal Mining | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		224.5
Predecessor | Operating Segments | Australian Thermal Mining | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Australian Thermal Mining | Other
Disaggregation of Revenue [Line Items]
Revenues		0.3
Predecessor | Operating Segments | Australian Thermal Mining | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		27.3
Predecessor | Operating Segments | Australian Thermal Mining | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		197.2
Predecessor | Operating Segments | Australian Thermal Mining | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Corporate, Non-Segment | Trading and Brokerage
Disaggregation of Revenue [Line Items]
Revenues		15.0
Predecessor | Corporate, Non-Segment | Trading and Brokerage | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Corporate, Non-Segment | Trading and Brokerage | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Corporate, Non-Segment | Trading and Brokerage | Other
Disaggregation of Revenue [Line Items]
Revenues		15.0
Predecessor | Corporate, Non-Segment | Trading and Brokerage | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Corporate, Non-Segment | Trading and Brokerage | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Corporate, Non-Segment | Trading and Brokerage | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Corporate, Non-Segment | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenues		20.3
Predecessor | Corporate, Non-Segment | Corporate and Other | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Corporate, Non-Segment | Corporate and Other | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Corporate, Non-Segment | Corporate and Other | Other
Disaggregation of Revenue [Line Items]
Revenues		20.3
Predecessor | Corporate, Non-Segment | Corporate and Other | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Corporate, Non-Segment | Corporate and Other | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Corporate, Non-Segment | Corporate and Other | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		$ 0.0

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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