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Revenues - Revenues by Contract Duration (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Successor
Disaggregation of Revenue [Line Items]
Revenues	$ 1,462.7
Successor | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues	488.1
Successor | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues	745.0
Successor | Spot
Disaggregation of Revenue [Line Items]
Revenues	162.3
Successor | Other
Disaggregation of Revenue [Line Items]
Revenues	67.3
Successor | Operating Segments | Powder River Basin Mining
Disaggregation of Revenue [Line Items]
Revenues	389.3
Successor | Operating Segments | Powder River Basin Mining | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues	211.8
Successor | Operating Segments | Powder River Basin Mining | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues	131.6
Successor | Operating Segments | Powder River Basin Mining | Spot
Disaggregation of Revenue [Line Items]
Revenues	45.8
Successor | Operating Segments | Powder River Basin Mining | Other
Disaggregation of Revenue [Line Items]
Revenues	0.1
Successor | Operating Segments | Australian Thermal Mining
Disaggregation of Revenue [Line Items]
Revenues	201.4
Successor | Operating Segments | Australian Thermal Mining | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues	44.6
Successor | Operating Segments | Australian Thermal Mining | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues	132.7
Successor | Operating Segments | Australian Thermal Mining | Spot
Disaggregation of Revenue [Line Items]
Revenues	23.7
Successor | Operating Segments | Australian Thermal Mining | Other
Disaggregation of Revenue [Line Items]
Revenues	0.4
Successor | Operating Segments | Australian Metallurgical Mining
Disaggregation of Revenue [Line Items]
Revenues	466.2
Successor | Operating Segments | Australian Metallurgical Mining | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues	7.6
Successor | Operating Segments | Australian Metallurgical Mining | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues	389.9
Successor | Operating Segments | Australian Metallurgical Mining | Spot
Disaggregation of Revenue [Line Items]
Revenues	67.8
Successor | Operating Segments | Australian Metallurgical Mining | Other
Disaggregation of Revenue [Line Items]
Revenues	0.9
Successor | Operating Segments | Western U.S. Mining
Disaggregation of Revenue [Line Items]
Revenues	143.7
Successor | Operating Segments | Western U.S. Mining | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues	117.7
Successor | Operating Segments | Western U.S. Mining | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues	9.6
Successor | Operating Segments | Western U.S. Mining | Spot
Disaggregation of Revenue [Line Items]
Revenues	11.0
Successor | Operating Segments | Western U.S. Mining | Other
Disaggregation of Revenue [Line Items]
Revenues	5.4
Successor | Operating Segments | Midwestern U.S. Mining
Disaggregation of Revenue [Line Items]
Revenues	201.7
Successor | Operating Segments | Midwestern U.S. Mining | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues	106.4
Successor | Operating Segments | Midwestern U.S. Mining | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues	81.2
Successor | Operating Segments | Midwestern U.S. Mining | Spot
Disaggregation of Revenue [Line Items]
Revenues	14.0
Successor | Operating Segments | Midwestern U.S. Mining | Other
Disaggregation of Revenue [Line Items]
Revenues	0.1
Successor | Corporate, Non-Segment | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenues	40.3
Successor | Corporate, Non-Segment | Corporate and Other | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Corporate, Non-Segment | Corporate and Other | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Corporate, Non-Segment | Corporate and Other | Spot
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 | Trading and Brokerage
Disaggregation of Revenue [Line Items]
Revenues	20.1
Successor | Corporate, Non-Segment | Trading and Brokerage | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Corporate, Non-Segment | Trading and Brokerage | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Corporate, Non-Segment | Trading and Brokerage | Spot
Disaggregation of Revenue [Line Items]
Revenues	0.0
Successor | Corporate, Non-Segment | Trading and Brokerage | Other
Disaggregation of Revenue [Line Items]
Revenues	$ 20.1
Predecessor
Disaggregation of Revenue [Line Items]
Revenues		$ 1,326.2
Predecessor | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues		526.2
Predecessor | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues		528.7
Predecessor | Spot
Disaggregation of Revenue [Line Items]
Revenues		215.2
Predecessor | Other
Disaggregation of Revenue [Line Items]
Revenues		56.1
Predecessor | Operating Segments | Powder River Basin Mining
Disaggregation of Revenue [Line Items]
Revenues		394.3
Predecessor | Operating Segments | Powder River Basin Mining | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues		238.5
Predecessor | Operating Segments | Powder River Basin Mining | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues		119.2
Predecessor | Operating Segments | Powder River Basin Mining | Spot
Disaggregation of Revenue [Line Items]
Revenues		36.6
Predecessor | Operating Segments | Powder River Basin Mining | Other
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Operating Segments | Australian Thermal Mining
Disaggregation of Revenue [Line Items]
Revenues		224.8
Predecessor | Operating Segments | Australian Thermal Mining | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues		33.4
Predecessor | Operating Segments | Australian Thermal Mining | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues		100.7
Predecessor | Operating Segments | Australian Thermal Mining | Spot
Disaggregation of Revenue [Line Items]
Revenues		90.4
Predecessor | Operating Segments | Australian Thermal Mining | Other
Disaggregation of Revenue [Line Items]
Revenues		0.3
Predecessor | Operating Segments | Australian Metallurgical Mining
Disaggregation of Revenue [Line Items]
Revenues		328.9
Predecessor | Operating Segments | Australian Metallurgical Mining | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues		4.9
Predecessor | Operating Segments | Australian Metallurgical Mining | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues		235.7
Predecessor | Operating Segments | Australian Metallurgical Mining | Spot
Disaggregation of Revenue [Line Items]
Revenues		84.0
Predecessor | Operating Segments | Australian Metallurgical Mining | Other
Disaggregation of Revenue [Line Items]
Revenues		4.3
Predecessor | Operating Segments | Western U.S. Mining
Disaggregation of Revenue [Line Items]
Revenues		149.7
Predecessor | Operating Segments | Western U.S. Mining | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues		119.4
Predecessor | Operating Segments | Western U.S. Mining | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues		9.9
Predecessor | Operating Segments | Western U.S. Mining | Spot
Disaggregation of Revenue [Line Items]
Revenues		4.2
Predecessor | Operating Segments | Western U.S. Mining | Other
Disaggregation of Revenue [Line Items]
Revenues		16.2
Predecessor | Operating Segments | Midwestern U.S. Mining
Disaggregation of Revenue [Line Items]
Revenues		193.2
Predecessor | Operating Segments | Midwestern U.S. Mining | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues		130.0
Predecessor | Operating Segments | Midwestern U.S. Mining | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues		63.2
Predecessor | Operating Segments | Midwestern U.S. Mining | Spot
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 | Corporate, Non-Segment | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenues		20.3
Predecessor | Corporate, Non-Segment | Corporate and Other | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Corporate, Non-Segment | Corporate and Other | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Corporate, Non-Segment | Corporate and Other | Spot
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 | Trading and Brokerage
Disaggregation of Revenue [Line Items]
Revenues		15.0
Predecessor | Corporate, Non-Segment | Trading and Brokerage | Long-term contracts
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Corporate, Non-Segment | Trading and Brokerage | Short-term contracts
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Corporate, Non-Segment | Trading and Brokerage | Spot
Disaggregation of Revenue [Line Items]
Revenues		0.0
Predecessor | Corporate, Non-Segment | Trading and Brokerage | Other
Disaggregation of Revenue [Line Items]
Revenues		$ 15.0

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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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