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Revenues - Revenue by Product Type and Market (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended	9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2017	Sep. 30, 2018
Successor
Disaggregation of Revenue [Line Items]
Revenues		$ 1,412.6	$ 1,477.2		$ 2,735.5	$ 4,184.7
Successor | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		1,039.8	1,052.4		1,971.1	2,891.5
Successor | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		369.4	414.1		701.9	1,251.9
Successor | Other
Disaggregation of Revenue [Line Items]
Revenues		3.4	10.7		62.5	41.3
Successor | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		769.0	806.7		1,514.5	2,213.5
Successor | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		270.8	245.7		456.6	678.0
Successor | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		369.4	414.1		701.9	1,251.9
Successor | Operating Segments | Powder River Basin Mining
Disaggregation of Revenue [Line Items]
Revenues		373.7	420.9		786.3	1,084.5
Successor | Operating Segments | Powder River Basin Mining | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		373.7	420.9		782.0	1,084.4
Successor | Operating Segments | Powder River Basin Mining | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Operating Segments | Powder River Basin Mining | Other
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		4.3	0.1
Successor | Operating Segments | Powder River Basin Mining | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		373.7	420.9		782.0	1,084.4
Successor | Operating Segments | Powder River Basin Mining | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Operating Segments | Powder River Basin Mining | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Operating Segments | Midwestern U.S. Mining
Disaggregation of Revenue [Line Items]
Revenues		208.5	207.7		402.6	607.7
Successor | Operating Segments | Midwestern U.S. Mining | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		208.4	207.5		402.3	607.5
Successor | Operating Segments | Midwestern U.S. Mining | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Operating Segments | Midwestern U.S. Mining | Other
Disaggregation of Revenue [Line Items]
Revenues		0.1	0.2		0.3	0.2
Successor | Operating Segments | Midwestern U.S. Mining | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		208.4	207.1		401.9	606.2
Successor | Operating Segments | Midwestern U.S. Mining | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.4		0.4	1.3
Successor | Operating Segments | Midwestern U.S. Mining | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Operating Segments | Western U.S. Mining
Disaggregation of Revenue [Line Items]
Revenues		156.1	155.7		281.1	439.4
Successor | Operating Segments | Western U.S. Mining | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		152.6	158.3		282.1	426.3
Successor | Operating Segments | Western U.S. Mining | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Operating Segments | Western U.S. Mining | Other
Disaggregation of Revenue [Line Items]
Revenues		3.5	(2.6)		(1.0)	13.1
Successor | Operating Segments | Western U.S. Mining | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		149.5	147.1		270.9	410.9
Successor | Operating Segments | Western U.S. Mining | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		3.1	11.2		11.2	15.4
Successor | Operating Segments | Western U.S. Mining | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Operating Segments | Australian Metallurgical Mining
Disaggregation of Revenue [Line Items]
Revenues		370.3	415.9		703.7	1,254.0
Successor | Operating Segments | Australian Metallurgical Mining | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Operating Segments | Australian Metallurgical Mining | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		369.4	414.1		701.9	1,251.9
Successor | Operating Segments | Australian Metallurgical Mining | Other
Disaggregation of Revenue [Line Items]
Revenues		0.9	1.8		1.8	2.1
Successor | Operating Segments | Australian Metallurgical Mining | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Operating Segments | Australian Metallurgical Mining | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Operating Segments | Australian Metallurgical Mining | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		369.4	414.1		701.9	1,251.9
Successor | Operating Segments | Australian Thermal Mining
Disaggregation of Revenue [Line Items]
Revenues		305.1	265.8		505.0	773.9
Successor | Operating Segments | Australian Thermal Mining | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		305.1	265.7		504.7	773.3
Successor | Operating Segments | Australian Thermal Mining | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Operating Segments | Australian Thermal Mining | Other
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.1		0.3	0.6
Successor | Operating Segments | Australian Thermal Mining | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		37.4	31.6		59.7	112.0
Successor | Operating Segments | Australian Thermal Mining | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		267.7	234.1		445.0	661.3
Successor | Operating Segments | Australian Thermal Mining | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Corporate, Non-Segment | Trading and Brokerage
Disaggregation of Revenue [Line Items]
Revenues		22.6	19.4		24.6	52.7
Successor | Corporate, Non-Segment | Trading and Brokerage | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Corporate, Non-Segment | Trading and Brokerage | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Corporate, Non-Segment | Trading and Brokerage | Other
Disaggregation of Revenue [Line Items]
Revenues		22.6	19.4		24.6	52.7
Successor | Corporate, Non-Segment | Trading and Brokerage | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Corporate, Non-Segment | Trading and Brokerage | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Corporate, Non-Segment | Trading and Brokerage | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues		0.0	0.0		0.0	0.0
Successor | Corporate, Non-Segment | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenues	[1]	(23.7)	(8.2)		32.2	(27.5)
Successor | Corporate, Non-Segment | Corporate and Other | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	[1]	0.0	0.0		0.0	0.0
Successor | Corporate, Non-Segment | Corporate and Other | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	[1]	0.0	0.0		0.0	0.0
Successor | Corporate, Non-Segment | Corporate and Other | Other
Disaggregation of Revenue [Line Items]
Revenues	[1]	(23.7)	(8.2)		32.2	(27.5)
Successor | Corporate, Non-Segment | Corporate and Other | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	[1]	0.0	0.0		0.0	0.0
Successor | Corporate, Non-Segment | Corporate and Other | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	[1]	0.0	0.0		0.0	0.0
Successor | Corporate, Non-Segment | Corporate and Other | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	[1]	$ 0.0	$ 0.0		$ 0.0	$ 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	[1]			20.3
Predecessor | Corporate, Non-Segment | Corporate and Other | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	[1]			0.0
Predecessor | Corporate, Non-Segment | Corporate and Other | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	[1]			0.0
Predecessor | Corporate, Non-Segment | Corporate and Other | Other
Disaggregation of Revenue [Line Items]
Revenues	[1]			20.3
Predecessor | Corporate, Non-Segment | Corporate and Other | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	[1]			0.0
Predecessor | Corporate, Non-Segment | Corporate and Other | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	[1]			0.0
Predecessor | Corporate, Non-Segment | Corporate and Other | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	[1]			$ 0.0
[1] Corporate and Other revenue includes unrealized gains and losses related to mark-to-market activity from economic hedge activities intended to hedge future coal sales. Such net unrealized losses were $26.8 million and $10.8 million during the three months ended September 30, 2018 and 2017, respectively, and $36.3 million and $1.4 million during the nine months ended September 30, 2018 and the period April 2 through September 30, 2017, respectively. During the period January 1 through April 1, 2017, such net unrealized gains were $16.6 million. When such gains and losses are realized in connection with recognition of the underlying transaction, they are reclassified to realized gains and losses and are then reflected in Trading and Brokerage revenue (realized losses of $11.6 million and $12.3 million during the three months ended September 30, 2018 and 2017, respectively, and $41.1 million, $20.0 million and $11.1 million during the nine months ended September 30, 2018 and the periods April 2 through September 30, 2017 and January 1 through April 1, 2017, respectively). At September 30, 2018 and December 31, 2017, the financial contracts’ fair values resulted in net liabilities, excluding margin, of $75.2 million and $38.9 million, respectively.

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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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