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Segment Information - Assets by Segment (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Successor
Segment Reporting Information [Line Items]
Assets	$ 8,315.2
Property, plant, equipment and mine development, net	5,214.2
Successor | U.S. Mining Division
Segment Reporting Information [Line Items]
Assets	3,997.5
Property, plant, equipment and mine development, net	3,339.1
Successor | Australian Mining Division
Segment Reporting Information [Line Items]
Assets	2,732.4
Property, plant, equipment and mine development, net	1,422.5
Successor | Trading and Brokerage
Segment Reporting Information [Line Items]
Assets	44.0
Property, plant, equipment and mine development, net	0.0
Successor | Corporate and Other
Segment Reporting Information [Line Items]
Assets	1,541.3
Property, plant, equipment and mine development, net	$ 452.6
Predecessor
Segment Reporting Information [Line Items]
Assets		$ 11,777.7
Property, plant, equipment and mine development, net		8,776.7
Predecessor | U.S. Mining Division
Segment Reporting Information [Line Items]
Assets		4,255.9
Property, plant, equipment and mine development, net		3,970.6
Predecessor | Australian Mining Division
Segment Reporting Information [Line Items]
Assets		5,402.2
Property, plant, equipment and mine development, net		3,905.8
Predecessor | Trading and Brokerage
Segment Reporting Information [Line Items]
Assets		128.7
Property, plant, equipment and mine development, net		0.2
Predecessor | Corporate and Other
Segment Reporting Information [Line Items]
Assets		1,990.9
Property, plant, equipment and mine development, net		$ 900.1

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Section S99
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
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-Name Accounting Standards Codification
-Topic 360
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