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Acquisition of Shoal Creek Mine Purchase Accounting (Details) - Successor - Shoal Creek $ in Millions	Dec. 03, 2018 USD ($)
Business Acquisition [Line Items]
Inventories	$ 39.7
Property, plant, equipment and mine development	364.7
Current liabilities	(6.5)
Asset retirement obligations	(10.5)
Total purchase price	$ 387.4

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Business Acquisition, Price of Acquired Entity

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- Definition

Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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- Definition

The amount of inventory recognized as of the acquisition date.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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-Name Accounting Standards Codification
-Topic 805
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-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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The amount of property, plant, and equipment recognized as of the acquisition date.

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
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