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Acquisition of Marshall Mine - Additional Information (Details) $ in Millions	Sep. 30, 2020 USD ($)
Business Acquisition [Line Items]
Reclamation reimbursements	$ 10.2
Marshall Mine
Business Acquisition [Line Items]
Membership interest	100.00%
Capped cost	$ 19.7
Direct cost	$ 3.6
Estimated reclamation period	10 years
Term of contract	15 years
Marshall Mine | Cabot
Business Acquisition [Line Items]
Reclamation reimbursements	$ 10.2
Term of contract	13 years

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- Definition

Estimated Reclamation Period

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- Definition

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- Definition

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- Definition

Reclamation Reimbursements

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Details

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