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Asset Retirement Obligations (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2022
Segment Reporting Information [Line Items]
Cash received	$ 2.2
Estimated asset retirement obligation	1.9
Gain on the assumption of third-party asset retirement obligation	$ 0.3
Marshall Mine
Segment Reporting Information [Line Items]
Membership interest (percent)	100.00%
Bellaire
Segment Reporting Information [Line Items]
Initial investment amount			$ 5.0
Fair value of trust assets	$ 11.2	$ 12.3

X

- Definition

Asset Retirement Obligation, Legally Restricted Assets, Initial Investment Amount

+ References

No definition available.

+ Details

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X

- Definition

Fair Market Value Of The Asset Retirement Obligation Assumed From A Third-Party

+ References

No definition available.

+ Details

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X

- Definition

Gain On The Assumption Of Third-Party Asset Retirement Obligation

+ References

No definition available.

+ Details

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X

- Definition

Proceeds As A Result Of Assuming Third-Party Asset Retirement Obligation

+ References

No definition available.

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X

- Definition

Carrying amount of an asset that is legally restricted for purposes of settling an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

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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

No definition available.

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- Details

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- Details

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