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Other Events (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)
Other Commercial Events [Line Items]
Mine Reclamation and Closing Liability, Noncurrent	$ 6.4	$ 6.4
Millennium Mine
Other Commercial Events [Line Items]
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	26.1	26.1
Wilkie Creek Mine
Other Commercial Events [Line Items]
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	$ 24.6	$ 24.6

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[Line Items] for Other Commercial Events [Table]

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Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
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Amount of a reclamation and mine closing liability that is associated with a legal obligation for the closure and reclamation of a mine including the removal of buildings, equipment, machinery and other physical remnants of mining, closure of tailings impoundments, leach pads and other mine features, and contouring, covering and revegetation of waste rock piles and other disturbed areas.

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-Publisher FASB
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-Topic 450
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