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Segment Information - Reconciliation to Property, Plant, Equipment, and Mine Development (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Additions to property, plant, equipment and mine development	$ 116.2	$ 98.7	$ 280.8	$ 265.7
Corporate and Other (1)
Segment Reporting Information [Line Items]
Additions to property, plant, equipment and mine development	1.0	2.1	2.0	3.6
Total Segment Excluding Corporate and Other Operating Segment
Segment Reporting Information [Line Items]
Additions to property, plant, equipment and mine development excluding corporate and other segment	$ 115.2	$ 96.6	$ 278.8	$ 262.1

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- Definition

Additions to property, plant, equipment and mine development excluding corporate and other segment

+ References

No definition available.

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- Definition

Amount of expenditure for addition to long-lived assets included in determination of segment assets by chief operating decision maker (CODM) or otherwise regularly provided to CODM. Excludes expenditure for addition to financial instrument, long-term customer relationship of financial institution, mortgage and other servicing rights, deferred policy acquisition cost, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 48
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-48

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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
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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.

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