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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liability (asset)	$ (477.2)	$ (461.2)
Closure and decommissioning costs
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liability (asset)	13.1	33.9
Tax losses, resource pools and mining tax credits
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liability (asset)	109.4	84.6
Mineral properties, plant, and equipment
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liability (asset)	(630.1)	(636.0)
Other temporary differences and provisions
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liability (asset)	$ 30.4	$ 56.3