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IMPAIRMENT CHARGES AND ASSET DERECOGNITION - Property, plant and equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Accumulated depreciation, depletion, amortization and impairment
Impairment charges
Derecognition		$ 99.2
Bald Mountain
Impairment charges
Derecognition		49.3
Tax expense (recovery) on impairment charge		$ 13.1
Round Mountain
Impairment charges
Tax expense (recovery) on impairment charge	$ 41.8
Carrying amounts of property, plant and equipment	$ 569.5

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The decrease in property, plant and equipment resulting from derecognition.

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The carrying value of property, plant and equipment of the cash generating unit (CGU).

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The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to impairment reversal.

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