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OTHER ASSETS (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]    
Non-current portion of ore stockpiles (Note 18) $ 167.3 $ 149.4
Income tax recoverable and installments 6.9 2.8
Tax credits recoverable 70.6 77.4
Advances, deposits and prepaids 67.4 64.1
Other 4.1 5.0
Other non-financial assets 316.3 298.7
Current 113.3 96.1
Non-current $ 203.0 $ 202.6