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INCOME TAXES - Reconciliation Of Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Abstract]    
Earnings (loss) before income taxes $ (319.6) $ 98.8
Income tax provision - 26.5% (84.7) 26.2
Increase (reduction) in income taxes resulting from:    
Earnings in foreign jurisdictions subject to a different tax rate than 26.5% (34.8) (9.0)
Permanent items that are not included in income / losses for tax purposes:    
Non-deductible expenses (2.5) 3.4
Income/(losses) not recognized for tax purposes (5.0) 5.7
Tax provisions not based on legal entity income or losses for the year:    
Provincial mining duty tax 0.3 3.0
Non-resident withholding tax 12.1 2.7
Under/(over) tax provisions (2.2) (0.5)
Other 1.9 (1.0)
Other adjustments:    
Unrecognized recoveries in deferred tax provisions 39.0 25.1
Foreign exchange related to deferred income taxes 11.2 (12.1)
Other 0.2 0.6
Total income tax expense (recovery) $ (64.5) $ 44.1