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Impairment charge (Tables)
12 Months Ended
Dec. 31, 2021
Disclosure of impairment of assets [Abstract]  
Components of Impairment Charge
The Components of the impairment charge is as follows:December 31,
2021
Current assets$5.5 
Plant and equipment0.3 
Mineral property - non-depletable142.4 
Exploration and evaluation76.1 
Pre-tax impairment charge224.3 
Deferred tax liability(10.5)
After-tax impairment charge$213.8