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INVESTMENT IN ASSOCIATE (Details)
$ / shares in Units, shares in Millions, $ in Millions, $ in Millions
 12 Months Ended
Jan. 28, 2021
USD ($)
shares
Jan. 28, 2021
CAD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of associates [line items]          
Investment in associate     $ 0.0 $ 9.0 $ 10.0
Investments In Subsidiaries, Joint Ventures And Associates, Foreign Exchange Gain (Loss)     (0.7) 0.6  
Share of net loss from investment in associate, net of income taxes     (0.6) $ (1.6)  
Investments in subsidiaries, purchase of additional shares reported in separate financial statements     1.7    
Sale of investment     $ (9.4)    
INV Metals          
Disclosure of associates [line items]          
Proportion of ownership interest in associate 35.50% 35.50% 0.00% 35.50%  
Additional associate shares acquired | shares 4.8 4.8      
Additional associate shares purchased (in cad per share) | $ / shares   $ 0.45      
Purchase of additional shares of associate $ 1.7 $ 2.2