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SHARE CAPITAL - Share-based payment expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share capital    
Share-based payment expenses $ 2.7 $ 0.7
Stock Options [Member]    
Share capital    
Share-based payment expenses 0.5 1.4
Performance Share Units [Member]    
Share capital    
Share-based payment expenses 0.3 0.1
Restricted Share Unit [Member]    
Share capital    
Share-based payment expenses 1.1 (0.3)
Deferred share units [Member]    
Share capital    
Share-based payment expenses 0.8 (0.8)
Common Shares Under First Nations Agreement [Member]    
Share capital    
Share-based payment expenses $ 0.0 $ 0.3