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GENERAL AND ADMINSTRATIVE EXPENSES (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Analysis of income and expense [abstract]    
Salaries $ 22.8 $ 24.2
Directors' fees and expenses 1.1 1.1
Professional and consulting fees 8.3 5.2
Other administration costs 4.5 2.2
Share-based compensation 6.1 10.7
(Gain) loss on cash flow hedges (2.6) 1.8
Depreciation expense 1.8 1.6
General and administrative $ 42.0 $ 46.8