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INCOME AND MINING TAXES (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Income and mining taxes [Line Items]      
Adjustments for current tax of prior periods   $ 0.0 $ 0.1
Current tax expense (income) and adjustments for current tax of prior periods   4.1 3.8
Adjustments for deferred tax of prior year   4.7 (1.3)
Deferred tax expense (income) $ 1.9 (29.3) (88.4)
Total income tax expense (recovery)   (25.2) (84.6)
Canada [Member]      
Income and mining taxes [Line Items]      
Current tax expense (income)   4.2 2.8
Deferred tax expense (income)   (34.0) (87.7)
Foreign [Member]      
Income and mining taxes [Line Items]      
Current tax expense (income)   (0.1) 0.9
Deferred tax expense (income)   $ 0.0 $ 0.6