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INCOME AND MINING TAXES - Income tax recovery (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
INCOME AND MINING TAXES    
Loss before taxes $ (73.9) $ (1,096.0)
Canadian federal and provincial income tax rates 26.30% 26.30%
Income tax recovery based on above rates $ (19.4) $ (288.2)
INCREASE (DECREASE) DUE TO    
Permanent differences (0.1) 58.3
Different statutory tax rates on earnings of foreign subsidiaries 0.0 (4.1)
Foreign exchange on non-monetary assets and liabilities 0.2 0.4
Other foreign exchange differences 3.7 (3.2)
Prior years' adjustments relating to tax provision and tax returns (5.2) 4.7
Canadian mining tax (2.5) 26.6
Change in unrecognized deferred tax assets 22.9 210.0
Sale of Peak and Mesquite 0.0 (15.1)
Other 0.0 0.2
Total income tax expense (recovery) $ (0.4) $ (10.4)