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RECLAMATION AND CLOSURE COST OBLIGATIONS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
RECLAMATION AND CLOSURE COST OBLIGATIONS    
Beginning Balance $ 92.6 $ 124.1
Reclamation and closure costs paid (8.8) (1.2)
Unwinding of discount 2.7 2.4
Revisions to expected cash flows 16.0 (6.3)
Foreign exchange movement 4.5 (6.4)
Less: amounts reclassified as held for sale and sold   (20.0)
Ending Balance 107.0 92.6
Less: current portion of closure costs (12.3) (6.5)
Non-current portion of closure costs 94.7 86.1
Rainy River    
RECLAMATION AND CLOSURE COST OBLIGATIONS    
Beginning Balance 53.6 63.4
Reclamation and closure costs paid (0.2) (0.3)
Unwinding of discount 1.1 1.5
Revisions to expected cash flows 9.7 (6.1)
Foreign exchange movement 2.8 (4.9)
Less: amounts reclassified as held for sale and sold   0.0
Ending Balance 67.0 53.6
Less: current portion of closure costs (1.4) 0.0
Non-current portion of closure costs 65.6 53.6
New Afton    
RECLAMATION AND CLOSURE COST OBLIGATIONS    
Beginning Balance 10.7 11.6
Reclamation and closure costs paid 0.0 0.0
Unwinding of discount 0.2 0.2
Revisions to expected cash flows 6.4 (0.3)
Foreign exchange movement 0.7 (0.8)
Less: amounts reclassified as held for sale and sold   0.0
Ending Balance 18.0 10.7
Less: current portion of closure costs 0.0 0.0
Non-current portion of closure costs 18.0 10.7
Mesquite [Member]    
RECLAMATION AND CLOSURE COST OBLIGATIONS    
Beginning Balance 0.0 20.5
Reclamation and closure costs paid 0.0 0.0
Unwinding of discount 0.0 0.4
Revisions to expected cash flows 0.0 (0.9)
Foreign exchange movement 0.0 0.0
Less: amounts reclassified as held for sale and sold   (20.0)
Ending Balance 0.0 0.0
Less: current portion of closure costs 0.0 0.0
Non-current portion of closure costs 0.0 0.0
Cerro San Pedro    
RECLAMATION AND CLOSURE COST OBLIGATIONS    
Beginning Balance 20.0 19.2
Reclamation and closure costs paid (8.6) (0.9)
Unwinding of discount 1.2 0.1
Revisions to expected cash flows (0.6) 1.5
Foreign exchange movement 0.6 0.1
Less: amounts reclassified as held for sale and sold   0.0
Ending Balance 12.6 20.0
Less: current portion of closure costs (10.9) (6.5)
Non-current portion of closure costs 1.7 13.5
Blackwater    
RECLAMATION AND CLOSURE COST OBLIGATIONS    
Beginning Balance 8.3 9.4
Reclamation and closure costs paid 0.0 0.0
Unwinding of discount 0.2 0.2
Revisions to expected cash flows 0.5 (0.5)
Foreign exchange movement 0.4 (0.8)
Less: amounts reclassified as held for sale and sold   0.0
Ending Balance 9.4 8.3
Less: current portion of closure costs 0.0 0.0
Non-current portion of closure costs $ 9.4 $ 8.3