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RECLAMATION AND CLOSURE COST OBLIGATIONS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reclamation and closure cost obligations [Line Items]    
Beginning Balance $ 124.1 $ 81.9
Reclamation and closure costs paid (1.2) (1.4)
Unwinding of discount 2.4 1.7
Revisions to expected cash flows (6.3) 55.2
Foreign exchange movement (6.4) 4.9
Less: amounts reclassified as held for sale 32.0 1.9
Ending Balance 92.6 124.1
Less: current portion of closure costs (Note 5) (6.5) (2.6)
Non-current portion of closure costs 86.1 121.5
New Afton [Member]    
Disclosure of reclamation and closure cost obligations [Line Items]    
Beginning Balance 11.6 7.6
Reclamation and closure costs paid 0.0 (0.2)
Unwinding of discount 0.2 0.2
Revisions to expected cash flows (0.3) 3.2
Foreign exchange movement (0.8) 0.8
Less: amounts reclassified as held for sale 0.0 0.0
Ending Balance 10.7 11.6
Less: current portion of closure costs (Note 5) 0.0 0.0
Non-current portion of closure costs 10.7 11.6
Mesquite [Member]    
Disclosure of reclamation and closure cost obligations [Line Items]    
Beginning Balance 20.5 13.6
Reclamation and closure costs paid 0.0 0.0
Unwinding of discount 0.4 0.3
Revisions to expected cash flows (0.9) 6.6
Foreign exchange movement 0.0 0.0
Less: amounts reclassified as held for sale (20.0) 0.0
Ending Balance 0.0 20.5
Less: current portion of closure costs (Note 5)   (0.2)
Non-current portion of closure costs 0.0 20.3
Peak Mines [Member]    
Disclosure of reclamation and closure cost obligations [Line Items]    
Beginning Balance 0.0 13.7
Reclamation and closure costs paid 0.0 (0.1)
Unwinding of discount 0.0 0.4
Revisions to expected cash flows 0.0 3.1
Foreign exchange movement 0.0 1.1
Less: amounts reclassified as held for sale 0.0 (18.2)
Ending Balance 0.0 0.0
Less: current portion of closure costs (Note 5) 0.0 0.0
Non-current portion of closure costs 0.0 0.0
Cerro San Pedro [Member]    
Disclosure of reclamation and closure cost obligations [Line Items]    
Beginning Balance 19.2 18.1
Reclamation and closure costs paid (0.9) (1.0)
Unwinding of discount 0.1 0.2
Revisions to expected cash flows 1.5 1.2
Foreign exchange movement 0.1 0.7
Less: amounts reclassified as held for sale 0.0 0.0
Ending Balance 20.0 19.2
Less: current portion of closure costs (Note 5) (6.5) (2.4)
Non-current portion of closure costs 13.5 16.8
Rainy River [Member]    
Disclosure of reclamation and closure cost obligations [Line Items]    
Beginning Balance 63.4 20.0
Reclamation and closure costs paid (0.3) 0.0
Unwinding of discount 1.5 0.4
Revisions to expected cash flows (6.1) 41.4
Foreign exchange movement (4.9) 1.6
Less: amounts reclassified as held for sale 0.0 0.0
Ending Balance 53.6 63.4
Less: current portion of closure costs (Note 5) 0.0 0.0
Non-current portion of closure costs 53.6 63.4
Blackwater [Member]    
Disclosure of reclamation and closure cost obligations [Line Items]    
Beginning Balance 9.4 8.9
Reclamation and closure costs paid 0.0 (0.1)
Unwinding of discount 0.2 0.2
Revisions to expected cash flows (0.5) (0.3)
Foreign exchange movement (0.8) 0.7
Less: amounts reclassified as held for sale 0.0 0.0
Ending Balance 8.3 9.4
Less: current portion of closure costs (Note 5) 0.0 0.0
Non-current portion of closure costs $ 8.3 $ 9.4