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MINING INTERESTS (Details 1) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Mining Interests [Line Items]    
Property, plant and equipment $ 1,853.4 $ 3,200.4
New Afton [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 656.0 785.5
Mesquite [Member]    
Mining Interests [Line Items]    
Property, plant and equipment   236.2
Cerro San Pedro [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 0.0 [1] 0.6
Rainy River [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 853.9 1,621.4
Blackwater [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 340.3 552.1
Other [Member]    
Mining Interests [Line Items]    
Property, plant and equipment [2] 3.2 4.6
Non-depletable [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 366.5 560.9
Non-depletable [Member] | New Afton [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 26.1 22.9
Non-depletable [Member] | Mesquite [Member]    
Mining Interests [Line Items]    
Property, plant and equipment   0.0
Non-depletable [Member] | Cerro San Pedro [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 0.0 [1] 0.0
Non-depletable [Member] | Rainy River [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 14.3 0.5
Non-depletable [Member] | Blackwater [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 326.1 537.5
Non-depletable [Member] | Other [Member]    
Mining Interests [Line Items]    
Property, plant and equipment [2] 1.1 1.1
Plant and Equipment [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 812.9 965.7
Plant and Equipment [Member] | New Afton [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 191.6 225.7
Plant and Equipment [Member] | Mesquite [Member]    
Mining Interests [Line Items]    
Property, plant and equipment   83.5
Plant and Equipment [Member] | Cerro San Pedro [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 0.0 [1] 0.0
Plant and Equipment [Member] | Rainy River [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 605.0 633.6
Plant and Equipment [Member] | Blackwater [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 14.2 14.6
Plant and Equipment [Member] | Other [Member]    
Mining Interests [Line Items]    
Property, plant and equipment [2] 2.1 3.5
Construction in Progress [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 127.2 57.0
Construction in Progress [Member] | New Afton [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 16.4 15.1
Construction in Progress [Member] | Mesquite [Member]    
Mining Interests [Line Items]    
Property, plant and equipment   2.7
Construction in Progress [Member] | Cerro San Pedro [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 0.0 [1] 0.0
Construction in Progress [Member] | Rainy River [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 110.8 39.2
Construction in Progress [Member] | Blackwater [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 0.0 0.0
Construction in Progress [Member] | Other [Member]    
Mining Interests [Line Items]    
Property, plant and equipment [2] 0.0 0.0
Depletable [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 545.7 1,615.7
Depletable [Member] | New Afton [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 421.9 521.8
Depletable [Member] | Mesquite [Member]    
Mining Interests [Line Items]    
Property, plant and equipment   150.0
Depletable [Member] | Cerro San Pedro [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 0.0 [1] 0.6
Depletable [Member] | Rainy River [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 123.8 948.1
Depletable [Member] | Blackwater [Member]    
Mining Interests [Line Items]    
Property, plant and equipment 0.0 0.0
Depletable [Member] | Other [Member]    
Mining Interests [Line Items]    
Property, plant and equipment [2] $ 0.0 $ 0.0
[1] Cerro San Pedro transitioned to the reclamation phase of its mine life cycle on December 31, 2018. As a result, Cerro San Pedro’s mining interests are fully amortized as at December 31, 2018.
[2] Other includes corporate balances and exploration properties.