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ACQUISITIONS - Disposal of interest (Details)
shares in Millions, $ in Millions, $ in Millions
12 Months Ended
Nov. 03, 2017
CAD ($)
Nov. 03, 2017
USD ($)
Sep. 18, 2017
Jun. 14, 2017
CAD ($)
item
shares
Jun. 14, 2017
USD ($)
item
shares
Jun. 09, 2017
USD ($)
May 18, 2017
Mar. 28, 2017
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Acquisitions                    
Gross cash proceeds                   $ 269.6
Reversal of impairment charges                   97.0
Gains on disposals of investments           $ 12.7     $ 2.1 55.2
Goldcorp Inc. ("Goldcorp")                    
Acquisitions                    
Gross cash proceeds           $ 260.0        
Royalty percentage           1.25%        
Percentage of gross revenues           25.00%        
Foregoing revenue           $ 10.0        
White Gold Corp                    
Acquisitions                    
Gross cash proceeds       $ 10.0 $ 7.6          
Number of shares received | shares       17.5 17.5          
Percentage of common shares       19.90% 19.90%          
Deferred payments       $ 15.0 $ 11.4          
Number of equal payments | item       3 3          
Amount of equal payments       $ 5.0 $ 3.8          
Losses on disposals of investments         $ 1.7          
Integra                    
Acquisitions                    
Period for non-interest bearing promissory note due 18 months 18 months                
Total consideration $ 7.2 $ 5.6                
Percentage of common shares 9.90% 9.90%                
Percentage of net smelter return royalty 2.50% 2.50%                
Maximum percentage of net smelter return royalty 1.00% 1.00%                
Accumulated royalty payments $ 10.0 $ 7.8                
Gains on disposals of investments   $ 44.2                
Barrick | Goldcorp Inc. ("Goldcorp")                    
Acquisitions                    
Contingent payment           20.0        
Cerro Casale                    
Acquisitions                    
Reversal of impairment charges           97.0        
Gains on disposals of investments                   12.7
Cerro Casale | Goldcorp Inc. ("Goldcorp")                    
Acquisitions                    
Interest disposed (percentage)               25.00%    
Contingent payment           40.0        
Quebrada Seca exploration project | Goldcorp Inc. ("Goldcorp")                    
Acquisitions                    
Interest disposed (percentage)               100.00%    
Gross cash proceeds           $ 20.0        
White Gold                    
Acquisitions                    
Losses on disposals of investments                   1.7
White Gold | White Gold Corp                    
Acquisitions                    
Interest disposed (percentage)             100.00%      
DeLamar                    
Acquisitions                    
Gains on disposals of investments                   $ 44.2
DeLamar | Integra                    
Acquisitions                    
Interest disposed (percentage)     100.00%