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Shareholders' equity - Common Shares (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Jan. 31, 2019
USD ($)
Shareholders' equity      
Number of shares outstanding at beginning of period | shares 186,692,481    
Number of shares outstanding at end of period | shares 189,381,388 186,692,481  
Balance at the beginning period $ 5,158,300,000    
At-the-market equity offering 136,000,000    
Amount ofAcquisition of Salares Norte 27,000,000    
Amount of Exercise of stock options 13,200,000 $ 4,200,000  
Dividend reinvestment plan 48,800,000 41,700,000  
Balance at the ending period $ 5,390,700,000 $ 5,158,300,000  
Common shares      
Shareholders' equity      
Shares issued | shares 189,381,388    
Shares, par value (dollars per share) | $ / shares $ 0    
Common shares | Salares Norte Royalty Interest      
Shareholders' equity      
Acquisition of Salares Norte     366,499
Preferred shares      
Shareholders' equity      
Shares issued | shares 0    
Share Capital (Note 19)      
Shareholders' equity      
Number of shares outstanding at beginning of period | shares 186,692,481 185,930,331  
At-the-market equity offering | shares 1,433,400    
Acquisition of Salares Norte 366,499    
Exercise of stock options | shares 283,863 94,018  
Vesting of restricted share units | shares 46,375 52,882  
Dividend reinvestment plan | shares 558,770 615,250  
Number of shares outstanding at end of period | shares 189,381,388 186,692,481  
Balance at the beginning period $ 5,158,300,000 $ 5,107,800,000  
At-the-market equity offering 136,000,000    
Amount ofAcquisition of Salares Norte 27,000,000    
Amount of Exercise of stock options 17,300,000 5,500,000  
Amount of Vesting of restricted share units 3,300,000 3,300,000  
Dividend reinvestment plan 48,800,000 41,700,000  
Balance at the ending period $ 5,390,700,000 $ 5,158,300,000