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Shareholders' equity - Common Shares (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
EquityInstruments
shares
Jan. 31, 2019
EquityInstruments
Shareholders' equity      
Number of shares outstanding at beginning of period | shares 189,381,388    
Number of shares outstanding at end of period | shares 190,956,476 189,381,388  
Balance at the beginning period $ 5,390.7    
At-the-market equity offering 133.7 $ 136.0  
Amount of Acquisition of Salares Norte   27.0  
Amount of Exercise of stock options 7.4 13.2  
Dividend reinvestment plan (42.3) (48.8)  
Balance at the ending period $ 5,580.1 $ 5,390.7  
Common shares      
Shareholders' equity      
Shares issued | shares 190,956,476    
Shares, par value (dollars per share) | $ / shares $ 0    
Common shares | Salares Norte Royalty Interest      
Shareholders' equity      
Acquisition of Salares Norte | EquityInstruments     366,499
Preferred shares      
Shareholders' equity      
Shares issued | shares 0    
Share Capital (Note 17)      
Shareholders' equity      
Number of shares outstanding at beginning of period | shares 189,381,388 186,692,481  
At-the-market equity offering | shares 1,054,800 1,433,400  
Acquisition of Salares Norte | EquityInstruments   366,499  
Exercise of stock options | shares 150,482 283,863  
Vesting of restricted share units | shares 42,328 46,375  
Dividend reinvestment plan | shares 327,478 558,770  
Number of shares outstanding at end of period | shares 190,956,476 189,381,388  
Balance at the beginning period $ 5,390.7 $ 5,158.3  
At-the-market equity offering 133.7 136.0  
Amount of Acquisition of Salares Norte   27.0  
Amount of Exercise of stock options 9.7 17.3  
Amount of Vesting of restricted share units 3.7 3.3  
Dividend reinvestment plan (42.3) (48.8)  
Balance at the ending period $ 5,580.1 $ 5,390.7