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Shareholders' equity - Common Shares (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Shareholders' equity          
At-the-market equity offering | shares 474,900   909,900    
Balance at the beginning period     $ 5,390,700,000    
At-the-market equity offering     112,300,000    
Amount of Acquisition of Salares Norte       $ 27,000,000  
Amount of Exercise of stock options     6,000,000 2,500,000  
Dividend reinvestment plan $ (10,100,000) $ (12,300,000) (21,000,000) $ (22,300,000)  
Balance at the ending period $ 5,531,900,000   $ 5,531,900,000   $ 5,390,700,000
Common shares          
Shareholders' equity          
Shares issued | shares 190,588,491   190,588,491    
Shares, par value (dollars per share) | $ / shares $ 0   $ 0    
Preferred shares          
Shareholders' equity          
Shares issued | shares 0   0    
Share Capital (Note 15)          
Shareholders' equity          
Number of shares outstanding at beginning of period | shares     189,381,388 186,692,481 186,692,481
At-the-market equity offering | shares     909,900   1,433,400
Acquisition of Salares Norte         366,499
Exercise of stock options | shares     124,404   283,863
Vesting of restricted share units | shares         46,375
Dividend reinvestment plan | shares     172,799   558,770
Number of shares outstanding at end of period | shares 190,588,491   190,588,491   189,381,388
Balance at the beginning period     $ 5,390,700,000 $ 5,158,300,000 $ 5,158,300,000
At-the-market equity offering     112,300,000   136,000,000
Amount of Acquisition of Salares Norte       27,000,000 27,000,000
Amount of Exercise of stock options     7,900,000 3,300,000 17,300,000
Amount of Vesting of restricted share units         3,300,000
Dividend reinvestment plan     (21,000,000) $ (22,300,000) (48,800,000)
Balance at the ending period $ 5,531,900,000   $ 5,531,900,000   $ 5,390,700,000