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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 |

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