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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 |

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