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Share-based payments - Outstanding Stock Options (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 shares $ / shares | Jun. 30, 2020 shares $ / shares
NUMBER OF OPTIONS |  |
Outstanding, beginning of period (in shares) | shares | 12,825,541 |
Granted (in shares) | shares | 3,410,150 |
Exercised (in shares) | shares | (419,546) |
Forfeited (in shares) | shares | (41,845) |
Outstanding, end of period (in shares) | shares | 15,774,300 |
Exercisable, end of period (in shares) | shares |  | 5,299,256
WEIGHTED AVERAGE EXERCISE PRICE ($) |  |
Outstanding, beginning of period (CAD per share) | $ 57 |
Granted (CAD per share) | 65 |
Exercised (CAD per share) | 53 |
Forfeited (CAD per share) | 60 |
Outstanding, end of period (CAD per share) | 57 | $ 59
Exercisable, end of period (CAD per share) |  | $ 58
Weighted average share price, share options exercised (CAD per share) | $ 64 |

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