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Share capital - Stock Options Rollforward (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2018
CAD ($)
shares
Dec. 31, 2017
CAD ($)
shares
Disclosure of share capital, reserves and other equity interest [Abstract]    
Number of outstanding options, beginning of year (in shares) | shares 57,602 50,410
Number of options granted (in shares) | shares 25,380 22,968
Number of options exercised (in shares) | shares (12,347) (13,708)
Number of options forfeited (in shares) | shares (3,003) (2,068)
Number of outstanding options, ending of year (in shares) | shares 67,632 57,602
Weighted-average exercise price, beginning of year (in Cdn.$per share) | $ $ 2.70 $ 2.24
Weighted average exercise price, options granted (in Cdn.$per share) | $ 3.35 3.65
Weighted average exercise price, options exercised (in Cdn.$per share) | $ 2.40 2.54
Weighted average exercise price, options forfeited (in Cdn.$per share) | $ 3.50 3.27
Weighted-average exercise price, end of year (in Cdn.$per share) | $ $ 2.96 $ 2.70