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Share-based compensation plans - Share options number and weighted average price (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares
Number And Weighted Average Exercise Prices Of Share Options [Abstract] |  |  |  |
Beginning of year | 8,820,805 | 8,324,666 |  |
Options granted | 886,740 | 1,473,430 |  |
Options forfeited | (270,025) | (315,340) |  |
Options expired | (815,423) | (661,951) |  |
Options exercised | (5,000) | 0 |  |
End of year | 8,617,097 | 8,820,805 |  |
Weighted average exercisable price - beginning of year | $ / shares | $ 19.75 | $ 22.19 |  |
Weighted average exercisable price for options granted | $ / shares | 15.27 | 11.32 |  |
Weighted average exercisable price for options forfeited | $ / shares | 22.59 | 25.43 |  |
Weighted average exercisable price for options expired | $ / shares | 38.43 | 28.9 |  |
Weighted average exercise price for options exercised | $ / shares | 16.38 | 0 |  |
Weighted average exercisable price - end of year | $ / shares | $ 17.44 | $ 19.75 |  |
Exercisable |  |  | 6,290,380 | 6,007,557
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Number Of Outstanding Share Options | 8,617,097 | 8,820,805 | 8,617,097 | 8,820,805
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement | $ / shares | $ 17.44 | $ 22.19 | $ 17.44 | $ 19.75
Number Of Share Options Exercisable In Sharebased Payment Arrangement |  |  | 6,290,380 | 6,007,557
Options exercisable - Weighted average exercisable price | $ / shares |  |  | $ 18.9 | $ 22.83
$11.32 - 15.83 [member] |  |  |  |
Number And Weighted Average Exercise Prices Of Share Options [Abstract] |  |  |  |
End of year | 3,733,210 |  |  |
Weighted average exercisable price - end of year | $ / shares | $ 13.5 |  |  |
Exercisable |  |  | 1,406,493 |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Number Of Outstanding Share Options | 3,733,210 |  | 3,733,210 |
Options outstanding - Weighted average remaining life | 5 years 8 months 12 days |  |  |
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement | $ / shares | $ 13.5 |  | $ 13.5 |
Number Of Share Options Exercisable In Sharebased Payment Arrangement |  |  | 1,406,493 |
Options exercisable - Weighted average exercisable price | $ / shares |  |  | $ 13.52 |
$15.84 - 26.81 [member] |  |  |  |
Number And Weighted Average Exercise Prices Of Share Options [Abstract] |  |  |  |
End of year | 4,883,887 |  |  |
Weighted average exercisable price - end of year | $ / shares | $ 20.45 |  |  |
Exercisable |  |  | 4,883,887 |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Number Of Outstanding Share Options | 4,883,887 |  | 4,883,887 |
Options outstanding - Weighted average remaining life | 1 year 10 months 24 days |  |  |
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement | $ / shares | $ 20.45 |  | $ 20.45 |
Number Of Share Options Exercisable In Sharebased Payment Arrangement |  |  | 4,883,887 |
Options exercisable - Weighted average exercisable price | $ / shares |  |  | $ 20.45 |

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