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Share-based compensation plans - Share options number and weighted average price (Details) | 12 Months Ended |  |
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Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares
Number And Weighted Average Exercise Prices Of Share Options [Abstract] |  |  |  |
Beginning of year | 8,617,097 | 8,820,805 |  |
Options granted | 0 | 886,740 |  |
Options forfeited | (81,991) | (270,025) |  |
Options expired | (1,911,558) | (815,423) |  |
Options exercised | (465,009) | (5,000) |  |
End of year | 6,158,539 | 8,617,097 |  |
Weighted average exercisable price - beginning of year | $ / shares | $ 17.44 | $ 19.75 |  |
Weighted average exercisable price for options granted | $ / shares | 0 | 15.27 |  |
Weighted average exercisable price for options forfeited | $ / shares | 22.22 | 22.59 |  |
Weighted average exercisable price for options expired | $ / shares | 20.14 | 38.43 |  |
Weighted average exercise price for options exercised | $ / shares | 11.56 | 16.38 |  |
Weighted average exercisable price - end of year | $ / shares | $ 16.98 | $ 17.44 |  |
Exercisable |  |  | 5,076,226 | 6,290,380
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Number Of Outstanding Share Options | 6,158,539 | 8,617,097 | 6,158,539 | 8,617,097
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement | $ / shares | $ 16.98 | $ 19.75 | $ 16.98 | $ 17.44
Number Of Share Options Exercisable In Sharebased Payment Arrangement |  |  | 5,076,226 | 6,290,380
Options exercisable - Weighted average exercisable price | $ / shares |  |  | $ 17.73 | $ 18.9
$11.32 - 15.83 [member] |  |  |  |
Number And Weighted Average Exercise Prices Of Share Options [Abstract] |  |  |  |
End of year | 3,060,721 |  |  |
Weighted average exercisable price - end of year | $ / shares | $ 13.72 |  |  |
Exercisable |  |  | 1,978,408 |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Number Of Outstanding Share Options | 3,060,721 |  | 3,060,721 |
Options outstanding - Weighted average remaining life | 5 years |  |  |
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement | $ / shares | $ 13.72 |  | $ 13.72 |
Number Of Share Options Exercisable In Sharebased Payment Arrangement |  |  | 1,978,408 |
Options exercisable - Weighted average exercisable price | $ / shares |  |  | $ 13.85 |
$15.84 - 26.81 [member] |  |  |  |
Number And Weighted Average Exercise Prices Of Share Options [Abstract] |  |  |  |
End of year | 3,097,818 |  |  |
Weighted average exercisable price - end of year | $ / shares | $ 20.21 |  |  |
Exercisable |  |  | 3,097,818 |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Number Of Outstanding Share Options | 3,097,818 |  | 3,097,818 |
Options outstanding - Weighted average remaining life | 1 year 9 months 18 days |  |  |
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement | $ / shares | $ 20.21 |  | $ 20.21 |
Number Of Share Options Exercisable In Sharebased Payment Arrangement |  |  | 3,097,818 |
Options exercisable - Weighted average exercisable price | $ / shares |  |  | $ 20.21 |

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