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Share-based complesation plans - Share options number and weighted average price (Details) | 12 Months Ended |  |
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Dec. 31, 2018 CAD ($) shares | Dec. 31, 2017 CAD ($) shares | Dec. 31, 2018 CAD ($) shares yr | Dec. 31, 2017 CAD ($) shares
Number And Weighted Average Exercise Prices Of Share Options [Abstract] |  |  |  |
Beginning of year | 8,324,666 | 8,020,311 |  |
Options granted | 1,473,430 | 1,373,040 |  |
Options forfeited | (315,340) | (564,423) |  |
Options expired | (661,951) | (504,052) |  |
Options exercised | 0 | (210) |  |
End of year | 8,820,805 | 8,324,666 |  |
Weighted average exercisable price - beginning of year | $ | $ 22.19 | $ 23.61 |  |
Weighted average exercisable price for options granted | $ | 11.32 | 14.7 |  |
Weighted average exercisable price for options forfeited | $ | 25.43 | 26.49 |  |
Weighted average exercisable price for options expired | $ | 28.9 | 19.5 |  |
Weighted average exercise price for options exercised | $ | 0 | 19.37 |  |
Weighted average exercisable price - end of year | $ | $ 19.75 | $ 22.19 |  |
Exercisable |  |  | 6,007,557 | 5,809,077
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Number Of Outstanding Share Options | 8,324,666 | 8,324,666 | 8,820,805 | 8,324,666
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement | $ | $ 19.75 | $ 23.61 | $ 19.75 | $ 22.19
Number Of Share Options Exercisable In Sharebased Payment Arrangement |  |  | 6,007,557 | 5,809,077
Options exercisable - Weighted average exercisable price | $ |  |  | $ 22.83 | $ 24.95
$11.32 - 17.84 [member] |  |  |  |
Number And Weighted Average Exercise Prices Of Share Options [Abstract] |  |  |  |
End of year | 4,119,810 |  |  |
Weighted average exercisable price - end of year | $ | $ 14.01 |  |  |
Exercisable |  |  | 1,306,562 |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Number Of Outstanding Share Options | 4,119,810 |  | 4,119,810 |
Options outstanding - Weighted average remaining life | yr |  |  | 5.8 |
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement | $ | $ 14.01 |  | $ 14.01 |
Number Of Share Options Exercisable In Sharebased Payment Arrangement |  |  | 1,306,562 |
Options exercisable - Weighted average exercisable price | $ |  |  | $ 15.79 |
$17.85 - 39.53 [member] |  |  |  |
Number And Weighted Average Exercise Prices Of Share Options [Abstract] |  |  |  |
End of year | 4,700,995 |  |  |
Weighted average exercisable price - end of year | $ | $ 24.79 |  |  |
Exercisable |  |  | 4,700,995 |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Number Of Outstanding Share Options | 4,700,995 |  | 4,700,995 |
Options outstanding - Weighted average remaining life | yr |  |  | 2 |
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement | $ | $ 24.79 |  | $ 24.79 |
Number Of Share Options Exercisable In Sharebased Payment Arrangement |  |  | 4,700,995 |
Options exercisable - Weighted average exercisable price | $ |  |  | $ 24.79 |

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