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Share-based compensation - Disclosure of range of exercise prices of outstanding share options (Details) | Dec. 31, 2019 CAD ($) share year | Dec. 31, 2018 CAD ($) share | Dec. 31, 2017 CAD ($) share
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Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | share | 4,939,344 | 4,305,980 | 3,537,123
Weighted average exercise price of share options outstanding in share-based payment arrangement | $ 14.40 | $ 14.49 | $ 14.90
Weighted average remaining contractual life of outstanding share options | year | 2.8 |  |
Number of share options exercisable in share-based payment arrangement | share | 2,988,713 | 2,720,879 |
Weighted average exercise price of share options exercisable in share-based payment arrangement | $ 14.87 | $ 14.72 |
6.94 - 9.98 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | share | 212,708 |  |
Weighted average exercise price of share options outstanding in share-based payment arrangement | $ 7.80 |  |
Weighted average remaining contractual life of outstanding share options | year | 0.7 |  |
Number of share options exercisable in share-based payment arrangement | share | 212,708 |  |
Weighted average exercise price of share options exercisable in share-based payment arrangement | $ 7.80 |  |
10.58 - 12.97 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | share | 1,187,408 |  |
Weighted average exercise price of share options outstanding in share-based payment arrangement | $ 12.65 |  |
Weighted average remaining contractual life of outstanding share options | year | 4.2 |  |
Number of share options exercisable in share-based payment arrangement | share | 410,076 |  |
Weighted average exercise price of share options exercisable in share-based payment arrangement | $ 12.39 |  |
13.10 - 14.78 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | share | 1,815,139 |  |
Weighted average exercise price of share options outstanding in share-based payment arrangement | $ 13.53 |  |
Weighted average remaining contractual life of outstanding share options | year | 2.9 |  |
Number of share options exercisable in share-based payment arrangement | share | 897,039 |  |
Weighted average exercise price of share options exercisable in share-based payment arrangement | $ 13.44 |  |
15.80 - 18.07 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | share | 1,570,579 |  |
Weighted average exercise price of share options outstanding in share-based payment arrangement | $ 16.41 |  |
Weighted average remaining contractual life of outstanding share options | year | 1.8 |  |
Number of share options exercisable in share-based payment arrangement | share | 1,315,380 |  |
Weighted average exercise price of share options exercisable in share-based payment arrangement | $ 16.39 |  |
24.72 - 27.77 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options outstanding in share-based payment arrangement | share | 153,510 |  |
Weighted average exercise price of share options outstanding in share-based payment arrangement | $ 26.60 |  |
Weighted average remaining contractual life of outstanding share options | year | 2.4 |  |
Number of share options exercisable in share-based payment arrangement | share | 153,510 |  |
Weighted average exercise price of share options exercisable in share-based payment arrangement | $ 26.60 |  |
Bottom of range [member] | 6.94 - 9.98 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of outstanding share options | 6.94 |  |
Bottom of range [member] | 10.58 - 12.97 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of outstanding share options | 10.58 |  |
Bottom of range [member] | 13.10 - 14.78 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of outstanding share options | 13.10 |  |
Bottom of range [member] | 15.80 - 18.07 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of outstanding share options | 15.80 |  |
Bottom of range [member] | 24.72 - 27.77 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of outstanding share options | 24.72 |  |
Top of range [member] | 6.94 - 9.98 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of outstanding share options | 9.98 |  |
Top of range [member] | 10.58 - 12.97 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of outstanding share options | 12.97 |  |
Top of range [member] | 13.10 - 14.78 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of outstanding share options | 14.78 |  |
Top of range [member] | 15.80 - 18.07 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of outstanding share options | 18.07 |  |
Top of range [member] | 24.72 - 27.77 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of outstanding share options | $ 27.77 |  |

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