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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
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