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Share-based compensation - Disclosure of range of exercise prices of outstanding share options (Details)
12 Months Ended
Dec. 31, 2021
shares
$ / shares
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of share options outstanding in share-based payment arrangement | shares 3,730,580 4,240,869 4,939,344
Weighted average exercise price of share options outstanding in share-based payment arrangement $ 14.09 $ 14.22 $ 14.40
Weighted average remaining contractual life of outstanding share options 2 years 9 months 18 days    
Number of share options exercisable in share-based payment arrangement | shares 1,881,416 2,988,713  
Weighted average exercise price of share options exercisable in share-based payment arrangement $ 14.78 $ 14.96  
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 | shares 1,322,057    
Weighted average exercise price of share options outstanding in share-based payment arrangement $ 12.70    
Weighted average remaining contractual life of outstanding share options 3 years 6 months    
Number of share options exercisable in share-based payment arrangement | shares 536,757    
Weighted average exercise price of share options exercisable in share-based payment arrangement $ 12.71    
10.58 - 12.97 [Member] | Bottom of range [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weighted average exercise price of share options exercisable in share-based payment arrangement 10.58    
10.58 - 12.97 [Member] | Top of range [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weighted average exercise price of share options exercisable in share-based payment arrangement $ 12.97    
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 | shares 1,761,193    
Weighted average exercise price of share options outstanding in share-based payment arrangement $ 13.80    
Weighted average remaining contractual life of outstanding share options 2 years 10 months 24 days    
Number of share options exercisable in share-based payment arrangement | shares 817,729    
Weighted average exercise price of share options exercisable in share-based payment arrangement $ 14.10    
13.10 - 14.78 [Member] | Bottom of range [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weighted average exercise price of share options exercisable in share-based payment arrangement 13.10    
13.10 - 14.78 [Member] | Top of range [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weighted average exercise price of share options exercisable in share-based payment arrangement $ 14.78    
15.97 - 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 | shares 579,500    
Weighted average exercise price of share options outstanding in share-based payment arrangement $ 16.64    
Weighted average remaining contractual life of outstanding share options 1 year 3 months 18 days    
Number of share options exercisable in share-based payment arrangement | shares 459,100    
Weighted average exercise price of share options exercisable in share-based payment arrangement $ 16.61    
15.97 - 18.07 [Member] | Bottom of range [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weighted average exercise price of share options exercisable in share-based payment arrangement 15.97    
15.97 - 18.07 [Member] | Top of range [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weighted average exercise price of share options exercisable in share-based payment arrangement $ 18.07    
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 | shares 67,830    
Weighted average exercise price of share options outstanding in share-based payment arrangement $ 26.97    
Weighted average remaining contractual life of outstanding share options 4 months 24 days    
Number of share options exercisable in share-based payment arrangement | shares 67,830    
Weighted average exercise price of share options exercisable in share-based payment arrangement $ 26.97    
24.72 - 27.77 [Member] | Bottom of range [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weighted average exercise price of share options exercisable in share-based payment arrangement 24.72    
24.72 - 27.77 [Member] | Top of range [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weighted average exercise price of share options exercisable in share-based payment arrangement $ 27.77