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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 |  |

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