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Share-based compensation expense (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based compensation expense |
Schedule of Share-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  | 2021 |  |  | 2020 |
Stock options and restricted share units | ​ | ​ | $ | 8.0 | ​ | ​ | $ | 5.6 | ​
Deferred share units | ​ | ​ |  | 3.2 | ​ | ​ |  | 4.0 | ​
​ | ​ | ​ | $ | 11.2 | ​ | ​ | $ | 9.6 | ​

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