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Share-based compensation expense (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based compensation expense |
Schedule of Share-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | ​ | For the six months ended |
​ | ​ | June 30, | ​ | ​ | June 30, | ​
​ |  | 2021 |  | 2020 |  |  | 2021 |  |  | 2020 |
Stock options and restricted share units | ​ | $ | 1.6 | ​ | $ | 1.3 | ​ | ​ | $ | 3.0 | ​ | ​ | $ | 2.5 | ​
Deferred share units | ​ |  | 3.4 | ​ |  | 5.5 | ​ | ​ |  | 4.0 | ​ | ​ |  | 5.6 | ​
​ | ​ | $ | 5.0 | ​ | $ | 6.8 | ​ | ​ | $ | 7.0 | ​ | ​ | $ | 8.1 | ​

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