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Shareholders' equity - At-the-market equity offering (Details) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 11, 2020 | Jun. 30, 2021 | Dec. 31, 2020
Shareholders' equity |  |  |
Maximum value of shares that can be issued from treasury to public | $ 300 |  |
Share Capital |  |  |
Shareholders' equity |  |  |
Number of shares issued at At-the-market equity offering |  | 0 | 1,054,800

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