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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