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Share capital - Additional Information (Details) - USD ($)
Dec. 31, 2019
Sep. 26, 2019
Dec. 31, 2018
Non voting shares      
Disclosure of classes of share capital [line items]      
Number of non-voting common shares outstanding (in shares) 0   0
ATM Program      
Disclosure of classes of share capital [line items]      
Maximum issuance of common shares from treasury, value   $ 125,000,000  
Number of shares issued (in shares) 6,104,958