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Income taxes - Summary of unrecognized tax losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
2031-2043 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses $ 432,863  
Capital losses with no expiry | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 386,707 $ 258,795
2025-2029 | Greece    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 127,541  
2025-2031 | Romania    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses $ 6,952  
2030-2043 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses   464,761
2024-2028 | Greece    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses   182,444
2024-2030 | Romania    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses   $ 6,811