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Income and other taxes - Unused tax losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax effect $ (7,381) $ (7,077)
Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount 1,355,760  
Tax effect 298,267  
Expire | Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount 949,959  
Tax effect 208,991  
Losses generated in 2015 (expires 2035) | Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount 282,437  
Tax effect 62,136  
Losses generated in 2016 (expires 2036) | Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount 432,581  
Tax effect 95,168  
Losses generated in 2017 (expires 2037) | Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount 234,941  
Tax effect 51,687  
Losses generated in 2019 | Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount 255,244  
Tax effect 56,154  
Losses generated in 2020 | Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount 121,321  
Tax effect 26,691  
Losses generated in 2023 | Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount 29,235  
Tax effect $ 6,432