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Income and other taxes - Unused tax losses (Details) - USD ($) $ in Thousands | 12 Months Ended
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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 |

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