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Board of directors, Senior Management and Key management personnel - Narrative (Details) CLF in Thousands, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 26, 2023 CLF director | Apr. 26, 2022 CLF director | Dec. 31, 2023 CLF director employee | Dec. 31, 2023 USD ($) director employee | Dec. 31, 2022 CLF employee director | Dec. 31, 2022 USD ($) employee director | Dec. 31, 2021 CLF director | Dec. 31, 2021 USD ($) director
Related Party Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of directors | director | 6 | 6 |  |  |  |  |  |
Election period (in years) |  |  | 3 years | 3 years |  |  |  |
Key management personnel compensation | CLF | CLF 600 | CLF 600 |  |  |  |  |  |
Key management personnel compensation, percentage | 0.06% | 0.06% |  |  |  |  |  |
Variable compensation, percentage of net earnings |  |  |  |  |  |  | 110.00% | 110.00%
Variable compensation, percentage of net income |  |  |  |  | 1.10 | 1.10 |  |
Variable compensation, percentage of profit |  |  |  |  | 1.10 | 1.10 |  |
Number of employees | employee |  |  | 7,682 | 7,682 | 6,997 | 6,997 |  |
Chairman |  |  |  |  |  |  |  |
Related Party Disclosures [Line Items] |  |  |  |  |  |  |  |
Key management personnel compensation | CLF | CLF 800 | CLF 800 |  |  |  |  |  |
Key management personnel compensation, percentage | 0.12% | 0.12% |  |  |  |  |  |
Directors |  |  |  |  |  |  |  |
Related Party Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of directors | director | 2 |  | 8 | 8 |  |  |  |
Directors committee |  |  |  |  |  |  |  |
Related Party Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of directors | director |  |  | 3 | 3 | 3 | 3 | 3 | 3
Key management personnel compensation |  |  | CLF 200 | $ 7,516 | CLF 200 | $ 6,711 | CLF 200 | $ 3,749
Key management personnel compensation, percentage |  |  | 0.02% | 0.02% | 0.02% | 0.02% | 0.02% | 0.02%
Variable compensation, percentage of net income |  |  |  |  |  |  | 1.10 | 1.10
Health, Safety and Environmental Matters Committee |  |  |  |  |  |  |  |
Related Party Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of directors | director |  |  |  |  | 3 | 3 |  |
Key management personnel compensation | CLF |  |  |  |  | CLF 100 |  |  |
Corporate Governance Committee |  |  |  |  |  |  |  |
Related Party Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of directors | director |  |  |  |  | 3 | 3 |  |
Key management personnel compensation | CLF |  |  |  |  | CLF 100 |  |  |
Vice President |  |  |  |  |  |  |  |
Related Party Disclosures [Line Items] |  |  |  |  |  |  |  |
Key management personnel compensation | CLF | CLF 700 | CLF 700 |  |  |  |  |  |
Key Management Personnel |  |  |  |  |  |  |  |
Related Party Disclosures [Line Items] |  |  |  |  |  |  |  |
Key management personnel compensation | $ |  |  |  | $ 37,418 |  | $ 29,633 |  | $ 31,560
Number of employees | employee |  |  | 153 | 153 | 142 | 142 |  |

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