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Income tax and deferred taxes - Narrative (Details) - yr | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Income Tax And Deferred Taxes [Line Items] |  |  |
Applicable tax rate, percentage | 27.00% | 27.00% | 27.00%
Prescriptive period for review legal deadline (in years) | 3 |  |
Prescriptive period extended for review legal deadline (in years) | 6 |  |
Australia |  |  |
Disclosure Of Income Tax And Deferred Taxes [Line Items] |  |  |
Prescriptive period for audit, legal deadline, Australian Taxation Office | 4 years |  |
United States |  |  |
Disclosure Of Income Tax And Deferred Taxes [Line Items] |  |  |
Prescriptive period for review legal deadline (in years) | 3 |  |
Prescriptive period extended for review legal deadline (in years) | 6 |  |
Mexico |  |  |
Disclosure Of Income Tax And Deferred Taxes [Line Items] |  |  |
Applicable tax rate, percentage | 30.00% | 30.00% |
Prescriptive period for review legal deadline (in years) | 5 |  |
Spain |  |  |
Disclosure Of Income Tax And Deferred Taxes [Line Items] |  |  |
Prescriptive period for review legal deadline (in years) | 4 |  |
Belgium |  |  |
Disclosure Of Income Tax And Deferred Taxes [Line Items] |  |  |
Prescriptive period for review legal deadline (in years) | 3 |  |
Prescriptive period extended for review legal deadline (in years) | 5 |  |
South Africa |  |  |
Disclosure Of Income Tax And Deferred Taxes [Line Items] |  |  |
Applicable tax rate, percentage | 27.00% | 27.00% |
Prescriptive period for review legal deadline (in years) | 3 |  |
Prescriptive period extended for review legal deadline (in years) | 5 |  |
China |  |  |
Disclosure Of Income Tax And Deferred Taxes [Line Items] |  |  |
Applicable tax rate, percentage | 25.00% | 25.00% |
Prescriptive period for review legal deadline (in years) | 3 |  |
Prescriptive period extended for review legal deadline (in years) | 5 |  |
South Korea |  |  |
Disclosure Of Income Tax And Deferred Taxes [Line Items] |  |  |
Applicable tax rate, percentage | 24.00% | 24.00% |
Prescriptive period for review legal deadline (in years) | 5 |  |
Prescriptive period extended for review legal deadline (in years) | 7 |  |
South Korea | Bottom of range |  |  |
Disclosure Of Income Tax And Deferred Taxes [Line Items] |  |  |
Applicable tax rate, percentage | 9.00% | 9.00% |
Prescriptive period extended for review legal deadline failure to file tax return (in years) | 5 years |  |
Prescriptive period extended for review legal deadline, tax evasion or fraud (in years) | 10 years |  |
South Korea | Top of range |  |  |
Disclosure Of Income Tax And Deferred Taxes [Line Items] |  |  |
Applicable tax rate, percentage | 24.00% | 24.00% |
Prescriptive period extended for review legal deadline failure to file tax return (in years) | 10 years |  |
Prescriptive period extended for review legal deadline, tax evasion or fraud (in years) | 15 years |  |
Mining royalties operation |  |  |
Disclosure Of Income Tax And Deferred Taxes [Line Items] |  |  |
Applicable tax rate, percentage | 5.00% |  |
Caliche extraction operation |  |  |
Disclosure Of Income Tax And Deferred Taxes [Line Items] |  |  |
Applicable tax rate, percentage | 5.44% |  |

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