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Commitments and contingencies - Narrative (Details) - t t in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Purchase commitment of methanol supply | Within one year |  |  |
Disclosure of associates [line items] |  |  |
Purchase commitments (in tonnes) |  | 0.8 |
Atlas Plant |  |  |
Disclosure of associates [line items] |  |  |
Percentage of marketing rights in production |  | 100.00% |
Percentage of ownership interest in associates |  | 63.10% | 63.10%
Atlas Plant | Purchase commitment of methanol supply |  |  |
Disclosure of associates [line items] |  |  |
Purchase commitments (in tonnes) |  | 0.6 |
Atlas Plant | Purchase commitment of methanol supply | Forecast |  |  |
Disclosure of associates [line items] |  |  |
Purchase commitments (in tonnes) | 0.4 |  |
Atlas Plant | Trinidad |  |  |
Disclosure of associates [line items] |  |  |
Percentage of ownership interest in associates |  | 63.10% |
Atlas Plant | Egypt |  |  |
Disclosure of associates [line items] |  |  |
Percentage of ownership interest in associates |  | 50.00% |
Egypt Plant | Purchase commitment of methanol supply |  |  |
Disclosure of associates [line items] |  |  |
Purchase commitments (in tonnes) |  | 0.6 |

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