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Long-term financial investments - Narrative (Details) € in Thousands, £ in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended | 37 Months Ended | 41 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) | May 31, 2024 shares | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Oct. 31, 2021 | Aug. 31, 2021 GBP (£) | Dec. 31, 2024 USD ($) shares | Dec. 31, 2024 EUR (€) shares | Dec. 31, 2024 GBP (£) shares | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 GBP (£) | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 USD ($) | Feb. 29, 2024 USD ($) | Sep. 30, 2022 EUR (€)
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange gain (loss) |  |  |  |  |  |  |  | $ (14,788) |  |  | $ (12,897) |  |  |  |  |  |
Equity-accounted investments |  |  |  |  |  |  |  | 8,238 |  |  | 13,901 |  |  |  | $ 8,238 |  |
Forsee Power |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange gain (loss) |  |  |  |  |  |  |  | $ (12,699) |  |  | (3,501) |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  |  |  | 9.80% |  | 7.30% | 7.30% | 7.30% |  |  |  |  |  |  |
Forsee Power | Subsequent Contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity-accounted investments |  |  |  |  |  |  |  | $ 2,270 |  |  | 14,969 |  |  |  | 2,270 |  |
Wisdom Motor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange gain (loss) |  |  |  |  |  |  |  | $ (2,200) |  |  | (4,900) |  |  |  |  |  |
Proportion of ownership interest in joint venture | 7.20% |  |  | 7.20% |  |  |  | 6.70% | 6.70% | 6.70% |  |  |  |  |  |  |
Equity-accounted investments | $ 10,000 |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions (Proceeds) |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |
Wisdom Motor | Subsequent Contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity-accounted investments |  |  |  |  |  |  |  | $ 1,900 |  |  | 4,100 |  |  |  | 1,900 |  |
Quantron AG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange gain (loss) |  |  |  |  |  |  |  | $ (4,401) |  |  | (4,237) |  |  |  |  |  |
Proportion of ownership interest in joint venture |  | 3.00% | 1.90% |  |  |  |  | 3.00% | 3.00% | 3.00% |  |  |  |  |  |  |
Equity-accounted investments |  |  | $ 5,183 |  |  |  |  |  |  |  |  |  |  |  |  |  | € 5,000
Contributions (Proceeds) |  |  |  |  |  |  |  | $ 3,304 |  | £ 3,000 |  |  |  |  |  |  |
Number of shares in entity held by entity or by its subsidiaries or associates | shares |  | 1,000 |  |  |  |  |  | 793 | 793 | 793 |  |  |  |  |  |  |
Quantron AG | Subsequent Contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity-accounted investments |  |  |  |  |  |  |  | $ 0 |  |  | 4,400 |  |  |  | 0 |  |
HyCap Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions (Proceeds) |  |  |  |  |  |  | £ 15,755 |  |  | £ 15,754 |  |  |  |  | 20,314 |  |
HyCap Fund | Subsequent Contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity-accounted investments |  |  |  |  |  |  |  | 23,987 |  |  | 12,801 |  |  |  | 23,987 |  |
Contributions (Proceeds) |  |  |  |  |  |  |  | 5,084 |  |  | 214 |  |  |  |  |  |
HyCap Fund | Initial Contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions (Proceeds) |  |  |  |  |  |  |  | 6,102 |  | £ 4,768 | 4,624 |  | £ 3,771 |  |  |  |
CleanH2 Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions (Proceeds) |  |  |  |  | $ 10,475 |  |  |  | € 9,663 |  |  |  |  | € 9,663 |  |  |
CleanH2 Fund | Subsequent Contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity-accounted investments |  |  |  |  |  |  |  | 9,043 |  |  | 4,075 |  |  |  | 9,043 |  |
CleanH2 Fund | Initial Contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions (Proceeds) |  |  |  |  |  |  |  | 5,328 | € 4,962 |  | 3,983 | € 3,705 |  |  |  |  |
Hydrogen Funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange gain (loss) |  |  |  |  |  |  |  | (360) |  |  | (473) |  |  |  |  |  |
Templewater |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange gain (loss) |  |  |  |  |  |  |  | $ (212) |  |  | 0 |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  |  |  |  |  | 2.00% | 2.00% | 2.00% |  |  |  |  |  |  |
Equity-accounted investments |  |  |  |  |  |  |  | $ 315 |  |  | 0 |  |  |  | $ 315 |  |
Contributions (Proceeds) |  |  |  |  |  |  |  | $ 527 |  |  | $ 0 |  |  |  |  |  |
Commitments in relation to joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |

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