Financial instruments - Investments (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Disclosure of financial assets [line items] | ||
| Mark-to-market gain (loss) on financial assets | $ (12,897) | $ (16,877) |
| Green Hydrogen | ||
| Disclosure of financial assets [line items] | ||
| Mark-to-market gain (loss) on financial assets | 0 | 15 |
| Forsee Power | ||
| Disclosure of financial assets [line items] | ||
| Mark-to-market gain (loss) on financial assets | (3,501) | (14,865) |
| Wisdom Motor | ||
| Disclosure of financial assets [line items] | ||
| Mark-to-market gain (loss) on financial assets | (4,900) | 0 |
| Quantron AG | ||
| Disclosure of financial assets [line items] | ||
| Mark-to-market gain (loss) on financial assets | (4,237) | 150 |
| HyCap Fund | ||
| Disclosure of financial assets [line items] | ||
| Mark-to-market gain (loss) on financial assets | 214 | (1,597) |
| CleanH2 Fund | ||
| Disclosure of financial assets [line items] | ||
| Mark-to-market gain (loss) on financial assets | $ (473) | $ (580) |