Summary of significant accounting policies - Plant and Equipment (Details) |
Dec. 31, 2024 |
|---|---|
| Leasehold land and buildings | |
| Property, plant and equipment | |
| Property, Plant and Equipment, Useful Life | 50 years |
| Machinery and equipment | Maximum | |
| Property, plant and equipment | |
| Property, Plant and Equipment, Useful Life | 10 years |
| Machinery and equipment | Minimum | |
| Property, plant and equipment | |
| Property, Plant and Equipment, Useful Life | 4 years |
| Leasehold improvements | |
| Property, plant and equipment | |
| Property, Plant and Equipment, Useful Life | 5 years |
| Vehicles and office equipment | Maximum | |
| Property, plant and equipment | |
| Property, Plant and Equipment, Useful Life | 5 years |
| Vehicles and office equipment | Minimum | |
| Property, plant and equipment | |
| Property, Plant and Equipment, Useful Life | 4 years |