Summary of significant accounting policies - Summary of depreciation over the estimated useful lives of the assets (Details)	12 Months Ended
	Dec. 31, 2025
Buildings \| Minimum
Estimated useful lives of the assets
Useful life property, plant and equipment	10 years
Buildings \| Maximum
Estimated useful lives of the assets
Useful life property, plant and equipment	50 years
Machinery and equipment \| Minimum
Estimated useful lives of the assets
Useful life property, plant and equipment	3 years
Machinery and equipment \| Maximum
Estimated useful lives of the assets
Useful life property, plant and equipment	20 years
Leasehold improvements \| Minimum
Estimated useful lives of the assets
Useful life property, plant and equipment	5 years
Leasehold improvements \| Maximum
Estimated useful lives of the assets
Useful life property, plant and equipment	15 years
Office equipment \| Minimum
Estimated useful lives of the assets
Useful life property, plant and equipment	2 years
Office equipment \| Maximum
Estimated useful lives of the assets
Useful life property, plant and equipment	10 years
Other \| Minimum
Estimated useful lives of the assets
Useful life property, plant and equipment	2 years
Other \| Maximum
Estimated useful lives of the assets
Useful life property, plant and equipment	10 years