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Material accounting policies - Summary of depreciation method and the estimated useful lives (Details) - Buildings [member]
12 Months Ended
Dec. 31, 2025
Disclosure of intangible assets with indefinite useful life [line items]  
Depreciation method Straight-line
Maximum [Member]  
Disclosure of intangible assets with indefinite useful life [line items]  
Useful lives 50 years
Minimum [Member]  
Disclosure of intangible assets with indefinite useful life [line items]  
Useful lives 40 years