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Share-based payment plans - Cash-settled share payment plans (Details) - SAR - Option
1 Months Ended 12 Months Ended
Jul. 31, 2014
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding at the beginning of the period.     11,328 11,328
Granted 215,688      
Forfeited / cancelled     (11,328)  
Exercised   0 0 0
Outstanding at December 31   0   11,328
Exercisable at December 31       11,328