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Financial instruments - Fair values and risk management - Financial instruments measured at fair value (Details) - Discounted cash flow
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of fair value measurement of assets [line items]    
Time to liquidity event 4 years  
Volatility rate, measurement input    
Disclosure of fair value measurement of assets [line items]    
Significant unobservable input, assets (%)   0.700
Risk free rate, measurement input    
Disclosure of fair value measurement of assets [line items]    
Significant unobservable input, assets (%)   0.0249
Measurement input, discount rate    
Disclosure of fair value measurement of assets [line items]    
Significant unobservable input, assets (%)   0.175
Lack of marketability, measurement input    
Disclosure of fair value measurement of assets [line items]    
Significant unobservable input, assets (%)   0.251