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Financial risk management - Interest rate risk (Details) - Interest rate risk - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Financial risk management    
Percentage of reasonably possible increase in risk assumption 0.50% 0.50%
Percentage of reasonably possible decrease in risk assumption (0.50%) (0.50%)
Increase (decrease) in profit and loss due to reasonably possible increase in designated risk component $ (2.8) $ (2.7)
Increase (decrease) in profit and loss due to reasonably possible decrease in designated risk component 2.8 2.7
Increase (decrease) in other comprehensive income/loss due to reasonably possible increase in designated risk component (2.0) (2.1)
Increase (decrease) in other comprehensive income/loss due to reasonably possible decrease in designated risk component $ 2.0 $ 2.1