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Share-based compensation (Weighted Average Assumptions for Option Grants) (Details) - Options
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividend yield 1.40% 1.70% 1.70%
Expected volatility 22.00% 23.00% 20.10%
Risk-free interest rate 4.30% 4.10% 1.90%
Expected life 5 years 8 months 12 days 5 years 8 months 12 days 5 years 9 months 18 days