Stock-based compensation - Summary of assumptions used in determining fair value (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average dividend yield	2.40%	2.60%	2.60%
Weighted-average volatility	30.70%	31.00%	31.70%
Volatilities, minimum	26.30%	28.50%	25.30%
Volatilities, maximum	32.30%	35.50%	36.80%
Risk-free interest rates, minimum	4.28%	3.92%	1.03%
Risk-free interest rates, maximum	5.03%	5.03%	2.00%
Weighted-average expected lives	7 years	7 years	8 years
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility of the Company's stock	29.80%
Risk-free interest rate	4.38%