Stock-based compensation - Schedule of Stock Option Assumptions (Details) - Stock options - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price of our common stock on grant date (in usd per share)	$ 300.30	$ 235.97	$ 230.92
Volatility	26.90%	23.30%	24.50%
Expected life (in years)	5 years 8 months 12 days	5 years 8 months 12 days	5 years 8 months 12 days
Risk-free interest rate	4.40%	3.40%	2.80%
Expected dividend yield	3.20%	3.50%	3.30%
Fair value of stock options granted (in usd per share)	$ 69.34	$ 41.86	$ 42.43