Stockholders' equity - Additional Information (Details) - $ / shares	3 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Equity [Abstract]
Cash dividends declared per common share (in dollars per share)	$ 1.15	$ 1.15	$ 1.15	$ 1.02	$ 1.02	$ 1.02
Cash dividends paid per common share (in dollars per share)	$ 1.15	$ 1.15	$ 1.15	$ 1.02	$ 1.02	$ 1.02