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Stockholders' equity - Dividends (Details) - $ / shares		1 Months Ended													3 Months Ended												12 Months Ended
	Dec. 31, 2020	Mar. 31, 2023	Dec. 31, 2022	Oct. 31, 2022	Aug. 31, 2022	Mar. 31, 2022	Dec. 31, 2021	Oct. 31, 2021	Jul. 31, 2021	Mar. 31, 2021	Oct. 31, 2020	Jul. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Common stock, dividends declared per share (in usd per share)	$ 1.76		$ 2.13	$ 1.94	$ 1.94	$ 1.94	$ 1.94	$ 1.76	$ 1.76	$ 1.76	$ 1.60	$ 1.60	$ 1.60	$ 1.60													$ 7.95	$ 7.22	$ 6.56
Common stock, dividends paid per share (in usd per share)															$ 1.94	$ 1.94	$ 1.94	$ 1.94	$ 1.76	$ 1.76	$ 1.76	$ 1.76	$ 1.60	$ 1.60	$ 1.60	$ 1.60
Forecast
Class of Stock [Line Items]
Common stock, dividends paid per share (in usd per share)		$ 2.13

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-SubTopic 10
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