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Stockholders' equity (Dividends) (Details) - $ / shares			1 Months Ended												3 Months Ended												12 Months Ended
	Mar. 08, 2022	Dec. 03, 2021	Oct. 31, 2021	Jul. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Oct. 31, 2020	Jul. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Oct. 31, 2019	Jul. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Common stock, dividends declared per share (in usd per share)		$ 1.94	$ 1.76	$ 1.76	$ 1.76	$ 1.76	$ 1.60	$ 1.60	$ 1.60	$ 1.60	$ 1.45	$ 1.45	$ 1.45	$ 1.45													$ 7.22	$ 6.56	$ 5.95
Common stock, dividends paid per share (in usd per share)															$ 1.76	$ 1.76	$ 1.76	$ 1.76	$ 1.60	$ 1.60	$ 1.60	$ 1.60	$ 1.45	$ 1.45	$ 1.45	$ 1.45
Forecast
Class of Stock [Line Items]
Common stock, dividends paid per share (in usd per share)	$ 1.94

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Aggregate dividends paid during the period for each share of common stock outstanding.

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-Publisher FASB
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-SubTopic 10
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