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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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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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