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Stockholders' equity (Dividends) (Details) - $ / shares |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 11, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, dividends paid per share (in usd per share) |  | $ 1.45 | $ 1.45 | $ 1.45 | $ 1.45 | $ 1.32 | $ 1.32 | $ 1.32 | $ 1.32 | $ 1.15 | $ 1.15 | $ 1.15 | $ 1.15 |  |  |
Common stock, dividends declared per share (in usd per share) | $ 1.60 |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.95 | $ 5.41 | $ 4.77

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