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Stockholders’ equity - Additional Information (Details) - $ / shares | 3 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Equity [Abstract] |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.77 | $ 0.77 | $ 0.77 | $ 0.62 | $ 0.62 | $ 0.62
Cash dividends paid per common share (in dollars per share) | $ 0.77 | $ 0.77 | $ 0.77 | $ 0.62 | $ 0.62 | $ 0.62

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