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Shareholders’ equity - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Shareholders’ equity        
Dividends declared $ 47.4 $ 44.6 $ 92.3 $ 87.9
Dividend declared per share $ 0.25 $ 0.24 $ 0.49 $ 0.47
Cash dividends paid $ 35.1 $ 35.0 $ 70.0 $ 70.6
Share dividends paid - DRIP $ 12.3 $ 9.6 $ 22.3 $ 17.3