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Shareholders' equity - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Shareholders' equity        
Dividends declared $ 44.6 $ 42.5 $ 87.9 $ 81.9
Dividend declared per share $ 0.24 $ 0.23 $ 0.47 $ 0.45
Cash dividends paid $ 35.0 $ 32.1 $ 70.6 $ 62.2
Share dividends paid - DRIP $ 9.6 $ 10.4 $ 17.3 $ 19.7