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Shareholders' equity - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Shareholders' equity        
Dividends declared $ 45.0 $ 42.8 $ 132.9 $ 124.7
Dividend declared per share $ 0.24 $ 0.23 $ 0.71 $ 0.68
Cash dividends paid $ 33.8 $ 31.8 $ 104.5 $ 94.0
Share dividends paid - DRIP $ 11.2 $ 11.0 $ 28.4 $ 30.7