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Shareholders' equity - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Shareholders' equity        
Dividend declared per share $ 0.26 $ 0.25 $ 0.51 $ 0.49
Cash dividends $ 39.8 $ 35.1 $ 76.0 $ 70.0
DRIP dividends (10.1) (12.3) (21.0) (22.3)
Dividends declared $ 49.9 $ 47.4 $ 97.0 $ 92.3