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Shareholders' equity - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Shareholders' equity        
Dividend declared per share $ 0.30 $ 0.26 $ 0.56 $ 0.51
Cash dividends $ 45.2 $ 39.8 $ 87.0 $ 76.0
DRIP dividends 11.4 10.1 19.5 21.0
Dividends declared $ (56.6) $ (49.9) $ (106.5) $ (97.0)