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Shareholders' equity - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Shareholders' equity        
Dividend declared per share $ 0.32 $ 0.30 $ 0.64 $ 0.56
Cash dividends $ 51.3 $ 45.2 $ 101.4 $ 87.0
DRIP dividends 9.7 11.4 21.8 19.5
Dividend paid $ 61.0 $ 56.6 $ 123.2 $ 106.5