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Shareholders equity - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Shareholders' equity    
Dividend declared per share $ 1.16 $ 1.03
Cash dividends $ 179.6 $ 154.9
DRIP dividends 41.8 42.3
Dividends declared $ (221.4) $ (197.2)