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Shareholders' equity - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Shareholders' equity        
Dividends declared $ 10.6 $ 10.1 $ 21.1 $ 14.8
Dividends paid $ 10.5 $ 10.1 $ 21.1 $ 20.1
Dividends paid per share     $ 0.0525 $ 0.05
Number of shares issued from treasury 0 0 0 0