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Other current assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Subclassifications of assets, liabilities and equities [abstract]    
Prepaid assets $ 13.1 $ 10.9
Advances on capital projects (i) 3.1 9.8
Derivative assets (note 17) 0.0 3.5
Other current assets $ 16.2 $ 24.2