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Income taxes - Other (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Current income tax expense    
Expense for the year $ 86.0 $ 50.9
Adjustment in respect of prior years 1.0 (2.4)
Current income tax expense 87.0 48.5
Origination and reversal of temporary differences 54.5 (30.2)
Impact of changes in tax rates (1.1) (0.8)
Reversal of unrecognized deductible temporary differences (12.9) (6.4)
Adjustments in respect of prior years (2.4) 2.2
Other (1.0)  
Deferred income tax expense 37.1 (35.2)
Income tax expense (recovery) $ 124.1 $ 13.3