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Income taxes - Other (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income taxes    
Expense for the year $ 50.9 $ 42.3
Adjustment in respect of prior years (2.4) (3.2)
Current income tax expense 48.5 39.1
Origination and reversal of temporary differences (30.2) 20.2
Impact of changes in tax rates (0.8) (1.0)
Change in unrecognized deductible temporary differences (6.4) (0.1)
Adjustments in respect of prior years 2.2 3.4
Other   0.2
Deferred income tax expense (35.2) 22.7
Income tax expense $ 13.3 $ 61.8