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Income taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income taxes    
Expense for the year $ 34.1 $ 25.1
Adjustment in respect of prior years 6.0 (5.6)
Current income tax expense (recovery) 40.1 19.5
Origination and reversal of temporary differences in the current year (7.7) 15.7
U.S. Tax Reform impact 2.0 7.1
Impact of changes in tax rate 2.9 (0.9)
Change in unrecognized deductible temporary differences 19.0 0.1
Adjustments in respect of prior years (6.2) 0.6
Other   (0.8)
Deferred income tax (recovery) expense 10.0 21.8
Total income tax expense $ 50.1 $ 41.3