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Income taxes - Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income taxes    
Expense for the year $ 25.1 $ 35.5
Adjustment in respect of prior years (5.6) 5.4
Current income tax expense 19.5 40.9
Origination and reversal of temporary differences in the current year 15.7 15.3
Impact of U.S. Tax Reform 7.1  
Impact of changes in tax rate (0.9) (0.8)
Change in (reversal of) unrecognized deductible temporary differences 0.1 (4.4)
Adjustments in respect of prior years 0.6 (4.3)
Other (0.8) (1.0)
Deferred income tax expenses 21.8 4.8
Total income tax expense $ 41.3 $ 45.7