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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

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