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Income taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Income taxes (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income taxes
Current income tax expense (recovery)	$ 18.1	$ (1.3)	$ 30.9	$ 14.2
Deferred income tax (recovery) expenses	(4.3)	4.2	7.5	10.2
Total income tax expense	$ 13.8	$ 2.9	$ 38.4	$ 24.4

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax that relate to continuing operations. [Refer: Continuing operations [member]; Current tax expense (income); Deferred tax expense (income)]

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