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Income taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Income taxes (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income taxes
Current income tax expense	$ 5.4	$ 7.7	$ 12.8	$ 15.5
Deferred income tax expenses	5.7	3.4	11.8	6.0
Total income tax expense	$ 11.1	$ 11.1	$ 24.6	$ 21.5

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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