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Income taxes (Details) - USD ($) $ in Millions	3 Months Ended
Income taxes (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Income taxes
Current income tax expense	$ 7.4	$ 7.8
Deferred income tax expenses	6.1	2.6
Total income tax expense	$ 13.5	$ 10.4

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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