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Income taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Income taxes (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income taxes
Current income tax expense	$ 11.7	$ 5.4	$ 21.4	$ 12.8
Deferred income tax expense	2.0	5.7	5.3	11.8
Total income tax expense	$ 13.7	$ 11.1	$ 26.7	$ 24.6

- Definition

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

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