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Income taxes - Recognized in OCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income taxes
Change in market value of available-for-sale investments	$ (21.4)	$ 47.1
Cumulative translation adjustment	(68.3)	77.2
Other comprehensive loss	(89.7)	124.3
Deferred tax (expense) recovery in other comprehensive income	3.0	(6.3)
Other comprehensive loss	3.0	(6.3)
Deferred tax	3.0	(6.3)
Change in market value of available-for-sale investments	(18.4)	40.8
Cumulative translation adjustment	(68.3)	77.2
Other comprehensive (loss) income	$ (86.7)	$ 118.0

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to available-for-sale financial assets. [Refer: Financial assets available-for-sale; Other comprehensive income]

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The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

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The amount of income tax relating to amounts recognised in other comprehensive income that will be reclassified to profit or loss. [Refer: Income tax relating to components of other comprehensive income]

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The amount of income and expense (including reclassification adjustments) that is not recognised in profit or loss as required or permitted by IFRSs. [Refer: IFRSs [member]]

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