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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accumulated other comprehensive income (loss)
Balance, beginning of period	$ 21.1	$ 39.1
Adjustment on initial application of IFRS 9	(56.3)
Other comprehensive loss before tax	(103.8)	(18.8)
Tax	21.0	0.8
Losses on cash flow hedges transferred to cost of non-financial assets	19.5
Balance, end of period	(98.5)	21.1
Income tax expense (recovery) relating to cash flow hedges - effective portion of changes in fair value	(20.9)	4.8
Long-term Investments
Accumulated other comprehensive income (loss)
Balance, beginning of period	6.9	23.6
Adjustment on initial application of IFRS 9	(56.3)
Other comprehensive loss before tax	(26.1)	(16.4)
Tax	0.3	(0.3)
Balance, end of period	(75.2)	6.9
Derivative Contracts
Accumulated other comprehensive income (loss)
Balance, beginning of period	14.2	15.5
Other comprehensive loss before tax	(77.7)	(2.4)
Tax	20.7	1.1
Losses on cash flow hedges transferred to cost of non-financial assets	19.5
Balance, end of period	(23.3)	$ 14.2
Income tax expense (recovery) relating to cash flow hedges - effective portion of changes in fair value	$ 10.0

X

- Definition

The amount of accumulated items of income and expense (including reclassification adjustments) that are not recognised in profit or loss as required or permitted by other IFRSs. [Refer: IFRSs [member]; Other comprehensive income]

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The amounts removed from equity and included in the initial cost or other carrying amount of a non-financial asset (liability) whose acquisition or incurrence was a hedged, highly probable forecast transaction, net of tax. [Refer: Carrying amount [member]]

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to cash flow hedges. [Refer: Cash flow hedges [member]; 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 other comprehensive income that will be reclassified to profit or loss, before tax. [Refer: Other comprehensive income]

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Amount after tax of changes in equity or changes in net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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