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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently Issued Accounting Pronouncements (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Provisionally priced sales
Revenue from provisional price adjustments	$ 3.0
Reclassification of accumulated impairment losses on equity investment to comprehensive income	44.1
Reclassification of time value of options changes to deficit	$ 3.1

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- Definition

The amount of accumulated impairment losses on equity investments recognized in profit loss that will be reclassified to comprehensive income (loss) following adoption of new IFRS standard.

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- Definition

The amount of time value of option changes out of profit (loss) to accumulated other comprehensive income following the adoption of new IFRS standard.

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The amount of revenue from provisional price adjustments.

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