INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of loss before recovery of income taxes
Domestic	$ (851.1)	$ (574.5)	$ (205.6)
Foreign	1,943.7	(739.9)	(188.6)
Income (loss) before provision for (recovery of) income taxes	1,092.6	(1,314.4)	(394.2)
Current:
Domestic	0.6us-gaap_CurrentFederalTaxExpenseBenefit	3.4us-gaap_CurrentFederalTaxExpenseBenefit	7.2us-gaap_CurrentFederalTaxExpenseBenefit
Foreign	150.1us-gaap_CurrentForeignTaxExpenseBenefit	80.0us-gaap_CurrentForeignTaxExpenseBenefit	56.3us-gaap_CurrentForeignTaxExpenseBenefit
Total	150.7us-gaap_CurrentIncomeTaxExpenseBenefit	83.4us-gaap_CurrentIncomeTaxExpenseBenefit	63.5us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Domestic	0	0	(11.9)
Foreign	29.7	(534.2)	(329.8)
Total	29.7us-gaap_DeferredIncomeTaxExpenseBenefit	(534.2)us-gaap_DeferredIncomeTaxExpenseBenefit	(341.7)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for (recovery of) income taxes	$ 180.4us-gaap_IncomeTaxExpenseBenefit	$ (450.8)us-gaap_IncomeTaxExpenseBenefit	$ (278.2)us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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