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INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
INCOME TAXES
U.S. federal and state statutory corporate income tax rate (as a percent)	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Recovery of income taxes related to Argentine peso devaluation	$ 1.2mux_IncomeTaxExpenseBenefitResultingFromFluctuationsInForeignExchangeRate	$ 18.9mux_IncomeTaxExpenseBenefitResultingFromFluctuationsInForeignExchangeRate

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- Definition

Represents the income tax expense (benefit) related to fluctuations in the foreign exchange rate between the Argentine peso and the U.S. dollar.

+ References

No definition available.

+ Details

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Period Type:	duration

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 6.I)

-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

+ Details

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Period Type:	duration

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- Details

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