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Quarterly report pursuant to Section 13 or 15(d)

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Asset Retirement Obligation Disclosure) (Details)

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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Asset Retirement Obligation Disclosure) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Asset Retirement Obligation [Roll Forward] Ìý Ìý
Asset retirement obligation at beginning of period $ 142.4us-gaap_AssetRetirementObligation $ 177.6us-gaap_AssetRetirementObligation
Accretion expense 1.2us-gaap_AssetRetirementObligationAccretionExpense 5.7us-gaap_AssetRetirementObligationAccretionExpense
Exchange rate changes (1.5)us-gaap_AssetRetirementObligationForeignCurrencyTranslation (2.4)us-gaap_AssetRetirementObligationForeignCurrencyTranslation
Revision in estimated cash flows Ìý (38.5)us-gaap_AssetRetirementObligationRevisionOfEstimate
Asset retirement obligation at end of period $ 142.1us-gaap_AssetRetirementObligation $ 142.4us-gaap_AssetRetirementObligation