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ENVIRONMENTAL REMEDIATION LIABILITIES (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Environmental Remediation Obligations [Abstract]  
Environmental remediation liabilities $ 32.6us-gaap_AccrualForEnvironmentalLossContingencies
Environmental remediation liabilities, classified as accrued liabilities 2.9us-gaap_AccruedEnvironmentalLossContingenciesCurrent
Environmental remediation liabilities, classified as other liabilities $ 29.7us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent