Quarterly report pursuant to Section 13 or 15(d)

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Narrative) (Details)

betfred sportsbook review|Welcome_CLOSURE OBLIGATIONS (Narrative) v2.4.1.9
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Mar. 31, 2015
Dec. 31, 2014
Environmental Remediation Obligations [Abstract]    
Total environmental and mine closure obligations $ 169.0clf_EnvironmentalLossContingencyAndMineReclamationAndClosingLiabilityCurrentAndNoncurrent $ 170.8clf_EnvironmentalLossContingencyAndMineReclamationAndClosingLiabilityCurrentAndNoncurrent