Annual report pursuant to Section 13 and 15(d)

GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Estimated Amortization Expense Relating To Intangible Assets) (Details)

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Dec. 31, 2014
Estimated amortization expense, intangible assets [Abstract]  
2015 $ 4.1us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 4.2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 4.0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 3.8us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 3.5us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Total $ 19.6clf_TotalAmortizationExpenseFiniteLivedIntangibleAssets