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GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Estimated Amortization Expense Relating To Intangible Assets) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Estimated amortization expense, intangible assets [Abstract]  
2015 (remaining nine months) $ 3.0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2016 4.0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2017 4.0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2018 4.2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2019 3.1us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2020 2.5us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Total $ 20.8clf_TotalAmortizationExpenseFiniteLivedIntangibleAssets