Annual report pursuant to Section 13 and 15(d)

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

v2.4.1.9
GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Estimated Amortization Expense Relating To Intangible Assets) (Details) (USD $)
In Millions, unless otherwise specified
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