Quarterly report pursuant to Section 13 or 15(d)

INCOME TAXES (Narrative) (Details)

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INCOME TAXES (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Examination [Line Items]    
Income Tax Expense (Benefit) $ 175.1us-gaap_IncomeTaxExpenseBenefit $ 29.6us-gaap_IncomeTaxExpenseBenefit
Discrete tax items expense $ 167.5clf_Discretetaxitemsexpense