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GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Schedule Of Earnings To Be Recognized On Below Market Sales Contract) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Estimated recognition of product revenues, below-market sales contracts [Abstract]  
2015 $ 23.0clf_FutureBelowMarketSalesContractsRevenueYearOne
2016 23.1clf_FutureBelowMarketSalesContractsRevenueYearTwo
Total $ 46.1clf_FutureBelowMarketSalesContractsRevenueWithinFiveYears