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Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Schedule Of Earnings To Be Recognized On Below Market Sales Contract) (Details)

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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
3 Months Ended
Mar. 31, 2015
Estimated recognition of product revenues, below-market sales contracts [Abstract] Ìý
2015 (remaining nine months) $ 23.0clf_FutureBelowMarketSalesContractsRevenueRemainderofCurrentYear
2016 23.1clf_FutureBelowMarketSalesContractsRevenueYearOne
Total $ 46.1clf_FutureBelowMarketSalesContractsRevenueWithinFiveYears