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

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- Definition Future Below Market Sales Contracts Revenue, Remainder of Current Year + References No definition available. + Details
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Namespace Prefix: | clf_
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Balance Type: | credit
Period Type: | duration

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- Definition Future Below Market Sales Contracts Revenue, Within Five Years + References No definition available. + Details
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Namespace Prefix: | clf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Future Below Market Sales Contracts Revenue, Year One + References No definition available. + Details
Name: | clf_FutureBelowMarketSalesContractsRevenueYearOne
Namespace Prefix: | clf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Balance Type: | na
Period Type: | duration