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Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS (Narrative) (Details)

v2.4.0.8
FAIR VALUE OF FINANCIAL INSTRUMENTS (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý
Management Estimate of 62% Fe 62.00% Ìý
Goodwill, Impairment Loss $ 0 $ 80.9
Amapa [Member]
Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý
Equity Method Investments, Fair Value Disclosure Ìý 0
Equity Method Investment, Other than Temporary Impairment Ìý 67.6
Wabush and Cliffs Chromite Ontario and Cliffs Chromite Far North [Member]
Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý
Impairment of Long-Lived Assets Held-for-use Ìý 155.4
Cliffs Chromite Ontario and Cliffs Chromite Far North [Member]
Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý
Goodwill, Impairment Loss Ìý $ 80.9