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Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS (Narrative) (Details)

v3.2.0.727
FAIR VALUE OF FINANCIAL INSTRUMENTS (Narrative) (Details)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Mar. 31, 2015
USD ($)
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý
Management Estimate of 62% Fe 62.00% Ìý Ìý
Goodwill, Impairment Loss $ 0.0 $ 73.5 Ìý
Other Asset Impairment Charges Ìý 562.0 Ìý
Global Exploration Investment in Venture [Member] Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý
Equity Method Investments, Fair Value Disclosure Ìý 0.0 Ìý
Equity Method Investment, Other than Temporary Impairment Ìý 9.2 Ìý
Asia Pacific Iron Ore [Member] Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý
Goodwill, Impairment Loss Ìý 73.5 Ìý
Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member] Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý
Debt Instrument, Par Value $ 544.2 Ìý Ìý
Debt Instrument, Fair Value Disclosure Ìý Ìý $ 397.2
Stated interest rate 7.75% Ìý Ìý
Debt discount Ìý Ìý 0.27
Debt Instrument, Unamortized Discount $ 142.0 Ìý $ 147.0
Fair Value, Inputs, Level 2 [Member] | Global Exploration Investment in Venture [Member] Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý
Equity Method Investments, Fair Value Disclosure Ìý 0.0 Ìý
Fair Value, Inputs, Level 2 [Member] | Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member] Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý
Debt Instrument, Fair Value Disclosure $ 348.2 $ 0.0 $ 397.2