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Annual report pursuant to Section 13 and 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS (Narrative) (Details)

v3.3.1.900
FAIR VALUE OF FINANCIAL INSTRUMENTS (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Mar. 31, 2015
USD ($)
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý Ìý
Debt Instrument, Par Value $ 3,448.2 $ 3,980.0 Ìý Ìý
Management Estimate of 62% Fe 62.00% Ìý Ìý Ìý
Goodwill, Impairment Loss $ 0.0 73.5 Ìý Ìý
Other Asset Impairment Charges Ìý 562.0 Ìý Ìý
Tangible Asset Impairment Charges Ìý 537.8 Ìý Ìý
Global Exploration Investment in Venture [Member] Ìý Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý Ìý
Equity Method Investments, Fair Value Disclosure Ìý 0.0 Ìý Ìý
Equity Method Investment, Other than Temporary Impairment Ìý 9.2 Ìý Ìý
Amapa [Member] Ìý Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý Ìý
Equity Method Investment, Other than Temporary Impairment Ìý Ìý $ 67.6 Ìý
Asia Pacific Iron Ore [Member] Ìý Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý Ìý
Goodwill, Impairment Loss Ìý 73.5 Ìý Ìý
Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member] Ìý Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý Ìý
Debt Instrument, Par Value $ 544.2 Ìý Ìý Ìý
Stated interest rate 7.75% Ìý Ìý Ìý
Debt Instrument, Fair Value Disclosure Ìý Ìý Ìý $ 397.2
Debt discount Ìý Ìý Ìý 0.27
Debt Instrument, Unamortized Discount $ 131.5 Ìý Ìý $ 147.0
Fair Value, Inputs, Level 2 [Member] | Global Exploration Investment in Venture [Member] Ìý Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý Ìý
Equity Method Investments, Fair Value Disclosure Ìý 0.0 Ìý 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 Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý Ìý
Debt Instrument, Fair Value Disclosure $ 134.7 $ 0.0 Ìý $ 397.2