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Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)

v2.4.0.8
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Empire [Member]
Jun. 30, 2013
Black Label And Black Thor Chromite Deposits [Member]
Jun. 30, 2013
Big Daddy Chromite Deposit [Member]
Jun. 30, 2013
CLCC [Member]
Jun. 30, 2013
Wabush [Member]
Jun. 30, 2013
Bloom Lake [Member]
Jun. 30, 2013
Asia Pacific Iron Ore [Member]
Cockatoo [Member]
USD ($)
Dec. 31, 2012
Asia Pacific Iron Ore [Member]
Cockatoo [Member]
AUD
Jun. 30, 2013
Equity Method Investments [Member]
Amapa [Member]
USD ($)
Dec. 31, 2012
Equity Method Investments [Member]
Amapa [Member]
USD ($)
Jun. 30, 2013
Other Liabilities [Member]
Cockatoo [Member]
Dec. 31, 2012
Other Liabilities [Member]
Cockatoo [Member]
Dec. 31, 2012
Sonoma [Member]
Asia Pacific Coal [Member]
AUD
Jul. 10, 2012
Sonoma [Member]
Asia Pacific Coal [Member]
Related Party Transaction [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Trading Day Window Determining Number of Common Shares Issuable on Conversion 20 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Depositary Share Interest in a Share of 7% Series A Mandatory Convertible Preferred Stock, Class A 0.025 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Current Fiscal Year End Date --12-31 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Ownership Interest Ìý 79.00% 100.00% 70.00% 100.00% 100.00% 75.00% Ìý Ìý Ìý Ìý Ìý Ìý Ìý 45.00%
Ownership interest, equity method investment Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 30.00% Ìý 0.00% [1] 50.00% [1] Ìý Ìý
Total percentage of Amapa sold Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 100.00% Ìý Ìý Ìý Ìý Ìý
Equity Method Investment, Other than Temporary Impairment Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý $ 67,600,000 $ 365,400,000 Ìý Ìý Ìý Ìý
Proceeds from sale of economic interest (in AUD) Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 4.00 Ìý Ìý Ìý Ìý 141,000,000 Ìý
Estimated rehabilitation costs Ìý Ìý Ìý Ìý Ìý Ìý Ìý $ 18,600,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
[1] At December 31, 2012 our ownership interest percentage for Cockatoo was 50 percent.