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Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Investments In Unconsolidated Ventures) (Details)

v2.4.0.8
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Investments In Unconsolidated Ventures) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Investment $ 68.7 $ 108.4
Amapa [Member] | Investments In Ventures [Member]
Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Ownership interest, equity method investment 30.00% Ìý
Total percentage of Amapa sold 100.00% Ìý
Investment 29.4 101.9
Cockatoo [Member] | Other Liabilities [Member]
Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Ownership interest, equity method investment 0.00% [1] 50.00% [1]
Investment Ìý (25.3) [1]
Hibbing [Member] | Investments In Ventures [Member]
Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Investment 6.4 [2] Ìý
Hibbing [Member] | Other Liabilities [Member]
Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Investment Ìý (2.1) [2]
Other Equity Investees [Member] | Investments In Ventures [Member]
Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Investment $ 32.9 $ 33.9
Hibbing [Member] | Hibbing [Member] | Investments In Ventures [Member]
Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Ownership interest, equity method investment 23.00% [2] Ìý
[1] At December 31, 2012 our ownership interest percentage for Cockatoo was 50 percent.
[2] At December 31, 2012 the classification for Hibbing was Other liabilities.