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Quarterly report pursuant to Section 13 or 15(d)

Basis Of Presentation And Significant Accounting Policies (Investments In Unconsolidated Venture) (Details)

v2.3.0.15
Basis Of Presentation And Significant Accounting Policies (Investments In Unconsolidated Venture) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2011
Dec. 31, 2010
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Investment $ 511.3 $ 509.0
Other Liabilities [Member] | Cockatoo [Member]
Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Interest Percentage 50.00% [1] Ìý
Investment (4.5) [1] 10.5 [1]
Amapa [Member] | Investments In Ventures [Member]
Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Interest Percentage 30.00% Ìý
Investment 489.0 461.3
Investments In Ventures [Member] | AusQuest [Member]
Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Interest Percentage 30.00% Ìý
Investment 5.7 24.1
Investments In Ventures [Member] | Hibbing [Member]
Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Interest Percentage 23.00% [2] Ìý
Investment 2.1 [2] (5.8) [2]
Investments In Ventures [Member] | Other Equity Investees [Member]
Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Investment $ 19.0 $ 18.9
[1] Recorded as Investments in ventures at December 31, 2010.
[2] Recorded as Other liabilities at December 31, 2010.