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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)

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Basis of Presentation and Significant Accounting Policies (Investments in Unconsolidated Venture) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2011
Dec. 31, 2010
Investment $ 507.6 $ 509.0
Other Liabilities [Member] | Hibbing [Member]
Ìý Ìý
Interest Percentage 23.00% Ìý
Investment (1.8) (5.8)
Investments in Ventures [Member] | Amapa [Member]
Ìý Ìý
Interest Percentage 30.00% Ìý
Investment 476.7 461.3
Investments in Ventures [Member] | AusQuest [Member]
Ìý Ìý
Interest Percentage 30.00% Ìý
Investment 7.3 24.1
Investments in Ventures [Member] | Cockatoo [Member]
Ìý Ìý
Interest Percentage 50.00% Ìý
Investment 6.1 10.5
Investments in Ventures [Member] | Other Equity Investees [Member]
Ìý Ìý
Investment $ 19.3 $ 18.9