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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
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Dec. 31, 2010
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|---|---|---|
| Investment | $ 507.6 | $ 509.0 |
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Other Liabilities [Member] | Hibbing [Member]
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| Interest Percentage | 23.00% | |
| Investment | (1.8) | (5.8) |
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Investments in Ventures [Member] | Amapa [Member]
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| Interest Percentage | 30.00% | |
| Investment | 476.7 | 461.3 |
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Investments in Ventures [Member] | AusQuest [Member]
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| Interest Percentage | 30.00% | |
| Investment | 7.3 | 24.1 |
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Investments in Ventures [Member] | Cockatoo [Member]
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| Interest Percentage | 50.00% | |
| Investment | 6.1 | 10.5 |
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Investments in Ventures [Member] | Other Equity Investees [Member]
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| Investment | $ 19.3 | $ 18.9 |
| X | ||||||||||
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- Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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