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Business Summary And Significant Accounting Policies (Reimbursements Revenue Disclosure) (Details) (U.S. Iron Ore [Member], USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Reimbursement revenue | $ 224.3 | $ 223.4 | $ 93.7 |
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Shipping Handling And Transportation Costs [Member]
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| Reimbursement revenue | 128.4 | 83.6 | 22.4 |
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Co Venturer [Member]
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| Reimbursement revenue | $ 95.9 | $ 139.8 | $ 71.3 |
| X | ||||||||||
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- Definition
Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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