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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Revenue Reimbursement) (Details) (U.S. Iron Ore [Member], USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Reimbursement Revenue | $ 259.5 | $ 250.8 | $ 224.3 |
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Freight Revenue [Member]
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| Reimbursement Revenue | 177.3 | 142.0 | 128.4 |
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Co-venturer [Member]
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| Reimbursement Revenue | $ 82.2 | $ 108.8 | $ 95.9 |
| 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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