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Basis of Presentation and Significant Accounting Policies (Significant Consolidated Subsidiaries) (Details)
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6 Months Ended | ||
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Jun. 30, 2011
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Dec. 31, 2010
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Dec. 31, 2002
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Northshore [Member]
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| Location | Minnesota | ||
| Ownership Interest | 100.00% | ||
| Operation | Iron Ore | ||
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United Taconite [Member]
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| Location | Minnesota | ||
| Ownership Interest | 100.00% | ||
| Operation | Iron Ore | ||
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Wabush [Member]
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| Location | Labrador/Quebec, Canada | ||
| Ownership Interest | 100.00% | ||
| Operation | Iron Ore | ||
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Bloom Lake [Member]
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| Location | Quebec, Canada | ||
| Ownership Interest | 75.00% | ||
| Operation | Iron Ore | ||
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Tilden [Member]
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| Location | Michigan | ||
| Ownership Interest | 85.00% | ||
| Operation | Iron Ore | ||
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Empire [Member]
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| Location | Michigan | ||
| Ownership Interest | 79.00% | 79.00% | 46.70% |
| Operation | Iron Ore | ||
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Asia Pacific Iron Ore [Member]
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| Location | Western Australia | ||
| Ownership Interest | 100.00% | ||
| Operation | Iron Ore | ||
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Pinnacle [Member]
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| Location | West Virginia | ||
| Ownership Interest | 100.00% | ||
| Operation | Coal | ||
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Oak Grove [Member]
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| Location | Alabama | ||
| Ownership Interest | 100.00% | ||
| Operation | Coal | ||
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CLCC [Member]
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| Location | West Virginia | ||
| Ownership Interest | 100.00% | ||
| Operation | Coal | ||
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renewaFUEL [Member]
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| Location | Michigan | ||
| Ownership Interest | 95.00% | ||
| Operation | Biomass | ||
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Freewest [Member]
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| Location | Ontario, Canada | ||
| Ownership Interest | 100.00% | ||
| Operation | Chromite | ||
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Spider [Member]
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| Location | Ontario, Canada | ||
| Ownership Interest | 100.00% | ||
| Operation | Chromite |