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Quarterly report pursuant to Section 13 or 15(d)

Segment Reporting (Schedule Of Summary Of Assets, By Segment) (Details)

v2.3.0.15
Segment Reporting (Schedule Of Summary Of Assets, By Segment) (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Total assets $ 13,945.3 $ 7,778.2
U.S. Iron Ore [Member]
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Total assets 1,772.2 1,537.1
Eastern Canadian Iron Ore [Member]
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Total assets 7,712.6 629.6
North American Coal [Member]
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Total assets 1,718.9 1,623.8
Asia Pacific Iron Ore [Member]
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Total assets 1,343.1 1,195.3
Other Segment [Member]
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Total assets 1,165.6 1,257.8
Total Segment Assets [Member]
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Total assets 13,712.4 6,243.6
Corporate [Member]
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Total assets $ 232.9 $ 1,534.6