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Segment Reporting (Schedule Of Segment Reporting Information, By Segment) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Percentage of revenues from product sales and services100.00%100.00%100.00%100.00%
Revenues from product sales and services$ 2,142.8$ 1,346.0$ 5,131.8$ 3,257.9
Sales margin863.3477.22,194.91,042.6
Other operating expense(43.0)(86.8)(214.2)(170.9)
Other income (expense)(54.8)20.2(61.8)39.8
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY INCOME FROM VENTURES765.5410.61,918.9911.5
Depreciation, depletion and amortization117.784.4302.9239.5
Capital additions255.9[1]83.5[1]553.3[1]154.2[1]
U.S. Iron Ore [Member]
    
Percentage of revenues from product sales and services52.00%55.00%49.00%53.00%
Revenues from product sales and services1,106.7741.42,502.01,729.8
Sales margin481.3264.21,283.7545.5
Depreciation, depletion and amortization23.017.662.545.1
Capital additions28.5[1]32.7[1]115.8[1]59.9[1]
Eastern Canadian Iron Ore [Member]
    
Percentage of revenues from product sales and services24.00%9.00%18.00%9.00%
Revenues from product sales and services517.3124.4942.2308.1
Sales margin193.039.6296.076.3
Depreciation, depletion and amortization41.210.681.136.2
Capital additions103.3[1]4.8[1]167.5[1]9.4[1]
North American Coal [Member]
    
Percentage of revenues from product sales and services3.00%9.00%8.00%10.00%
Revenues from product sales and services64.0126.1388.7323.4
Sales margin(42.7)(17.8)(60.4)(5.4)
Depreciation, depletion and amortization19.719.662.142.6
Capital additions60.3[1]28.1[1]116.3[1]42.0[1]
Asia Pacific Iron Ore [Member]
    
Percentage of revenues from product sales and services19.00%22.00%22.00%24.00%
Revenues from product sales and services400.1298.21,127.1767.1
Sales margin214.6169.7615.4382.5
Depreciation, depletion and amortization25.431.074.397.2
Capital additions57.3[1]10.4[1]140.6[1]30.6[1]
Other Segment [Member]
    
Percentage of revenues from product sales and services2.00%5.00%3.00%4.00%
Revenues from product sales and services54.755.9171.8129.5
Sales margin17.121.560.243.7
Depreciation, depletion and amortization8.45.622.918.4
Capital additions$ 6.5[1]$ 7.5[1]$ 13.1[1]$ 12.3[1]
[1]Includes capital lease additions and non-cash accruals.