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SEGMENT REPORTING (Schedule Of Segment Reporting Information, By Segment) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Revenues from product sales and services $ 1,515.8 $ 1,546.6 $ 1,488.5 $ 1,140.5 $ 1,535.9 $ 1,544.9 $ 1,579.5 $ 1,212.4 $ 5,691.4 $ 5,872.7 $ 6,563.9
Revenues from producet sales and services, percent                 100.00% 100.00% 100.00%
SALES MARGIN 294.5 348.7 268.2 237.9 238.5 198.3 443.5 291.8 1,149.3 1,172.1 2,610.9
Other operating expense                 (478.3) (1,480.9) (314.1)
Other expense                 (181.7) (193.0) (106.3)
Income (loss) from continuing operations before income taxes and equity income (loss) from ventures                 489.3 (501.8) 2,190.5
Depreciation, depletion and amortization                 593.3 525.8 426.9
Capital Additions                 752.3 [1] 1,335.3 [1] 960.9 [1]
U.S. Iron Ore [Member]
                     
Segment Reporting Information [Line Items]                      
Revenues from product sales and services                 2,667.9 2,723.3 3,509.9
Revenues from producet sales and services, percent                 47.00% 46.00% 53.00%
SALES MARGIN                 901.9 976.2 1,679.3
Depreciation, depletion and amortization                 120.3 100.9 86.2
Capital Additions                 53.3 [1] 168.8 [1] 191.4 [1]
Eastern Canadian Iron Ore [Member]
                     
Segment Reporting Information [Line Items]                      
Revenues from product sales and services                 978.7 1,008.9 1,178.1
Revenues from producet sales and services, percent                 17.00% 17.00% 18.00%
SALES MARGIN                 (103.3) (121.4) 290.9
Depreciation, depletion and amortization                 178.5 160.2 124.6
Capital Additions                 625.5 [1] 865.2 [1] 303.1 [1]
Asia Pacific Iron Ore [Member]
                     
Segment Reporting Information [Line Items]                      
Revenues from product sales and services                 1,224.3 1,259.3 1,363.5
Revenues from producet sales and services, percent                 22.00% 22.00% 21.00%
SALES MARGIN                 367.1 311.0 699.5
Depreciation, depletion and amortization                 153.7 151.9 100.9
Capital Additions                 13.0 [1] 87.7 [1] 262.0 [1]
North American Coal [Member]
                     
Segment Reporting Information [Line Items]                      
Revenues from product sales and services                 821.9 881.1 512.1
Revenues from producet sales and services, percent                 14.00% 15.00% 8.00%
SALES MARGIN                 (14.5) (1.8) (58.4)
Depreciation, depletion and amortization                 128.9 98.2 86.5
Capital Additions                 55.0 [1] 144.1 [1] 181.0 [1]
All Other Segments [Member]
                     
Segment Reporting Information [Line Items]                      
Revenues from product sales and services                 (1.4) 0.1 0.3
Revenues from producet sales and services, percent                 0.00% 0.00% 0.00%
SALES MARGIN                 (1.9) 8.1 (0.4)
Depreciation, depletion and amortization                 11.9 14.6 28.7
Capital Additions                 $ 5.5 [1] $ 69.5 [1] $ 23.4 [1]
[1] Includes capital lease additions and non-cash accruals. Refer to NOTE 21 - CASH FLOW INFORMATION.