Quarterly report pursuant to Section 13 or 15(d)

SEGMENT REPORTING (Schedule Of Segment Reporting Information, By Segment) (Details)

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SEGMENT REPORTING (Schedule Of Segment Reporting Information, By Segment) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting Information [Line Items]        
Revenues from producet sales and services, percent 100.00% 100.00% 100.00% 100.00%
Revenues from product sales and services $ 1,546.6 $ 1,544.9 $ 4,175.6 $ 4,336.8
Sales Margin 348.7 198.3 854.8 933.6
Other operating expense (124.7) (122.0) (200.5) (272.3)
Other expense (45.9) (43.9) (137.4) (134.7)
Income from Continuing Operations before income taxes and equity (loss) from ventures 178.1 32.4 516.9 526.6
Depreciation, depletion and amortization 153.1 132.9 438.0 382.3
Capital Additions 211.3 [1] 354.5 [1] 625.1 [1] 974.0 [1]
U.S. Iron Ore [Member]
       
Segment Reporting Information [Line Items]        
Revenues from producet sales and services, percent 51.00% 52.00% 45.00% 45.00%
Revenues from product sales and services 782.4 796.0 1,894.2 1,942.7
Sales Margin 273.5 255.9 647.1 708.9
Depreciation, depletion and amortization 27.3 24.9 82.3 71.9
Capital Additions 15.2 [1] 19.6 [1] 39.1 [1] 82.5 [1]
Eastern Canadian Iron Ore [Member]
       
Segment Reporting Information [Line Items]        
Revenues from producet sales and services, percent 18.00% 16.00% 18.00% 18.00%
Revenues from product sales and services 284.2 253.1 743.4 777.8
Sales Margin (22.0) (40.5) (52.3) (43.0)
Depreciation, depletion and amortization 46.8 41.7 130.3 118.2
Capital Additions 181.5 [1] 285.5 [1] 535.3 [1] 593.4 [1]
Asia Pacific Iron Ore [Member]
       
Segment Reporting Information [Line Items]        
Revenues from producet sales and services, percent 20.00% 16.00% 22.00% 22.00%
Revenues from product sales and services 301.7 254.2 899.5 975.3
Sales Margin 99.0 (15.8) 255.3 256.1
Depreciation, depletion and amortization 38.0 40.2 116.1 110.0
Capital Additions 2.0 [1] 5.8 [1] 8.6 [1] 132.0 [1]
North American Coal [Member]
       
Segment Reporting Information [Line Items]        
Revenues from producet sales and services, percent 11.00% 16.00% 15.00% 15.00%
Revenues from product sales and services 178.3 241.8 638.5 640.9
Sales Margin (1.8) (1.3) 6.6 3.8
Depreciation, depletion and amortization 38.8 25.1 99.7 69.5
Capital Additions 10.4 [1] 33.3 [1] 37.2 [1] 105.1 [1]
All Other Segments [Member]
       
Segment Reporting Information [Line Items]        
Revenues from producet sales and services, percent 0.00% 0.00% 0.00% 0.00%
Revenues from product sales and services 0 (0.2) 0 0.1
Sales Margin 0 0 (1.9) 7.8
Depreciation, depletion and amortization 2.2 1.0 9.6 12.7
Capital Additions $ 2.2 [1] $ 10.3 [1] $ 4.9 [1] $ 61.0 [1]
[1] Includes capital lease additions and non-cash accruals. Refer to NOTE 20 - CASH FLOW INFORMATION.