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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
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 $ 1,100.8 $ 1,488.5 $ 2,040.8 $ 2,629.0
Sales Margin 92.0 268.2 155.2 506.1
Other operating expense (103.7) (6.2) (217.6) (75.8)
Other expense (42.6) (43.5) (84.1) (91.5)
Income from Continuing Operations before income taxes and equity (loss) from ventures (54.3) 218.5 (146.5) 338.8
Depreciation, depletion and amortization 145.3 144.3 286.4 284.9
Capital Additions 52.0 [1] 218.1 [1] 131.2 [1] 413.8 [1]
U.S. Iron Ore [Member]
       
Segment Reporting Information [Line Items]        
Revenues from producet sales and services, percent 47.00% 47.00% 43.00% 42.00%
Revenues from product sales and services 514.6 701.7 875.9 1,111.8
Sales Margin 147.2 216.3 242.2 373.6
Depreciation, depletion and amortization 26.6 28.4 55.3 55.0
Capital Additions 14.0 [1] 12.2 [1] 28.9 [1] 23.9 [1]
Eastern Canadian Iron Ore [Member]
       
Segment Reporting Information [Line Items]        
Revenues from producet sales and services, percent 16.00% 14.00% 16.00% 17.00%
Revenues from product sales and services 174.0 213.9 332.3 459.2
Sales Margin (38.5) (49.7) (88.2) (30.3)
Depreciation, depletion and amortization 42.4 42.4 83.6 83.5
Capital Additions 23.1 [1] 186.8 [1] 74.1 [1] 353.8 [1]
Asia Pacific Iron Ore [Member]
       
Segment Reporting Information [Line Items]        
Revenues from producet sales and services, percent 21.00% 22.00% 24.00% 23.00%
Revenues from product sales and services 233.1 327.0 487.3 597.8
Sales Margin 36.0 95.0 102.3 156.3
Depreciation, depletion and amortization 42.3 41.7 81.4 78.1
Capital Additions 2.0 [1] 2.3 [1] 5.2 [1] 6.6 [1]
North American Coal [Member]
       
Segment Reporting Information [Line Items]        
Revenues from producet sales and services, percent 16.00% 17.00% 17.00% 18.00%
Revenues from product sales and services 179.1 245.9 345.3 460.2
Sales Margin (52.7) 6.6 (101.1) 8.4
Depreciation, depletion and amortization 32.0 28.4 61.9 60.9
Capital Additions 11.0 [1] 15.7 [1] 20.2 [1] 26.8 [1]
All Other Segments [Member]
       
Segment Reporting Information [Line Items]        
Sales Margin 0 0 0 (1.9)
Depreciation, depletion and amortization 2.0 3.4 4.2 7.4
Capital Additions $ 1.9 [1] $ 1.1 [1] $ 2.8 [1] $ 2.7 [1]
[1] Includes capital lease additions and non-cash accruals. Refer to NOTE 19 - CASH FLOW INFORMATION.