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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 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| 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] | ||||||||||
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U.S. Iron Ore [Member]
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| 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] | ||||||||||
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Eastern Canadian Iron Ore [Member]
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| 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] | ||||||||||
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Asia Pacific Iron Ore [Member]
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| 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] | ||||||||||
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North American Coal [Member]
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| 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] | ||||||||||
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All Other Segments [Member]
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| 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] | ||||||||||
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