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