|
Segment Reporting (Schedule Of Segment Reporting Information, By Segment) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2011
|
Sep. 30, 2011
|
Jun. 30, 2011
|
Mar. 31, 2011
|
Dec. 31, 2010
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Sep. 30, 2010
|
Jun. 30, 2010
|
Mar. 31, 2010
|
Sep. 30, 2011
|
Dec. 31, 2011
|
Dec. 31, 2010
|
Dec. 31, 2009
|
|
| Percentage of revenues from product sales and services | 100.00% | 100.00% | 100.00% | |||||||||
| Revenues from product sales and services | $ 1,662.5 | $ 2,142.8 | $ 1,805.8 | $ 1,183.2 | $ 1,424.1 | $ 1,346.0 | $ 1,184.3 | $ 727.7 | $ 6,794.3 | $ 4,682.1 | $ 2,342.0 | |
| Sales margin | 496.2 | 861.3 | 731.6 | 599.5 | 483.5 | 477.3 | 415.2 | 150.5 | 2,688.6 | 1,526.5 | 311.7 | |
| Other operating expense | (340.0) | (256.3) | (75.6) | |||||||||
| Other income (expense) | (107.1) | 32.8 | 60.4 | |||||||||
| INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY INCOME (LOSS) FROM VENTURES | 16.1 | 2,241.5 | 1,303.0 | 296.5 | ||||||||
| Depreciation, depletion and amortization | 426.9 | 322.3 | 236.6 | |||||||||
| Capital additions | 960.9 | 275.8 | 168.2 | |||||||||
| TOTAL ASSETS | 14,541.7 | 7,778.2 | 14,541.7 | 7,778.2 | ||||||||
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Operating Segments [Member]
|
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| TOTAL ASSETS | 14,008.1 | 6,243.6 | 14,008.1 | 6,243.6 | ||||||||
|
U.S. Iron Ore [Member]
|
||||||||||||
| Percentage of revenues from product sales and services | 52.00% | 52.00% | 52.00% | |||||||||
| Revenues from product sales and services | 3,509.9 | 2,443.7 | 1,211.6 | |||||||||
| Sales margin | 1,679.3 | 788.4 | 213.2 | |||||||||
| Depreciation, depletion and amortization | 86.2 | 61.7 | 67.4 | |||||||||
| Capital additions | 191.4 | 84.7 | 42.6 | |||||||||
| TOTAL ASSETS | 1,691.8 | 1,537.1 | 1,691.8 | 1,537.1 | ||||||||
|
Eastern Canadian Iron Ore [Member]
|
||||||||||||
| Percentage of revenues from product sales and services | 17.00% | 10.00% | 10.00% | |||||||||
| Revenues from product sales and services | 1,178.1 | 477.7 | 236.2 | |||||||||
| Sales margin | 290.9 | 133.6 | 62.3 | |||||||||
| Depreciation, depletion and amortization | 124.6 | 41.9 | 6.9 | |||||||||
| Capital additions | 303.1 | 18.8 | ||||||||||
| TOTAL ASSETS | 7,973.1 | 629.6 | 7,973.1 | 629.6 | ||||||||
|
North American Coal [Member]
|
||||||||||||
| Percentage of revenues from product sales and services | 8.00% | 9.00% | 9.00% | |||||||||
| Revenues from product sales and services | 512.1 | 438.2 | 207.2 | |||||||||
| Sales margin | (58.4) | (28.6) | (71.9) | |||||||||
| Depreciation, depletion and amortization | 86.5 | 60.4 | 38.2 | |||||||||
| Capital additions | 181.0 | 89.5 | 20.8 | |||||||||
| TOTAL ASSETS | 1,814.4 | 1,623.8 | 1,814.4 | 1,623.8 | ||||||||
|
Asia Pacific Iron Ore [Member]
|
||||||||||||
| Percentage of revenues from product sales and services | 20.00% | 24.00% | 23.00% | |||||||||
| Revenues from product sales and services | 1,363.5 | 1,123.9 | 542.1 | |||||||||
| Sales margin | 699.5 | 566.2 | 87.2 | |||||||||
| Depreciation, depletion and amortization | 100.9 | 133.9 | 110.6 | |||||||||
| Capital additions | 262.0 | 53.6 | 96.2 | |||||||||
| TOTAL ASSETS | 1,511.2 | 1,195.3 | 1,511.2 | 1,195.3 | ||||||||
|
Other Segment [Member]
|
||||||||||||
| Percentage of revenues from product sales and services | 3.00% | 4.00% | 6.00% | |||||||||
| Revenues from product sales and services | 230.7 | 198.6 | 144.9 | |||||||||
| Sales margin | 77.3 | 66.9 | 20.9 | |||||||||
| Depreciation, depletion and amortization | 28.7 | 24.4 | 13.5 | |||||||||
| Capital additions | 23.4 | 29.2 | 8.6 | |||||||||
| TOTAL ASSETS | 1,017.6 | 1,257.8 | 1,017.6 | 1,257.8 | ||||||||
|
Material Reconciling Items [Member]
|
||||||||||||
| TOTAL ASSETS | $ 533.6 | $ 1,534.6 | $ 533.6 | $ 1,534.6 | ||||||||