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QUARTERLY RESULTS OF OPERATIONS (Schedule of Quarterly Financial Information) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
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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, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Quarterly Financial Information Disclosure [Abstract] | |||||||||||
| Revenues from product sales and services | $ 1,535.9 | $ 1,544.9 | $ 1,579.5 | $ 1,212.4 | $ 1,603.7 | $ 2,089.1 | $ 1,723.2 | $ 1,147.9 | $ 5,872.7 | $ 6,563.9 | $ 4,483.8 |
| Sales margin | 238.5 | 198.3 | 443.5 | 291.8 | 480.1 | 843.1 | 699.2 | 588.5 | 1,172.1 | 2,610.9 | 1,458.7 |
| Net Income (Loss) from Continuing Operations attributable to Cliffs shareholders | (1,649.1) | 87.8 | 255.7 | 370.3 | 168.9 | 618.0 | 392.8 | 419.3 | (935.3) | 1,599.0 | 997.4 |
| Income (Loss) and Gain on Sale from Discontinued Operations, net of tax | 30.8 | (2.7) | 2.3 | 5.5 | 16.5 | (16.8) | 16.3 | 4.1 | 35.9 | 20.1 | 22.5 |
| NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | $ (1,618.3) | $ 85.1 | $ 258.0 | $ 375.8 | $ 185.4 | $ 601.2 | $ 409.1 | $ 423.4 | $ (899.4) | $ 1,619.1 | $ 1,019.9 |
| Earnings (loss) per Common Share Attributable to Cliffs Shareholders - Basic: | |||||||||||
| Continuing operations (in usd per share) | $ (11.58) | $ 0.62 | $ 1.79 | $ 2.60 | $ 1.19 | $ 4.29 | $ 2.82 | $ 3.09 | $ (6.57) | $ 11.41 | $ 7.37 |
| Discontinued operations (in usd per share) | $ 0.22 | $ (0.02) | $ 0.02 | $ 0.04 | $ 0.11 | $ (0.12) | $ 0.12 | $ 0.03 | $ 0.25 | $ 0.14 | $ 0.17 |
| Earnings per common share attributable to Cliffs shareholders - Basic (in usd per share) | $ (11.36) | $ 0.60 | $ 1.81 | $ 2.64 | $ 1.30 | $ 4.17 | $ 2.94 | $ 3.12 | $ (6.32) | $ 11.55 | $ 7.54 |
| Earnings (loss) per Common Share Attributable to Cliffs Shareholders - Diluted: | |||||||||||
| Continuing operations (in usd per share) | $ (11.58) | $ 0.61 | $ 1.79 | $ 2.59 | $ 1.18 | $ 4.27 | $ 2.80 | $ 3.08 | $ (6.57) | $ 11.34 | $ 7.32 |
| Discontinued operations (in usd per share) | $ 0.22 | $ (0.02) | $ 0.02 | $ 0.04 | $ 0.12 | $ (0.12) | $ 0.12 | $ 0.03 | $ 0.25 | $ 0.14 | $ 0.17 |
| Earnings per common share attributable to Cliffs shareholders - Diluted (in usd per share) | $ (11.36) | $ 0.59 | $ 1.81 | $ 2.63 | $ 1.30 | $ 4.15 | $ 2.92 | $ 3.11 | $ (6.32) | $ 11.48 | $ 7.49 |
| X | ||||||||||
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- Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of net income (loss) derived from discontinued operations during the period, net of related tax effect, per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of net income or loss derived from discontinued operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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