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Acquisitions and Other Investments (Consolidated Thompson Pro Forma Information) (Details) (Consolidated Thompson [Member], USD $)
In Millions, except Per Share data |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2011
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Jun. 30, 2010
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Jun. 30, 2011
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Jun. 30, 2010
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Consolidated Thompson [Member]
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| Total Revenues | $ 2,065.0 | $ 1,219.9 | $ 3,343.8 | $ 1,947.4 |
| Net Income | $ 417.0 | $ 206.8 | $ 808.7 | $ 192.6 |
| Earnings per common share attributable to Cliffs shareholders - Basic | $ 3.00 | $ 1.53 | $ 5.89 | $ 1.42 |
| Earnings per common share attributable to Cliffs shareholders - Diluted | $ 2.98 | $ 1.52 | $ 5.86 | $ 1.42 |
| X | ||||||||||
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- Definition
The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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