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Acquisitions And Other Investments (Schedule Of Unaudited Consolidated Proforma Information) (Detail) (Consolidated Thompson [Member], USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 9 Months Ended |
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Sep. 30, 2011
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Sep. 30, 2011
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Consolidated Thompson [Member]
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| Business Acquisition [Line Items] | ||
| REVENUES FROM PRODUCT SALES AND SERVICES | $ 2,089.1 | $ 5,168.6 |
| NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | $ 607.3 | $ 1,439.2 |
| EARNINGS PER COMMON SHARE ATTRIBUTABLE TO CLIFFS SHAREHOLDERS - BASIC | $ 4.21 | $ 10.31 |
| EARNINGS PER COMMON SHARE ATTRIBUTABLE TO CLIFFS SHAREHOLDERS - DILUTED | $ 4.19 | $ 10.26 |
| X | ||||||||||
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- Details
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| 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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