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ACQUISITIONS (Schedule Of Unaudited Consolidated Proforma Information) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
12 Months Ended | ||||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2011
Consolidated Thompson [Member]
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Dec. 31, 2010
Consolidated Thompson [Member]
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| Business Acquisition [Line Items] | |||||
| Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | $ 361.8 | $ (1,126.6) | $ 1,812.6 | ||
| REVENUES FROM PRODUCT SALES AND SERVICES | 6,772.3 | 4,784.6 | |||
| NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | $ 1,612.3 | $ 912.5 | |||
| EARNINGS (LOSS) PER COMMON SHARE ATTRIBUTABLE TO CLIFFS SHAREHOLDERS - BASIC | $ 11.50 | $ 6.74 | |||
| EARNINGS (LOSS) PER COMMON SHARE ATTRIBUTABLE TO CLIFFS SHAREHOLDERS - DILUTED | $ 11.43 | $ 6.70 | |||
| 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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| X | ||||||||||
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- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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