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Quarterly report pursuant to Section 13 or 15(d)

Acquisitions And Other Investments (Consolidated Thompson Pro Forma Information) (Details)

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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 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Consolidated Thompson [Member]
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Revenues from product sales and services $ 2,142.8 $ 1,487.5 $ 5,340.2 $ 3,435.2
Net income attributable to Cliffs shareholders $ 595.6 $ 315.2 $ 1,426.2 $ 515.5
Earnings per common share attributable to Cliffs shareholders - Basic $ 4.13 $ 2.33 $ 10.22 $ 3.81
Earnings per common share attributable to Cliffs shareholders - Diluted $ 4.11 $ 2.31 $ 10.16 $ 3.79