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Quarterly report pursuant to Section 13 or 15(d)

Acquisitions And Other Investments (Wabush Purchase Price Allocation) (Details)

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Acquisitions And Other Investments (Wabush Purchase Price Allocation) (Details) (USD $)
In Millions
Dec. 31, 2010
Dec. 31, 2010
Scenario, Adjustment [Member]
Wabush [Member]
Mar. 31, 2010
Scenario, Previously Reported [Member]
Wabush [Member]
Cash Ìý $ 88.0 Ìý
Working capital adjustments Ìý 15.0 Ìý
Fair value of total consideration transferred Ìý 103.0 Ìý
Fair value of Cliffs' equity interest in acquiree held prior to acquisition of remaining interest Ìý 38.0 39.7
Total net assets acquired $ (1.7) Ìý Ìý