Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.6
Acquisitions And Other Investments (Wabush Purchase Price Allocation) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2010
Wabush [Member]
Scenario, Previously Reported [Member]
Dec. 31, 2010
Wabush [Member]
Scenario, Adjustment [Member]
Feb. 01, 2010
Wabush [Member]
Scenario, Adjustment [Member]
Dec. 31, 2010
Wabush [Member]
Scenario, Change [Member]
Business Acquisition [Line Items]            
Cash     $ 88.0 $ 88.0 $ 88.0  
Working capital adjustments     15.0 15.0 15.0  
Fair value of total consideration transferred     103.0 103.0 103.0  
Fair value of Cliffs' ownership interest in subsidiary held prior to acquisition of remaining interest     39.7 38.0   (1.7)
In-process inventories     21.8 21.8    
Business Acquisiton Purchase Price Allocation Current Assets Supplies and Other Inventory     43.6 43.6    
Other current assets     13.2 13.2    
Mineral rights     85.1 84.4   (0.7)
Plant and equipment     146.3 147.8   1.5
Intangible assets     66.4 66.4    
Other assets     16.3 19.3   3.0
Total identifiable assets acquired     392.7 396.5   3.8
Current liabilities     (48.1) (48.1)    
Pension and OPEB obligations     (80.6) (80.6)    
Mine closure obligations     (39.6) (53.4)   (13.8)
Below- market sales contracts     (67.7) (67.7)    
Deferred taxes 1,041.8   (20.5)     20.5
Other liabilities     (8.9) (8.8)   0.1
Total identifiable liabilities assumed     (265.4) (258.6)   6.8
Total identifiable net assets acquired     127.3 137.9   10.6
Goodwill     15.4 3.1   (12.3)
Total net assets acquired   $ 1.7 $ 142.7 $ 141.0   $ (1.7)