Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Schedule Of Goodwill) (Details)

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9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Goodwill [Roll Forward]    
Beginning Balance $ 2.0 $ 74.5
Impairment 0.0 (73.5)
Impact of foreign currency translation 0.0 1.0
Ending Balance 2.0 2.0
Accumulated goodwill impairment loss (73.5) (73.5)
U.S. Iron Ore [Member]    
Goodwill [Roll Forward]    
Beginning Balance 2.0 2.0
Impairment 0.0 0.0
Impact of foreign currency translation 0.0 0.0
Ending Balance 2.0 2.0
Accumulated goodwill impairment loss 0.0 0.0
Asia Pacific Iron Ore [Member]    
Goodwill [Roll Forward]    
Beginning Balance 0.0 72.5
Impairment 0.0 (73.5)
Impact of foreign currency translation 0.0 1.0
Ending Balance 0.0 0.0
Accumulated goodwill impairment loss $ (73.5) $ (73.5)