Annual report pursuant to Section 13 and 15(d)

GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Narrative) (Details)

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GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Cost Of Goods Sold And Operating Expenses [Member]
Dec. 31, 2011
Cost Of Goods Sold And Operating Expenses [Member]
Dec. 31, 2010
Cost Of Goods Sold And Operating Expenses [Member]
Dec. 31, 2012
Product Revenues [Member]
Dec. 31, 2011
Product Revenues [Member]
Dec. 31, 2010
Product Revenues [Member]
Dec. 31, 2012
CQIM Reporting Unit [Member]
Dec. 31, 2012
Wabush [Member]
Dec. 31, 2012
Wabush [Member]
Impairment of goodwill $ 1,000.0 $ 27.8                   $ 997.3 $ 2.7 $ 2.7
Amortization expense relating to intangible assets           22.5 17.7 18.8            
Below-market sales contracts, remaining contract life       1 year 4 years                  
Product revenues $ 5,520.9 $ 6,321.3 $ 4,218.5           $ 46.3 $ 57.0 $ 62.4