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Annual report pursuant to Section 13 and 15(d)

RELATED PARTIES (Narrative) (Details)

v2.4.0.6
RELATED PARTIES (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2002
Segment Reporting Information [Line Items] Ìý Ìý Ìý
Accounts receivable and derivative assets related parties $ 149.8 $ 180.4 Ìý
Other current liabilities related parties 20.2 43.0 Ìý
U.S. Iron Ore [Member]
Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý
Number of mines (in number of facilities) 5 Ìý Ìý
Eastern Canadian Iron Ore [Member]
Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý
Number of mines (in number of facilities) 2 Ìý Ìý
Joint Venture Partners [Member] | U.S. Iron Ore [Member]
Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý
Number of mines (in number of facilities) 3 Ìý Ìý
Joint Venture Partners [Member] | Eastern Canadian Iron Ore [Member]
Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý
Number of mines (in number of facilities) 1 Ìý Ìý
Empire [Member]
Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý
Long term accounts notes and loans receivable net noncurrent 19.3 26.5 120.0
Life of supply agreement (in years) 12 years Ìý Ìý
Prior [Member] | Empire [Member]
Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý
Percent ownership interest before transaction Ìý Ìý 46.70%
Current [Member] | Empire [Member]
Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý
Percent ownership interest after transaction Ìý Ìý 79.00%
Other Non-current Assets [Member] | Empire [Member]
Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý
Present value of other non-current assets $ 9.3 $ 16.5 Ìý