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Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS (Narrative) (Details)

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FAIR VALUE OF FINANCIAL INSTRUMENTS (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
Empire [Member]
Dec. 31, 2012
Empire [Member]
Dec. 31, 2002
Empire [Member]
Dec. 31, 2002
Prior [Member]
Empire [Member]
Dec. 31, 2002
Current [Member]
Empire [Member]
Mar. 31, 2013
Other Current Assets [Member]
Empire [Member]
Dec. 31, 2012
Other Current Assets [Member]
Empire [Member]
Mar. 31, 2013
U.S. Iron Ore [Member]
Dec. 31, 2012
U.S. Iron Ore [Member]
Dec. 31, 2012
Amapa [Member]
Dec. 31, 2012
Equity Method Investments [Member]
Amapa [Member]
Mar. 31, 2013
Equity Method Investments [Member]
Amapa [Member]
Fair Value, Assets And Liabilities Components [Line Items]
Transfer of derivative assets from level 3 to level 2 $ 0 $ 0
Transfer of derivative assets from level 2 to level 3 0 0
Management Estimate of 62% Fe 62.00%
Maximum deferred portion of supplemental payments 22.3
Supply agreement, customer receivable, stated interest rate 9.00%
Supply agreement, customer receivable, description of variable rate basis prime rate
Other current assets 297.9 321.6 16.7 22.3
Supply agreement, customer receivable, basis spread on variable rate 3.50%
Fair value of the receivable 19.1 21.3 16.1 21.3
Estimated credit-adjusted risk-free interest rate 2.24% 2.85% 2.14% 2.81%
Interest Percentage 46.70% 30.00%
Equity Method Investments, Fair Value Disclosure 72.5
Percent ownership interest after transaction 79.00%
Long term accounts notes and loans receivable net noncurrent 17.4 19.3 120.0 10.0 10.0
Impairment of equity method investment $ 365.4