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Annual report pursuant to Section 13 and 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 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Empire [Member]
Dec. 31, 2011
Empire [Member]
Dec. 31, 2002
Empire [Member]
Dec. 31, 2002
Prior [Member]
Empire [Member]
Dec. 31, 2002
Current [Member]
Empire [Member]
Dec. 31, 2012
Other Current Assets [Member]
Empire [Member]
Dec. 31, 2011
Other Current Assets [Member]
Empire [Member]
Dec. 31, 2012
U.S. Iron Ore [Member]
Dec. 31, 2011
U.S. Iron Ore [Member]
Dec. 31, 2012
Amapa [Member]
Dec. 31, 2012
Wabush [Member]
Dec. 31, 2012
Wabush [Member]
Fair Value, Assets And Liabilities Components [Line Items] 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Transfer of derivative assets from level 3 to level 2 听 $ 20.0 $ 0 $ 20.0 听 听 听 听 听 听 听 听 听 听 听 听
Transfer of derivative assets from level 2 to level 3 49.0 听 0 49.0 听 听 听 听 听 听 听 听 听 听 听 听
Management Estimate of 62% Fe 听 听 62.00% 听 听 听 听 听 听 听 听 听 听 听 听 听
Maximum deferred portion of supplemental payments 听 听 听 听 听 听 听 听 听 听 听 22.3 听 听 听 听
Supply agreement, customer receivable, stated interest rate 听 听 9.00% 听 听 听 听 听 听 听 听 听 听 听 听 听
Supply agreement, customer receivable, description of variable rate basis 听 听 prime rate 听 听 听 听 听 听 听 听 听 听 听 听 听
Other current assets 166.3 听 216.2 166.3 听 听 听 听 听 听 听 听 22.3 听 听 听
Supply agreement, customer receivable, basis spread on variable rate 听 听 3.50% 听 听 听 听 听 听 听 听 听 听 听 听 听
Other non-current assets 191.2 听 193.6 191.2 听 听 听 听 听 听 听 听 22.3 听 听 听
Fair value of the receivable 听 听 听 听 21.3 30.7 听 听 听 听 听 21.3 20.8 听 听 听
Estimated credit-adjusted risk-free interest rate 听 听 听 听 2.85% 2.58% 听 听 听 听 听 2.81% 4.50% 听 听 听
Interest Percentage 听 听 听 听 听 听 听 46.70% 听 听 听 听 听 听 听 听
Equity Method Investments, Fair Value Disclosure 听 听 听 听 听 听 听 听 听 听 听 听 听 72.5 听 听
Percent ownership interest after transaction 听 听 听 听 听 听 听 听 79.00% 听 听 听 听 听 听 听
Long term accounts notes and loans receivable net noncurrent 听 听 听 听 19.3 26.5 120.0 听 听 10.0 10.0 听 听 听 听 听
Goodwill impairment 听 听 1,000.0 27.8 听 听 听 听 听 听 听 听 听 听 2.7 2.7
Impairment of long-lived assets 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 $ 49.9