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Quarterly report pursuant to Section 13 or 15(d)

Fair Value Of Financial Instruments (Narrative) (Details)

v2.3.0.15
Fair Value Of Financial Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2009
Jun. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Dec. 31, 2010
Empire [Member]
Sep. 30, 2011
Empire [Member]
Dec. 31, 2002
Empire [Member]
Dec. 31, 2010
U.S. Iron Ore [Member]
Dec. 31, 2013
U.S. Iron Ore [Member]
Sep. 30, 2011
U.S. Iron Ore [Member]
Financial assets or liabilities measured at fair value on a non-recurring basis Ìý Ìý Ìý Ìý Ìý $ 0 Ìý Ìý Ìý Ìý Ìý Ìý
Fair value transfers amount between Level 1 and Level 2 Ìý Ìý Ìý 0 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Interest rate on long term receivable 9 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Percent ownership interest Ìý Ìý Ìý Ìý Ìý Ìý 79.00% Ìý 46.70% Ìý Ìý Ìý
Transfers out of Level 3 Ìý Ìý 161.8 20.0 161.8 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Long-term receivables Ìý Ìý Ìý Ìý Ìý Ìý 32.8 28.1 120.0 22.3 22.3 22.3
Fair value of the receivable Ìý Ìý Ìý Ìý Ìý Ìý 38.9 32.7 Ìý 19.5 Ìý 20.5
Estimated credit-adjusted risk-free interest rate Ìý Ìý Ìý Ìý Ìý Ìý 3.10% Ìý Ìý 4.70% Ìý Ìý
Basis points 350 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, transfers out of Level 3 Ìý $ 20.0 $ (161.8) Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý