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Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Investments In Unconsolidated Ventures) (Details)

v2.4.0.8
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Investments In Unconsolidated Ventures) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Investment $ 43.6 $ 30.8
Other Noncurrent Liabilities [Member] | Hibbing [Member]
Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Investment Ìý (3.9) [1]
Other Noncurrent Assets [Member] | Hibbing [Member]
Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Ownership interest, equity method investment 23.00% [1] Ìý
Investment 9.5 [1] Ìý
Other Noncurrent Assets [Member] | Other Equity Investees [Member]
Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Investment $ 34.1 $ 34.7
[1] At December 31, 2013, the classification for Hibbing was Other liabilities.