This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References+ Details

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investments accounted for under the equity method of accounting as of the balance sheet date.

+ References+ Details

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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+ Details

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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+ Details

FAIR VALUE OF FINANCIAL INSTRUMENTS FAIR VALUE OF FINANCIAL INSTRUMENTS (Impairment Charges on Financial and Nonfinancial Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended									12 Months Ended				3 Months Ended	12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2012 Amapa [Member]	Dec. 31, 2012 Amapa [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]	Dec. 31, 2012 Amapa [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2012 Amapa [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2012 CQIM Reporting Unit [Member]	Dec. 31, 2012 CQIM Reporting Unit [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]	Dec. 31, 2012 CQIM Reporting Unit [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2012 CQIM Reporting Unit [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2012 Wabush [Member]	Dec. 31, 2012 Wabush [Member]	Dec. 31, 2012 Wabush [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]	Dec. 31, 2012 Wabush [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2012 Wabush [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2012 Equity Method Investments [Member] Amapa [Member]
ASSETS:
Impaired assets, fair value	$ 72.5		$ 0	$ 0	$ 72.5
Property, Plant, and Equipment, Fair Value Disclosure														0	0	0	0	0
Equity Method Investments, Fair Value Disclosure						72.5	0	0	72.5
Goodwill, Fair Value Disclosure										0	0	0	0	0	0	0	0	0
Impairment of goodwill	1,000.0	27.8								997.3				2.7	2.7
Impairment of long-lived assets															49.9
Impairment of equity method investment																			365.4
Total impairment	$ 1,415.3