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Represents the entity's weighted average cost of capital (including debt and equity).

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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 Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

Fair value of all liability derivatives designated as cash flow hedging instruments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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The fair value amount of long-term debt 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.

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- Definition

Fair value as of the balance sheet date of all price risk derivative assets designated as cash flow hedging instruments.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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Fair value as of the balance sheet date of all price risk derivative assets not designated as hedging instruments.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

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- Definition

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 Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

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FINANCIAL INSTRUMENTS: (Details) (USD $) In Millions, unless otherwise specified			9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Mitsui loan	Sep. 30, 2011 Copper Fair value measurements recurring Fair value as of the end of the period	Dec. 31, 2010 Copper Fair value measurements recurring Fair value as of the end of the period	Sep. 30, 2011 Copper Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1)	Dec. 31, 2010 Copper Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1)	Sep. 30, 2011 Molybdenum Fair value measurements recurring Fair value as of the end of the period	Dec. 31, 2010 Molybdenum Fair value measurements recurring Fair value as of the end of the period	Sep. 30, 2011 Molybdenum Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1)	Dec. 31, 2010 Molybdenum Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1)	Sep. 30, 2011 Zero cost collar contracts Fair value measurements recurring Fair value as of the end of the period	Dec. 31, 2010 Zero cost collar contracts Fair value measurements recurring Fair value as of the end of the period	Sep. 30, 2011 Zero cost collar contracts Fair value measurements recurring Significant other observable inputs (Level 2)	Dec. 31, 2010 Zero cost collar contracts Fair value measurements recurring Significant other observable inputs (Level 2)	Sep. 30, 2011 Swap contracts Fair value measurements recurring Fair value as of the end of the period	Dec. 31, 2010 Swap contracts Fair value measurements recurring Fair value as of the end of the period	Sep. 30, 2011 Swap contracts Fair value measurements recurring Significant other observable inputs (Level 2)	Dec. 31, 2010 Swap contracts Fair value measurements recurring Significant other observable inputs (Level 2)	Sep. 30, 2011 Fair value measurements recurring Fair value as of the end of the period	Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period	Sep. 30, 2011 Fair value measurements recurring Fair value as of the end of the period Corporate bonds	Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Corporate bonds	Sep. 30, 2011 Fair value measurements recurring Fair value as of the end of the period Asset backed obligations	Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Asset backed obligations	Sep. 30, 2011 Fair value measurements recurring Fair value as of the end of the period Mortgage backed securities	Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Mortgage backed securities	Sep. 30, 2011 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1)	Dec. 31, 2010 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1)	Sep. 30, 2011 Fair value measurements recurring Significant other observable inputs (Level 2)	Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2)	Sep. 30, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) Corporate bonds	Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) Corporate bonds	Sep. 30, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) Asset backed obligations	Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) Asset backed obligations	Sep. 30, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) Mortgage backed securities	Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) Mortgage backed securities	Dec. 31, 2010 Fair value measurements recurring Significant unobservable inputs (Level 3)	Dec. 31, 2010 Fair value measurements recurring Significant unobservable inputs (Level 3) Mortgage backed securities
Liabilities:
Long-term debt, Carrying Value	$ 2,750.6	$ 2,760.4
Long-term debt, Fair Value	2,854.1	2,982.7
Fair values of assets and liabilities measured at fair value on a recurring basis
Fair value calculation, present value based on cash flow discount rate, weighted average cost of capital (as a percent)			11.30%
Short term Investment:
Trading securities investment																				528.3	66.9							528.3	66.9
Available for sale debt securities:
Available for sale debt securities																						0.4	0.4	0.1	0.3	7.0	8.6					0.4	0.4	0.1	0.3	7.0	7.4		1.2
Derivative:
Derivatives classified as cash flow hedges												32.2		32.2		35.3		35.3
Provisionally priced sales				224.2	60.7	224.2	60.7	142.3	149.7	142.3	149.7
Other current liabilities:
Liability derivatives Classified as cash flow hedges:													(72.6)		(72.6)		(124.4)		(124.4)
Total																				$ 969.8	$ 89.6							$ 894.8	$ 277.3	$ 75.0	$ (188.9)							$ 1.2