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FINANCIAL INSTRUMENTS: (Tables)

3 Months Ended

Mar. 31, 2012

FINANCIAL INSTRUMENTS:

Schedule of carrying amount and estimated fair values of the Company's financial instruments

		As of March 31, 2012						As of December 31, 2011
		Carrying Value			Fair Value			Carrying Value			Fair Value
Liabilities:
Long-term debt		$	2,745.9		$	3,128.2		$	2,745.7		$	2,974.9

Schedule of fair values of assets and liabilities measured at fair value on a recurring basis

		Fair Value at Measurement Date Using:
Description		Fair Value as of March 31, 2012			Quoted prices in active markets for identical assets (Level 1)			Significant other observable inputs (Level 2)			Significant unobservable inputs (Level 3)
Assets:
Short term investment:
- Trading securities		$	220.0		$	220.0
- Available for sale debt securities:
Corporate bonds		0.6						$	0.6
Asset backed obligations		0.1						0.1
Mortgage backed securities		6.6						6.6
Accounts receivable:
- Derivatives - Not classified as hedges:
Provisionally priced sales:
Copper		60.0			60.0
Molybdenum		126.5			126.5			—			—
Total		$	413.8		$	406.5		$	7.3		$	—

		Fair Value at Measurement Date Using:
Description		Fair Value as of December 31, 2011			Quoted prices in active markets for identical assets (Level 1)			Significant other observable inputs (Level 2)			Significant unobservable inputs (Level 3)
Assets:
Short term investment:
- Trading securities		$	514.6		$	514.6
- Available-for-sale debt securities:
Corporate bonds		0.5						$	0.5
Mortgage backed securities		6.8						6.8
Accounts receivable:
- Derivatives – classified as cash flow hedges:
Zero cost collar		8.9						8.9
- Derivatives - Not classified as hedges:
Provisionally priced sales:
Copper		221.5			221.5
Molybdenum		138.1			138.1			—			—
Total		$	890.4		$	874.2		$	16.2		$	—

X

- Definition

Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

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Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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