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FINANCIAL INSTRUMENTS: (Tables)

9 Months Ended

Sep. 30, 2012

FINANCIAL INSTRUMENTS:

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

		As of September 30, 2012						As of December 31, 2011
		Carrying Value			Fair Value			Carrying Value			Fair Value
Liabilities:
Long-term debt		$	2,741.2		$	3,283.9		$	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 September 30, 2012 Using:												Fair Value at December 31, 2011 Using:
Description		Fair Value as of September 30, 2012			Quoted prices in active markets for identical assets (Level 1)			Significant other observable inputs (Level 2)			Significant unobservable inputs (Level 3)			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		$	373.0		$	373.0								$	514.6		$	514.6
- Available for sale debt securities:
Corporate bonds		0.5						$	0.5					0.5						$	0.5
Asset backed obligations		0.1						0.1						—						—
Mortgage backed securities		6.1						6.1						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		54.3			54.3									221.5			221.5
Molybdenum		101.0			101.0			—						138.1			138.1			—			—
Total		$	535.0		$	528.3		$	6.7		$	—		$	890.4		$	874.2		$	16.2		$	—

Schedule of changes in the fair value of the Company's Level 3 short-term investments

		Nine months ended September 30, 2011
		Available for sale debt securities:
		Corporate bonds			Mortgage backed securities			Total
Balance as of January 1,		$	—		$	1.2		$	1.2
Unrealized gain (loss)								—
Purchases								—
Sales								—
Issuance								—
Settlements								—
Transfers in/out of Level 3		—			(1.2		)	(1.2		)
Balance as of September 30,		$	—		$	—		$	—

X

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

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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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