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FINANCIAL INSTRUMENTS: (Tables)

6 Months Ended

Jun. 30, 2011

FINANCIAL INSTRUMENTS:

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

		As of June 30, 2011						As of December 31, 2010
		Carrying Value			Fair Value			Carrying Value			Fair Value
Liabilities:
Long-term debt		$	2,750.4		$	2,854.1		$	2,760.4		$	2,982.7

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

		Fair Value at June 30, 2011 Using:												Fair Value at December 31, 2010 Using:
Description		Fair Value as of June 30, 2011			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, 2010			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		$	216.4		$	216.4								$	66.9		$	66.9
- Available for sale debt securities:
Corporate bonds		0.5						0.5						0.4						$	0.4
Asset backed obligations		0.2						0.2						0.3						0.3
Mortgage backed securities		8.0						8.0						8.6						7.4			$	1.2
Accounts receivable:
- Derivatives — Not classified as hedges:
Provisionally priced sales:
Copper		322.9			322.9									60.7			60.7
Molybdenum		139.4			139.4									149.5			149.5
Liabilities:
Other current liabilities:
Liability derivatives — Classified as cash flow hedges:
Swap		(45.6		)	(45.6		)							(124.4		)	(124.4		)
Zero cost collar		(13.9		)	(13.9		)	—			—			(72.6		)	(72.6		)	—			—
Total		$	627.9		$	619.2		$	8.7		$	—		$	89.4		$	80.1		$	8.1		$	1.2

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

		6 months ended June 30, 2011								6 months ended June 30, 2010
		Available for sale debt securities:								Available for sale debt securities:
		Corporate bonds		Mortgage backed securities			Total			Corporate bonds			Asset backed obligations		Mortgage backed securities			Total
Balance as of January 1,				$	1.2		$	1.2		$	1.7				$	1.4		$	3.1
Unrealized gain (loss)										—					—			—
Purchases										—					—			—
Sales										(1.2		)			—			(1.2		)
Issuance										—					—			—
Settlements										—					—			—
Transfers in/out of Level 3				(1.2		)	(1.2		)	(0.3		)			(1.4		)	(1.7		)
Balance as of June 30,				$	—		$	—		$	0.2				$	—		$	0.2

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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