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FINANCIAL INSTRUMENTS: (Tables)

12 Months Ended

Dec. 31, 2011

FINANCIAL INSTRUMENTS:

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

		Balance at December 31, 2011
		Carrying Value			Fair Value
Liabilities:
Long-term debt		$	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 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		$	—

		Fair Value at Measurement Date Using:
Description		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		$	66.9		$	66.9
- Available-for-sale debt securities:
Foreign bonds											—
Corporate bonds		0.4						$	0.4		—
Asset backed obligations		0.3						0.3			—
Mortgage backed securities		8.6						7.4			$	1.2
Accounts receivable:
- Derivatives - Not classified as hedges:
Provisionally priced sales:
Copper		60.7			60.7
Molybdenum		149.7			149.7
Liabilities:
Other current liabilities:
Liability derivatives - Classified as cash flow hedges:
Swap		(124.4		)				(124.4		)
Zero cost collar		(72.6		)	—			(72.6		)
Total		$	89.6		$	277.3		$	(188.9	)	$	1.2

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

		12 months ended December 31, 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 and settlements (net)
Transfers in/out of Level 3		—			(1.2		)	(1.2		)
Balance as of December 31,		$	—		$	—		$	—

		12 months ended December 31, 2010
		Available-for-sale debt securities:
		Corporate bonds			Mortgage backed securities			Total
Balance as of January 1,		$	1.7		$	1.4		$	3.1
Unrealized gain (loss)
Purchases, sales, issuance and settlements (net)		(1.3		)	—			(1.3		)
Transfers in/out of Level 3		(0.4		)	(0.2		)	(0.6		)
Balance as of December 31,		$	—		$	1.2		$	1.2

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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