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DERIVATIVE INSTRUMENTS: (Details) (USD $) In Millions, unless otherwise specified		3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011 Zero cost collar and swap contracts	Mar. 31, 2012 Zero cost collar contracts 1st Quarter 2012 priceperunit lbs	Mar. 31, 2011 Zero cost collar contracts 1st Quarter 2011 priceperunit lbs	Mar. 31, 2011 Swap contracts 1st Quarter 2011 lbs priceperunit
DERIVATIVE INSTRUMENTS:
Minimum correlation coefficient between average monthly copper prices on LME and COMEX exchanges (as a percent)	99.90%
Copper derivative activity related to copper sales transactions
Pound			46,300,000	105,800,000	119,600,000
Average LME cap price			5.18	4.84
Average LME floor price			3.50	3.02
Weighted average COMEX price					4.08
Realized loss on copper derivatives		$ (35.8)

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- Definition

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

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- Definition

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

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- Definition

Average fixed price related to the group of price risk swap derivatives.

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- Definition

The aggregate net gain (loss) on price risk derivatives included in earnings in the period.

+ References

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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- Definition

The correlation coefficient between the hypothetical instrument and the hedged item used in determination of the effectiveness of a hedging relationship.

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- Definition

Aggregate notional amount of price risk derivatives for instruments with notional amounts expressed in nonmonetary units.

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