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DERIVATIVE INSTRUMENTS: (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012
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
Realized gain (loss) on copper derivatives	$ 13.5	$ (41.9)
Zero cost collar contracts | 2011
Copper derivative activity related to copper sales transactions
Pounds	423,300,000		46,300,000
Average LME cap price	3.63		5.18
Average LME floor price	2.27		3.50
Swap contracts | 2011
Copper derivative activity related to copper sales transactions
Pounds	390,800,000
Weighted average COMEX price	3.46
Realized gain (loss) on copper derivatives	$ 13.5

X

- 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

No definition available.

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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

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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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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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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No definition available.

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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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