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COMMITTMENTS AND CONTINGENCIES: (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	25 Months Ended
	Mar. 31, 2012 person category	Mar. 31, 2012	Mar. 31, 2011
Environmental costs
Environmental capital expenditure	$ 9.4	$ 9.4	$ 2.9
Peru
Environmental costs
Environmental capital expenditure	1.1	1.1	0.4
Mexican Operations.
Environmental costs
Environmental capital expenditure	8.3	8.3	2.5
Number of categories of collective actions	3
Minimum number of people claiming injury due to collective action initiative in Civil Federal Procedures Code (CFPC)	30
Plant demolition and soil remediation budgeted cost		35.7
Plant demolition and soil cost recognized		$ 25.4

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Amount of environmental remediation costs capitalized during the period. These expenditures may relate to long-lived improvements in operating facilities.

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The total anticipated costs with respect to site restoration or other environmental exit costs that may occur on the sale, disposal, or abandonment of property.

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