SEGMENT AND RELATED INFORMATION: (Details 3) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of revenue by geographical location
Net sales outside of segments	$ 1,651,100,000	$ 1,552,400,000	$ 1,659,900,000	$ 1,805,900,000	$ 1,669,300,000	$ 1,745,900,000	$ 1,801,500,000	$ 1,602,000,000	$ 6,669,266,000	$ 6,818,721,000	$ 5,149,500,000
Derivative instruments										13,500,000	(41,900,000)
United States
Schedule of revenue by geographical location
Net sales outside of segments									1,567,400,000	2,103,700,000	1,281,300,000
Europe
Schedule of revenue by geographical location
Net sales outside of segments									1,365,100,000	1,292,100,000	1,066,600,000
Mexican Operations
Schedule of revenue by geographical location
Net sales outside of segments									1,676,400,000	1,269,300,000	872,400,000
Peru
Schedule of revenue by geographical location
Net sales outside of segments									296,200,000	261,700,000	315,800,000
Brazil
Schedule of revenue by geographical location
Net sales outside of segments									449,000,000	598,500,000	446,600,000
Chile
Schedule of revenue by geographical location
Net sales outside of segments									443,500,000	515,800,000	503,000,000
Latin America, other
Schedule of revenue by geographical location
Net sales outside of segments									108,300,000	101,200,000	167,200,000
Asia
Schedule of revenue by geographical location
Net sales outside of segments									$ 763,400,000	$ 662,900,000	$ 538,500,000