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SEGMENTS AND RELATED INFORMATION: (Details 3) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Schedule of revenue by geographical location |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments | $ 1,669,300,000 | $ 1,745,900,000 | $ 1,801,500,000 | $ 1,602,000,000 | $ 1,499,000,000 | $ 1,257,900,000 | $ 1,173,200,000 | $ 1,219,400,000 | $ 6,818,721,000 | $ 5,149,500,000 | $ 3,734,280,000
Derivative instruments |  |  |  |  |  |  |  |  | 13,500,000 | (41,900,000) |
United States |  |  |  |  |  |  |  |  |  |  |
Schedule of revenue by geographical location |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 2,103,700,000 | 1,281,300,000 | 1,025,400,000
Europe |  |  |  |  |  |  |  |  |  |  |
Schedule of revenue by geographical location |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 1,292,100,000 | 1,066,600,000 | 887,000,000
Mexican Operations. |  |  |  |  |  |  |  |  |  |  |
Schedule of revenue by geographical location |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 1,269,300,000 | 872,400,000 | 858,200,000
Peru |  |  |  |  |  |  |  |  |  |  |
Schedule of revenue by geographical location |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 261,700,000 | 315,800,000 | 112,600,000
Latin America, other |  |  |  |  |  |  |  |  |  |  |
Schedule of revenue by geographical location |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 101,200,000 | 167,200,000 | 95,300,000
Asia |  |  |  |  |  |  |  |  |  |  |
Schedule of revenue by geographical location |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 662,900,000 | 538,500,000 | 314,200,000
Brasil |  |  |  |  |  |  |  |  |  |  |
Schedule of revenue by geographical location |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 598,500,000 | 446,600,000 | 258,400,000
Chile |  |  |  |  |  |  |  |  |  |  |
Schedule of revenue by geographical location |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | $ 515,800,000 | $ 503,000,000 | $ 183,200,000

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