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SEGMENTS AND RELATED INFORMATION: (Details 3) (USD $)
 3 Months Ended 12 Months Ended
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