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Derivative Financial Instruments (Details)
6 Months Ended
Jun. 30, 2011
USD ($)
Dec. 31, 2010
USD ($)
Jun. 30, 2011
Aluminum
MT
Dec. 31, 2010
Aluminum
MT
Jun. 30, 2011
Copper
MT
Dec. 31, 2010
Copper
MT
Jun. 30, 2011
Natural Gas
MMBtu
Dec. 31, 2010
Natural Gas
MMBtu
Jun. 30, 2011
Steel
T
Jun. 30, 2011
Canadian Dollar
CAD
Dec. 31, 2010
Canadian Dollar
CAD
Jun. 30, 2011
Chinese Renminbi
CNY
Jun. 30, 2011
European Euro
EUR (€)
Dec. 31, 2010
European Euro
EUR (€)
Jun. 30, 2011
South Korean Won
KRW
Dec. 31, 2010
South Korean Won
KRW
Jun. 30, 2011
Singapore Dollar
SGD
Dec. 31, 2010
Singapore Dollar
SGD
Jun. 30, 2011
United States Dollar
USD ($)
Dec. 31, 2010
United States Dollar
USD ($)
Dec. 31, 2010
Great British Pound
GBP (£)
Jun. 30, 2011
Japanese Yen
USD ($)
Jun. 30, 2011
2018 Notes
USD ($)
Dec. 31, 2010
2018 Notes
USD ($)
Jun. 30, 2011
2020 Notes
USD ($)
Dec. 31, 2010
2020 Notes
USD ($)
Derivative Financial Instruments                                                    
Estimated amount of unrealized and realized gains, net of tax, related to commodity price and currency rate hedging that will be reclassified from other comprehensive income into earnings $ 2,900,000                                                  
Hedge period, low end of the range (in months) 12                                                  
Hedge period, high end of the range (in months) 24                                                  
Derivative financial instruments                                                    
Commodity units hedged     853 688 572 312 211,487 304,177 7,019                                  
Short currency units hedged                   23,561,557 21,186,951 17,631,000 68,389,382 43,440,929 2,199,820,637 2,245,331,882 4,800,000 4,140,000 9,907,323 8,828,840 399,999          
Notional amount of the company's receive-floating/pay-fixed interest rate swaps of the company's term loans   650,800,000                                                
Designated fair market value hedges of receive-fixed/pay-float swaps of the company's senior notes                                             200,000,000 200,000,000 300,000,000 300,000,000
Notional Amount of foreign currency derivatives not designated as Hedging Instruments                         € 22,842,432 € 7,732,026         $ 39,302,482 $ 33,158,979 £ 8,172,569 $ 200,000,000