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Derivative Instruments and Hedging Activities Fair Value Balance Sheet (Details)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Cross currency swaps
CAD
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Cross currency swaps
CAD
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Cross currency swaps
Other current assets
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Cross currency swaps
Other current assets
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Cross currency swaps
Other assets
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Cross currency swaps
Other assets
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Cross currency swaps
Current derivative liability
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Cross currency swaps
Current derivative liability
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Cross currency swaps
Long term derivative liability
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Cross currency swaps
Long term derivative liability
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Foreign currency forwards
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Foreign currency forwards
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Foreign currency forwards
Other current assets
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Foreign currency forwards
Other current assets
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Foreign currency forwards
Other assets
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Foreign currency forwards
Other assets
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Foreign currency forwards
Current derivative liability
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Foreign currency forwards
Current derivative liability
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Foreign currency forwards
Long term derivative liability
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Foreign currency forwards
Long term derivative liability
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Commodity swaps
gigajoules
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Commodity swaps
gigajoules
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Commodity swaps
Other current assets
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Commodity swaps
Other current assets
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Commodity swaps
Other assets
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Commodity swaps
Other assets
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Commodity swaps
Current derivative liability
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Commodity swaps
Current derivative liability
USD ($)
Jun. 30, 2012
Designated as Hedging Instrument [Member]
Commodity swaps
Long term derivative liability
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Commodity swaps
Long term derivative liability
USD ($)
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
USD ($)
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Equity conversion feature of debt
EUR (€)
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Equity conversion feature of debt
Current derivative liability
USD ($)
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
t
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
t
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Other current assets
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Other current assets
USD ($)
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Other assets
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Other assets
USD ($)
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Current derivative liability
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Current derivative liability
USD ($)
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Long term derivative liability
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Long term derivative liability
USD ($)
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Deisel [Member]
t
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Deisel [Member]
t
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Deisel [Member]
Other current assets
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Deisel [Member]
Other current assets
USD ($)
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Deisel [Member]
Other assets
USD ($)
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Deisel [Member]
Current derivative liability
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Deisel [Member]
Current derivative liability
USD ($)
Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Deisel [Member]
Long term derivative liability
USD ($)
Derivatives designated as hedging instruments:                                                                                                            
Notional Amounts     601,300,000 901,300,000                 $ 437,300,000 $ 464,600,000                                                                                
Notional Amount of Derivatives Nonmonetary Designated as Hedging Instrument, Energy                                             1,300,000 2,200,000                                                            
Derivative asset, fair value, designated as hedging instrument 6,500,000 3,400,000     0 0 0 0             2,600,000 0 3,800,000 3,400,000             100,000 0 0 0                                                    
Derivative fair value, liability (212,900,000) (315,500,000)             0 (103,200,000) (208,600,000) (208,700,000)             (2,600,000) (1,300,000) (300,000) 0             (1,200,000) (1,800,000) (200,000) (500,000)                                            
Derivatives not designated as hedging instruments:                                                                                                            
Notional Amount of Other Derivatives Not Designated as Hedging Instruments                                                                     500.0                                      
Notional amount of derivatives not designated as hedging instrument In Metric Tonnes                                                                         5,150.0 8,825.0                 7,518.0 9,668.0            
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value                                                                 700,000 100,000         0 0 0 0             400,000 100,000 300,000      
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value                                                                 $ (24,100,000) $ (4,600,000)   $ (20,800,000)             $ (2,600,000) $ (1,300,000) $ (700,000) $ (3,300,000)           $ 0 $ 0 $ 0