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Derivative Instruments and Hedging Activities Fair Value Balance Sheet (Details)
In Millions, unless otherwise specified
Mar. 31, 2012
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
USD ($)
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Cross currency swaps
CAD
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Cross currency swaps
CAD
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Cross currency swaps
Other current assets
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Cross currency swaps
Other current assets
USD ($)
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Cross currency swaps
Other assets
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Cross currency swaps
Other assets
USD ($)
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Cross currency swaps
Current derivative liability
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Cross currency swaps
Current derivative liability
USD ($)
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Cross currency swaps
Long term derivative liability
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Cross currency swaps
Long term derivative liability
USD ($)
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Foreign currency forwards
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Foreign currency forwards
USD ($)
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Foreign currency forwards
Other current assets
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Foreign currency forwards
Other current assets
USD ($)
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Foreign currency forwards
Other assets
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Foreign currency forwards
Other assets
USD ($)
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Foreign currency forwards
Current derivative liability
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Foreign currency forwards
Current derivative liability
USD ($)
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Foreign currency forwards
Long term derivative liability
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Foreign currency forwards
Long term derivative liability
USD ($)
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Commodity Contract [Member]
gigajoules
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Commodity Contract [Member]
gigajoules
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Commodity Contract [Member]
Other current assets
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Commodity Contract [Member]
Other current assets
USD ($)
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Commodity Contract [Member]
Other assets
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Commodity Contract [Member]
Other assets
USD ($)
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Commodity Contract [Member]
Current derivative liability
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Commodity Contract [Member]
Current derivative liability
USD ($)
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Commodity Contract [Member]
Long term derivative liability
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Commodity Contract [Member]
Long term derivative liability
USD ($)
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
USD ($)
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
t
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
t
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Other current assets
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Other current assets
USD ($)
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Other assets
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Other assets
USD ($)
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Current derivative liability
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Current derivative liability
USD ($)
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Long term derivative liability
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Aluminum [Member]
Long term derivative liability
USD ($)
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Deisel [Member]
t
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Deisel [Member]
t
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Deisel [Member]
Other current assets
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Deisel [Member]
Other current assets
USD ($)
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Deisel [Member]
Other assets
USD ($)
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Deisel [Member]
Current derivative liability
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Deisel [Member]
Current derivative liability
USD ($)
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Deisel [Member]
Long term derivative liability
USD ($)
Derivatives designated as hedging instruments:                                                                                                        
Notional Amounts     601.3 901.3                 $ 440.2 $ 464.6                                                                            
Notional Amount of Derivatives Nonmonetary Designated as Hedging Instrument, Energy                                             1,300,000 2,200,000                                                        
Derivative asset, fair value, designated as hedging instrument 4.2 3.4     0 0 0 0             1.5 0 2.1 3.4             0.5 0 0.1 0                                                
Derivative fair value, liability (229.8) (315.5)             0 (103.2) (220.1) (208.7)             (6.0) (1.3) (2.0) 0             (1.4) (1.8) (0.3) (0.5)                                        
Derivatives not designated as hedging instruments:                                                                                                        
Notional amount of derivatives not designated as hedging instrument In Metric Tonnes                                                                     7,750.0 8,825.0                 8,050.0 9,668.0            
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value                                                                 0 0.1     0 0 0 0             0 0.1 0      
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value                                                                 $ (4.2) $ (4.6)             $ (3.4) $ (1.3) $ 0 $ (3.3)           $ (0.6) $ 0 $ (0.2)