Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments And Hedging Activities (Schedule Of Derivatives Not Designated As Hedging Instruments Statements Of Financial Performance Location Table) (Details)

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Derivative Instruments And Hedging Activities (Schedule Of Derivatives Not Designated As Hedging Instruments Statements Of Financial Performance Location Table) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 42.5 $ 100.9
Foreign Exchange Contract [Member] | Product Revenues [Member]
    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net   0.3
Foreign Exchange Contract [Member] | Other Income (Expense) [Member]
    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 0.3 56.0
Customer Supply Agreements [Member] | Product Revenues [Member]
    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 39.2 24.6
Provisional Pricing Arrangements [Member] | Product Revenues [Member]
    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 3.0 $ 20.0