Quarterly report pursuant to Section 13 or 15(d)

Related Parties (Narrative) (Details)

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Related Parties (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Related Parties [Abstract]    
Accounts receivable and derivative assets related parties $ 129.2 $ 180.4
Other current liabilities related parties $ 31.8 $ 43.0