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Contractual Obligations, Commercial Commitments And Contingencies (Schedule Of Contractual Obligations And Commercial Commitments) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Contractual Obligations, Commercial Commitments And Contingencies [Abstract]    
Total long-term debt $ 924.3 $ 934.0
Long-term debt, Payment Year 2011 0.4  
Long-term debt, Payment Year Thereafter $ 1,252.8