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Financial Instruments (Schedule of Location and Amounts of Gains and Losses on the Derivative Instrument Designated as a Fair Value Hedge) (Details) (Interest Rate Swap Contract [Member], Interest Expense [Member], USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Interest Rate Swap Contract [Member] | Interest Expense [Member]
   
Gain Recognized on Swap $ 5.7 $ 4.0
(Loss) Recognized on Long-Term Debt $ (5.7) $ (4.0)