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Fair Value Measurements (Carrying Amounts And Fair Values Of Financial Instruments) (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Fair Value Measurements [Abstract]    
Available for sale securities, Carrying Amount $ 287,000,000 $ 257,000,000
Available for sale securities, Fair Value 287,000,000 257,000,000
Short-term borrowings, Carrying Amount 98,392,000 40,761,000
Short-term borrowings, Fair Value 98,400,000 40,800,000
Long-term borrowings, Carrying Amount 5,206,800,000 2,783,907,000
Long-term borrowings, Fair Value 5,790,100,000 3,372,600,000
Currency swap agreement $ 53,900,000