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Fair Value (Carrying Amount And Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Fair Value Disclosures [Abstract]    
Long-term Debt (including current portion), Gross $ 6,400.0 $ 6,421.3
Long-term debt (including current portion), Estimated Fair Value $ 7,040.8 $ 7,064.1