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Fair Value (Carrying Amount And Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Fair Value Disclosures [Abstract]    
Long-term Debt (including current portion), Gross $ 6,678.8 $ 6,382.2
Long-term debt (including current portion), Estimated Fair Value $ 7,639.9 $ 6,975.7