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Fair Value (Carrying Amount And Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Fair Value Disclosures [Abstract]    
Long-term debt (including current portion), Carrying Amount $ 7,155.4 $ 7,796.5
Long-term debt (including current portion), Estimated Fair Value $ 7,228.3 $ 8,603.4