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Fair Value (Carrying Amount And Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Fair Value Disclosures [Abstract]    
Long-term Debt (including current portion), Carrying Amount $ 9,246.7 $ 9,243.1
Long-term debt (including current portion), Estimated Fair Value $ 10,178.0 $ 11,034.2