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Fair Value (Carrying Amount And Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Fair Value Disclosures [Abstract]    
Long-term Debt (including current portion), Carrying Amount $ 12,833.0 $ 11,079.3
Long-term debt (including current portion), Estimated Fair Value $ 11,762.2 $ 10,370.9