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Fair Value (Carrying Amount And Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Fair Value Disclosures [Abstract]      
Gain (Loss) on Sale of Assets and Asset Impairment Charges $ (280.2) $ 0.0  
Allowance for Credit Loss (1.2)   $ 0.0
Long-term Debt (including current portion), Carrying Amount 7,825.8   7,869.6
Long-term debt (including current portion), Estimated Fair Value $ 8,381.1   $ 8,764.4