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Statements Of Consolidated Income (Loss) - USD ($)
shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating Revenues    
Customer revenues [1] $ 1,525.9 $ 1,834.5
Other revenues 79.6 35.3
Total Operating Revenues 1,605.5 1,869.8
Operating Expenses    
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization 462.4 680.3
Operation and maintenance 444.6 552.4
Depreciation and amortization 184.3 175.1
Gain (Loss) on Sale of Assets and Asset Impairment Charges 280.2 0.0
Loss (gain) on sale of fixed assets and impairments, net (0.1) 0.2
Other taxes 85.9 87.6
Operating Costs and Expenses 1,457.3 1,495.6
Operating Income 148.2 374.2
Other Income (Deductions)    
Interest expense, net (92.9) (95.6)
Other, net 5.4 (0.7)
Total Other Deductions, Net (87.5) (96.3)
Income before Income Taxes 60.7 277.9
Income Taxes (14.9) 59.0
Net Income 75.6 218.9
Preferred dividends (13.8) (13.8)
Net Income Available to Common Shareholders $ 61.8 $ 205.1
Earnings Per Share    
Basic Earnings Per Share $ 0.16 $ 0.55
Diluted Earnings Per Share $ 0.16 $ 0.55
Basic Average Common Shares Outstanding 383,062 373,356
Diluted Average Common Shares 384,114 374,656
[1] Customer revenue amounts exclude intersegment revenues. See Note 21, "Business Segment Information," for discussion of intersegment revenues.