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Statements Of Consolidated Income (Loss) - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Revenues      
Customer revenues $ 4,991.1 [1] $ 4,730.2 $ 4,392.5
Other revenues 123.4 144.4 100.0
Total Operating Revenues 5,114.5 4,874.6 4,492.5
Operating Expenses      
Cost of Sales (excluding depreciation and amortization) 1,761.3 1,518.7 1,390.2
Operation and maintenance 2,352.9 1,601.7 1,445.8
Depreciation and amortization 599.6 570.3 547.1
Loss (Gain) on sale of assets and impairments, net 1.2 5.5 (1.0)
Other taxes 274.8 257.2 244.3
Total Operating Expenses 4,989.8 3,953.4 3,626.4
Operating Income (Loss) 124.7 921.2 866.1
Other Income (Deductions)      
Interest expense, net (353.3) (353.2) (349.5)
Other, net 43.5 (13.5) (3.0)
Loss on early extinguishment of long-term debt (45.5) (111.5) 0.0
Total Other Deductions, Net (355.3) (478.2) (352.5)
Income (Loss) before Income Taxes (230.6) 443.0 513.6
Income Taxes (180.0) 314.5 182.1
Net Income (Loss) (50.6) 128.5 331.5
Preferred dividends (15.0) 0.0 0.0
Net Income (Loss) Available to Common Shareholders $ (65.6) $ 128.5 $ 331.5
Earnings Per Share      
Basic Earnings (Loss) Per Share $ (0.18) $ 0.39 $ 1.03
Diluted Earnings (Loss) Per Share $ (0.18) $ 0.39 $ 1.02
Basic Average Common Shares Outstanding 356,491 329,388 321,805
Diluted Average Common Shares 356,491 330,756 323,524
[1] Customer revenue amounts exclude intersegment revenues. See Note 22, "Segments of Business," for discussion of intersegment revenues.