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Consolidated Income Statements - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Statement [Abstract]      
Operating revenues $ 8,893.0 $ 9,597.4 $ 8,316.0 Close
Operating expenses      
Cost of sales 3,191.2 4,358.9 3,311.0
Other operation and maintenance 2,100.5 1,938.0 2,005.5
Impairment related to ICC disallowances 178.9 0.0 0.0
Depreciation and amortization 1,264.2 1,122.6 1,074.3
Property and revenue taxes 250.2 253.7 210.3
Total operating expenses 6,985.0 7,673.2 6,601.1 Close
Operating income 1,908.0 1,924.2 1,714.9 Close
Equity in earnings of transmission affiliates 177.5 194.7 158.1 Close
Other income, net 177.7 128.8 133.2 CloseClose
Interest expense 726.9 515.1 471.1 Close
Loss on debt extinguishment 0.0 0.0 36.3 Close
Other expense (371.7) (191.6) (216.1) Close
Total Other Income Expenses 710.4 647.0 582.6 0.0 0 Close
Income before income taxes 1,536.3 1,732.6 1,498.8 CloseClose
Income tax expense 204.6 322.9 200.3 Close
Net income 1,331.7 1,409.7 1,298.5 Close
Preferred stock dividends of subsidiary 1.2 1.2 1.2
Net (income) loss attributed to noncontrolling interests 1.2 (0.4) 3.0
Net income attributed to common shareholders $ 1,331.7 $ 1,408.1 $ 1,300.3
Earnings per share      
Basic (in dollars per share) $ 4.22 $ 4.46 $ 4.12
Diluted (in dollars per share) $ 4.22 $ 4.45 $ 4.11
Weighted average common shares outstanding      
Basic (in shares) 315.4 315.4 315.4
Diluted (in shares) 315.9 316.1 316.3