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CONDENSED CONSOLIDATED INCOME STATEMENTS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Operating revenues $ 2,104.0 $ 1,863.5 $ 7,263.0 $ 6,315.7
Operating expenses        
Cost of sales 608.1 520.8 2,344.3 1,917.6
Other operation and maintenance 605.1 566.8 1,809.3 1,631.0
Depreciation and amortization 373.4 340.5 1,102.2 1,010.5
Property and revenue taxes 67.8 51.7 215.2 194.7
Total operating expenses 1,654.4 1,479.8 5,471.0 4,753.8
Operating income 449.6 383.7 1,792.0 1,561.9
Equity in earnings of transmission affiliates 54.8 46.7 160.3 138.3
Other income, net 23.8 44.0 68.4 128.7
Interest expense 223.6 204.2 667.4 596.8
Other expense (145.0) (113.5) (438.7) (329.8)
Income before income taxes 304.6 270.2 1,353.3 1,232.1
Income tax expense 34.4 31.6 114.6 160.9
Net income 270.2 238.6 1,238.7 1,071.2
Preferred stock dividends of subsidiary 0.3 0.3 0.9 0.9
Net loss attributed to noncontrolling interests 1.4 1.8 3.1 3.4
Net income attributed to common shareholders $ 271.3 $ 240.1 $ 1,240.9 $ 1,073.7
EPS        
Basic (in dollars per share) $ 0.84 $ 0.76 $ 3.87 $ 3.40
Diluted (in dollars per share) $ 0.83 $ 0.76 $ 3.85 $ 3.40
Weighted average common shares outstanding        
Basic (in shares) 323.5 316.2 320.7 315.9
Diluted (in shares) 325.6 316.5 322.4 316.2