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CONDENSED CONSOLIDATED INCOME STATEMENTS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Income Statement [Abstract]    
Operating revenues $ 3,149.5 $ 2,680.2
Operating expenses    
Cost of sales 1,165.7 927.1
Other operation and maintenance 608.0 530.8
Depreciation and amortization 359.9 333.4
Property and revenue taxes 78.4 75.5
Total operating expenses 2,212.0 1,866.8
Operating income 937.5 813.4
Equity in earnings of transmission affiliates 53.6 44.8
Other income, net 18.1 44.1
Interest expense 223.0 192.0
Other expense (151.3) (103.1)
Income before income taxes 786.2 710.3
Income tax expense 60.7 87.7
Net income 725.5 622.6
Preferred stock dividends of subsidiary 0.3 0.3
Net income attributed to noncontrolling interests (1.0) 0.0
Net income attributed to common shareholders $ 724.2 $ 622.3
Earnings per share    
Basic (in dollars per share) $ 2.28 $ 1.97
Diluted (in dollars per share) $ 2.27 $ 1.97
Weighted average common shares outstanding    
Basic (in shares) 318.2 315.6
Diluted (in shares) 319.3 315.9