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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

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