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CONDENSED CONSOLIDATED INCOME STATEMENTS - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Statement [Abstract]        
Operating revenues $ 2,127.9 $ 1,676.2 $ 5,036.0 $ 4,367.6
Operating expenses        
Cost of sales 935.0 525.9 2,318.4 1,791.5
Other operation and maintenance 449.0 463.8 903.4 943.7
Depreciation and amortization 279.6 266.2 557.7 527.6
Property and revenue taxes 56.1 51.5 116.9 106.7
Total operating expenses 1,719.7 1,307.4 3,896.4 3,369.5
Operating income 408.2 368.8 1,139.6 998.1
Equity in earnings of transmission affiliates 43.0 41.3 84.7 83.9
Other income, net 19.8 39.7 59.4 72.5
Interest expense 119.8 120.0 237.4 239.5
Other expense (57.0) (39.0) (93.3) (83.1)
Income before income taxes 351.2 329.8 1,046.3 915.0
Income tax expense 63.4 54.1 190.5 129.0
Net income 287.8 275.7 855.8 786.0
Preferred stock dividends of subsidiary 0.3 0.3 0.6 0.6
Net (income) loss attributable to noncontrolling interests 0.0 (0.6) 1.8 (0.7)
Net income attributed to common shareholders $ 287.5 $ 276.0 $ 853.4 $ 786.1
Earnings per share        
Basic (in dollars per share) $ 0.91 $ 0.88 $ 2.71 $ 2.49
Diluted (in dollars per share) $ 0.91 $ 0.87 $ 2.70 $ 2.49
Weighted average common shares outstanding        
Basic (in shares) 315.4 315.4 315.4 315.4
Diluted (in shares) 316.2 316.3 316.2 316.3