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CONDENSED CONSOLIDATED INCOME STATEMENTS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income Statement [Abstract]        
Operating revenues $ 2,003.0 $ 1,746.5 $ 7,039.0 $ 6,114.1
Operating expenses        
Cost of sales 805.1 560.7 3,123.5 2,352.2
Other operation and maintenance 454.3 473.7 1,357.7 1,417.4
Depreciation and amortization 280.3 271.6 838.0 799.2
Property and revenue taxes 59.1 50.5 176.0 157.2
Total operating expenses 1,598.8 1,356.5 5,495.2 4,726.0
Operating income 404.2 390.0 1,543.8 1,388.1
Equity in earnings of transmission affiliates 63.7 42.3 148.4 126.2
Other income, net 34.7 25.2 94.1 97.7
Interest expense 127.5 118.0 364.9 357.5
Other expense (29.1) (50.5) (122.4) (133.6)
Income before income taxes 375.1 339.5 1,421.4 1,254.5
Income tax expense 73.4 50.8 263.9 179.8
Net income 301.7 288.7 1,157.5 1,074.7
Preferred stock dividends of subsidiary 0.3 0.3 0.9 0.9
Net (income) loss attributed to noncontrolling interests 0.6 1.6 (1.2) 2.3
Net income attributed to common shareholders $ 302.0 $ 290.0 $ 1,155.4 $ 1,076.1
Earnings per share        
Basic (in dollars per share) $ 0.96 $ 0.92 $ 3.66 $ 3.41
Diluted (in dollars per share) $ 0.96 $ 0.92 $ 3.65 $ 3.40
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