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CONDENSED CONSOLIDATED INCOME STATEMENTS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Statement [Abstract]        
Operating revenues $ 1,651.0 $ 1,608.0 $ 5,308.3 $ 5,575.6
Operating expenses        
Cost of sales 482.8 484.3 1,662.0 1,985.8
Other operation and maintenance 498.7 529.2 1,427.5 1,583.4
Depreciation and amortization 245.0 233.8 726.6 690.1
Property and revenue taxes 54.3 49.8 156.6 148.0
Total operating expenses 1,280.8 1,297.1 3,972.7 4,407.3
Operating income 370.2 310.9 1,335.6 1,168.3
Equity in earnings of transmission affiliates 40.1 38.7 132.8 111.7
Other income, net 25.7 21.8 59.9 76.3
Interest expense 122.0 125.8 375.8 374.3
Other expense (56.2) (65.3) (183.1) (186.3)
Income before income taxes 314.0 245.6 1,152.5 982.0
Income tax expense 46.9 11.3 190.7 91.5
Net income 267.1 234.3 961.8 890.5
Preferred stock dividends of subsidiary 0.3 0.3 0.9 0.9
Net loss attributed to noncontrolling interests 0.0 0.3 0.0 0.5
Net income attributed to common shareholders $ 266.8 $ 234.3 $ 960.9 $ 890.1
Earnings per share        
Basic (in dollars per share) $ 0.85 $ 0.74 $ 3.05 $ 2.82
Diluted (in dollars per share) $ 0.84 $ 0.74 $ 3.04 $ 2.81
Weighted average common shares outstanding        
Basic (in shares) 315.4 315.4 315.4 315.4
Diluted (in shares) 316.5 316.8 316.6 316.7