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CONDENSED CONSOLIDATED INCOME STATEMENTS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement [Abstract]        
Operating revenues $ 1,672.5 $ 1,631.5 $ 3,959.0 $ 3,936.0
Operating expenses        
Cost of sales 547.7 541.8 1,519.8 1,482.9
Other operation and maintenance 537.7 479.8 1,049.6 984.3
Depreciation and amortization 206.7 197.7 415.3 392.3
Property and revenue taxes 49.6 50.0 98.4 99.6
Total operating expenses 1,341.7 1,269.3 3,083.1 2,959.1
Operating income 330.8 362.2 875.9 976.9
Equity in earnings of transmission affiliates 28.7 41.8 61.5 83.7
Other income, net 31.4 13.1 38.9 31.4
Interest expense 108.5 101.9 215.2 206.6
Other expense (48.4) (47.0) (114.8) (91.5)
Income before income taxes 282.4 315.2 761.1 885.4
Income tax expense 51.1 115.8 139.4 329.1
Net income 231.3 199.4 621.7 556.3
Preferred stock dividends of subsidiary 0.3 0.3 0.6 0.6
Net income attributed to common shareholders $ 231.0 $ 199.1 $ 621.1 $ 555.7
Earnings per share        
Basic (in dollars per share) $ 0.73 $ 0.63 $ 1.97 $ 1.76
Diluted (in dollars per share) $ 0.73 $ 0.63 $ 1.96 $ 1.75
Weighted average common shares outstanding        
Basic (in shares) 315.5 315.6 315.5 315.6
Diluted (in shares) 316.9 317.4 316.9 317.4
Dividends per share of common stock (in dollars per share) $ 0.5525 $ 0.5200 $ 1.1050 $ 1.0400