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CONDENSED CONSOLIDATED INCOME STATEMENTS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]        
Operating revenues $ 1,631.5 $ 1,602.0 $ 3,936.0 $ 3,796.8
Operating expenses        
Cost of sales 541.8 508.3 1,482.9 1,347.2
Other operation and maintenance 479.8 522.0 981.7 1,053.5
Depreciation and amortization 197.7 190.0 392.3 377.9
Property and revenue taxes 50.0 49.6 99.6 96.8
Total operating expenses 1,269.3 1,269.9 2,956.5 2,875.4
Operating income 362.2 332.1 979.5 921.4
Equity in earnings of transmission affiliate 41.8 30.9 83.7 69.4
Other income, net 13.1 32.4 28.8 65.1
Interest expense 101.9 100.1 206.6 201.0
Other expense (47.0) (36.8) (94.1) (66.5)
Income before income taxes 315.2 295.3 885.4 854.9
Income tax expense 115.8 113.6 329.1 326.7
Net income 199.4 181.7 556.3 528.2
Preferred stock dividends of subsidiary 0.3 0.3 0.6 0.6
Net income attributed to common shareholders $ 199.1 $ 181.4 $ 555.7 $ 527.6
Earnings per share        
Basic (in dollars per share) $ 0.63 $ 0.57 $ 1.76 $ 1.67
Diluted (in dollars per share) $ 0.63 $ 0.57 $ 1.75 $ 1.66
Weighted average common shares outstanding        
Basic (in shares) 315.6 315.6 315.6 315.6
Diluted (in shares) 317.4 317.0 317.4 317.0
Dividends per share of common stock (in dollars per share) $ 0.5200 $ 0.4950 $ 1.0400 $ 0.9900