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CONDENSED CONSOLIDATED INCOME STATEMENTS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Operating revenues $ 1,657.5 $ 1,712.5 $ 5,593.5 $ 5,509.3
Operating expenses        
Cost of sales 542.7 554.7 2,025.6 1,901.9
Other operation and maintenance 471.7 517.5 1,453.4 1,571.0
Depreciation and amortization 201.2 191.6 593.5 569.5
Property and revenue taxes 48.3 49.7 147.9 146.5
Total operating expenses 1,263.9 1,313.5 4,220.4 4,188.9
Operating income 393.6 399.0 1,373.1 1,320.4
Equity in earnings of transmission affiliate 39.2 38.3 122.9 107.7
Other income, net 16.4 7.5 45.2 72.6
Interest expense 103.8 99.1 310.4 300.1
Other expense (48.2) (53.3) (142.3) (119.8)
Income before income taxes 345.4 345.7 1,230.8 1,200.6
Income tax expense 129.7 128.4 458.8 455.1
Net income 215.7 217.3 772.0 745.5
Preferred stock dividends of subsidiary 0.3 0.3 0.9 0.9
Net income attributed to common shareholders $ 215.4 $ 217.0 $ 771.1 $ 744.6
Earnings per share        
Basic (in dollars per share) $ 0.68 $ 0.69 $ 2.44 $ 2.36
Diluted (in dollars per share) $ 0.68 $ 0.68 $ 2.43 $ 2.35
Weighted average common shares outstanding        
Basic (in shares) 315.6 315.6 315.6 315.6
Diluted (in shares) 317.5 316.9 317.5 317.0
Dividends per share of common stock (in dollars per share) $ 0.520 $ 0.495 $ 1.560 $ 1.485