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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

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