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CONDENSED CONSOLIDATED INCOME STATEMENTS (Unaudited) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Income Statement [Abstract] |  |
Operating revenues | $ 2,304.5 | $ 2,194.8
Operating expenses |  |
Cost of sales | 941.1 | 838.9
Other operation and maintenance | 501.9 | 531.5
Depreciation and amortization | 194.6 | 187.9
Property and revenue taxes | 49.6 | 47.2
Total operating expenses | 1,687.2 | 1,605.5
Operating income | 617.3 | 589.3
Equity in earnings of transmission affiliate | 41.9 | 38.5
Other income, net | 15.7 | 32.7
Interest expense | 104.7 | 100.9
Other expense | (47.1) | (29.7)
Income before income taxes | 570.2 | 559.6
Income tax expense | 213.3 | 213.1
Net income | 356.9 | 346.5
Preferred stock dividends of subsidiary | 0.3 | 0.3
Net income attributed to common shareholders | $ 356.6 | $ 346.2
Earnings per share |  |
Basic (in dollars per share) | $ 1.13 | $ 1.10
Diluted (in dollars per share) | $ 1.12 | $ 1.09
Weighted average common shares outstanding |  |
Basic (in shares) | 315.6 | 315.7
Diluted (in shares) | 317.2 | 317.1
Dividends per share of common stock (in dollars per share) | $ 0.5200 | $ 0.4950

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