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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

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