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v3.8.0.1

Consolidated Income Statements - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |
Operating revenues | $ 7,648.5 | $ 7,472.3 | $ 5,926.1
Cost of sales | 2,822.8 | 2,647.4 | 2,240.1
Other operation and maintenance | 2,047.0 | 2,185.5 | 1,709.3
Depreciation and amortization | 798.6 | 762.6 | 561.8
Property and revenue taxes | 194.9 | 194.7 | 164.4
Total operating expenses | 5,863.3 | 5,790.2 | 4,675.6
Operating Income | 1,785.2 | 1,682.1 | 1,250.5
Equity in earnings of transmission affiliates | 154.3 | 146.5 | 96.1
Other income, net | 64.6 | 80.8 | 58.9
Interest expense | 415.7 | 402.7 | 331.4
Other expense | (196.8) | (175.4) | (176.4)
Income before income taxes | 1,588.4 | 1,506.7 | 1,074.1
Income tax expense | 383.5 | 566.5 | 433.8
Net income | 1,204.9 | 940.2 | 640.3
Preferred stock dividends of subsidiary | 1.2 | 1.2 | 1.8
Net income attributed to common shareholders | $ 1,203.7 | $ 939.0 | $ 638.5
Earnings Per Share (Basic) |  |  |
Earnings per common share (basic) (in dollars per share) | $ 3.81 | $ 2.98 | $ 2.36
Earnings Per Share (Diluted) |  |  |
Earnings per common share (diluted) (in dollars per share) | $ 3.79 | $ 2.96 | $ 2.34
Weighted Average Common Shares Outstanding (Basic) |  |  |
Basic (in shares) | 315.6 | 315.6 | 271.1
Weighted Average Common Shares Outstanding (Diluted) |  |  |
Diluted (in shares) | 317.2 | 316.9 | 272.7

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