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v3.10.0.1

Consolidated Income Statements - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement [Abstract] |  |  |
Operating revenues | $ 7,679.5 | $ 7,648.5 | $ 7,472.3
Cost of sales | 2,897.9 | 2,822.8 | 2,647.4
Other operation and maintenance | 2,270.5 | 2,056.1 | 2,171.3
Depreciation and amortization | 845.8 | 798.6 | 762.6
Property and revenue taxes | 196.9 | 194.9 | 194.7
Total operating expenses | 6,211.1 | 5,872.4 | 5,776.0
Operating income | 1,468.4 | 1,776.1 | 1,696.3
Equity in earnings of transmission affiliates | 136.7 | 154.3 | 146.5
Other income, net | 70.3 | 73.7 | 66.6
Interest expense | 445.1 | 415.7 | 402.7
Other expense | (238.1) | (187.7) | (189.6)
Income before income taxes | 1,230.3 | 1,588.4 | 1,506.7
Income tax expense | 169.8 | 383.5 | 566.5
Net income | 1,060.5 | 1,204.9 | 940.2
Preferred stock dividends of subsidiary | 1.2 | 1.2 | 1.2
Net income attributed to common shareholders | $ 1,059.3 | $ 1,203.7 | $ 939.0
Earnings Per Share (Basic) |  |  |
Basic (in shares) | $ 3.36 | $ 3.81 | $ 2.98
Earnings Per Share (Diluted) |  |  |
Diluted (in shares) | $ 3.34 | $ 3.79 | $ 2.96
Weighted Average Common Shares Outstanding (Basic) |  |  |
Basic (in shares) | 315.5 | 315.6 | 315.6
Weighted Average Common Shares Outstanding (Diluted) |  |  |
Diluted (in shares) | 316.9 | 317.2 | 316.9

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1448-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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