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CONDENSED CONSOLIDATED INCOME STATEMENTS - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Statement [Abstract] |  |  |  |
Operating revenues | $ 1,608.0 | $ 1,643.7 | $ 5,575.6 | $ 5,602.7
Operating expenses |  |  |  |
Cost of sales | 484.3 | 524.1 | 1,985.8 | 2,043.9
Other operation and maintenance | 529.2 | 553.1 | 1,583.4 | 1,602.7
Depreciation and amortization | 233.8 | 212.8 | 690.1 | 628.1
Property and revenue taxes | 49.8 | 51.0 | 148.0 | 149.4
Total operating expenses | 1,297.1 | 1,341.0 | 4,407.3 | 4,424.1
Operating income | 310.9 | 302.7 | 1,168.3 | 1,178.6
Equity in earnings of transmission affiliates | 38.7 | 33.7 | 111.7 | 95.2
Other income, net | 21.8 | 26.1 | 76.3 | 65.0
Interest expense | 125.8 | 112.0 | 374.3 | 327.2
Other expense | (65.3) | (52.2) | (186.3) | (167.0)
Income before income taxes | 245.6 | 250.5 | 982.0 | 1,011.6
Income tax expense | 11.3 | 17.0 | 91.5 | 156.4
Net income | 234.3 | 233.5 | 890.5 | 855.2
Preferred stock dividends of subsidiary | 0.3 | 0.3 | 0.9 | 0.9
Net loss attributed to noncontrolling interests | 0.3 | 0.0 | 0.5 | 0.0
Net income attributed to common shareholders | $ 234.3 | $ 233.2 | $ 890.1 | $ 854.3
Earnings per share |  |  |  |
Basic (in dollars per share) | $ 0.74 | $ 0.74 | $ 2.82 | $ 2.71
Diluted (in dollars per share) | $ 0.74 | $ 0.74 | $ 2.81 | $ 2.70
Weighted average common shares outstanding |  |  |  |
Basic (in shares) | 315.4 | 315.5 | 315.4 | 315.5
Diluted (in shares) | 316.8 | 316.9 | 316.7 | 316.9

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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1505-109256 + Details
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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=117326831&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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