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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenues from contracts with customers | $ 684.5 | $ 0.0 | $ 1,710.1 | $ 0.0
Other revenues | 14.3 | 0.0 | 48.4 | 0.0
Operating revenues | 698.8 | 716.8 | 1,758.5 | 1,759.2
COST OF SALES | 244.4 | 255.7 | 663.6 | 696.5
OPERATING EXPENSES |  |  |  |
Other operation and maintenance | 123.3 | 111.9 | 353.2 | 340.9
Depreciation and amortization | 81.1 | 76.9 | 240.8 | 207.2
Taxes other than income | 22.7 | 23.2 | 69.3 | 68.4
Operating expenses | 227.1 | 212.0 | 663.3 | 616.5
OPERATING INCOME | 227.3 | 249.1 | 431.6 | 446.2
OTHER INCOME (EXPENSE) |  |  |  |
Equity in earnings of unconsolidated affiliates | 40.1 | 33.6 | 103.3 | 98.6
Allowance for equity funds used during construction | 6.7 | 11.8 | 20.0 | 27.2
Other net periodic benefit income (expense) | (0.7) | (5.8) | (10.7) | (15.6)
Other income | 4.1 | 15.0 | 14.2 | 34.1
Other expense | (3.4) | (2.0) | (11.1) | (9.3)
Net other income | 46.8 | 52.6 | 115.7 | 135.0
INTEREST EXPENSE |  |  |  |
Interest on long-term debt | 40.2 | 38.7 | 119.5 | 113.8
Allowance for borrowed funds used during construction | (3.3) | (5.2) | (9.8) | (12.6)
Interest on short-term debt and other interest charges | 1.8 | 2.4 | 8.5 | 6.8
Interest expense | 38.7 | 35.9 | 118.2 | 108.0
INCOME BEFORE TAXES | 235.4 | 265.8 | 429.1 | 473.2
INCOME TAX EXPENSE | 30.3 | 82.4 | 58.3 | 149.0
NET INCOME | $ 205.1 | $ 183.4 | $ 370.8 | $ 324.2
BASIC AVERAGE COMMON SHARES OUTSTANDING | 199.7 | 199.7 | 199.7 | 199.7
DILUTED AVERAGE COMMON SHARES OUTSTANDING | 200.6 | 200.1 | 200.4 | 200.0
BASIC EARNINGS PER AVERAGE COMMON SHARE | $ 1.03 | $ 0.92 | $ 1.86 | $ 1.62
DILUTED EARNINGS PER AVERAGE COMMON SHARE | 1.02 | 0.92 | 1.85 | 1.62
DIVIDENDS DECLARED PER COMMON SHARE | $ 0.36500 | $ 0.33250 | $ 1.03000 | $ 0.93750

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