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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenues from contracts with customers | $ 739.2 | $ 684.5 | $ 1,717.7 | $ 1,710.1
Other revenues | 16.2 | 14.3 | 41.4 | 48.4
Operating revenues | 755.4 | 698.8 | 1,759.1 | 1,758.5
COST OF SALES | 234.0 | 244.4 | 625.3 | 663.6
OPERATING EXPENSES |  |  |  |
Other operation and maintenance | 129.8 | 123.3 | 368.6 | 353.2
Depreciation and amortization | 94.1 | 81.1 | 260.8 | 240.8
Taxes other than income | 23.2 | 22.7 | 70.4 | 69.3
Operating expenses | 247.1 | 227.1 | 699.8 | 663.3
OPERATING INCOME | 274.3 | 227.3 | 434.0 | 431.6
OTHER INCOME (EXPENSE) |  |  |  |
Equity in earnings of unconsolidated affiliates | 38.3 | 40.1 | 104.8 | 103.3
Allowance for equity funds used during construction | 1.0 | 6.7 | 3.7 | 20.0
Other net periodic benefit expense | (1.4) | (0.7) | (8.7) | (10.7)
Other income | 4.6 | 4.1 | 16.3 | 14.2
Other expense | (5.5) | (3.4) | (15.6) | (11.1)
Net other income | 37.0 | 46.8 | 100.5 | 115.7
INTEREST EXPENSE |  |  |  |
Interest on long-term debt | 37.5 | 40.2 | 101.9 | 119.5
Allowance for borrowed funds used during construction | (0.6) | (3.3) | (2.2) | (9.8)
Interest on short-term debt and other interest charges | 2.7 | 1.8 | 10.4 | 8.5
Interest expense | 39.6 | 38.7 | 110.1 | 118.2
INCOME BEFORE TAXES | 271.7 | 235.4 | 424.4 | 429.1
INCOME TAX EXPENSE | 20.8 | 30.3 | 26.2 | 58.3
NET INCOME | $ 250.9 | $ 205.1 | $ 398.2 | $ 370.8
BASIC AVERAGE COMMON SHARES OUTSTANDING | 200.2 | 199.7 | 200.1 | 199.7
DILUTED AVERAGE COMMON SHARES OUTSTANDING | 200.8 | 200.6 | 200.6 | 200.4
BASIC EARNINGS PER AVERAGE COMMON SHARE | $ 1.25 | $ 1.03 | $ 1.99 | $ 1.86
DILUTED EARNINGS PER AVERAGE COMMON SHARE | $ 1.25 | $ 1.02 | $ 1.98 | $ 1.85

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