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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue from Contract with Customer, Excluding Assessed Tax | $ 2,211.7 |  | $ 0.0 |  | $ 0.0
Revenues from Alternative Revenue Programs | 58.6 |  | 0.0 |  | 0.0
OPERATING REVENUES |  |  |  |  |
Total operating revenues | 2,270.3 |  | 2,261.1 |  | 2,259.2
Total cost of sales | 892.5 |  | 897.6 |  | 880.1
OPERATING EXPENSES |  |  |  |  |
Other operation and maintenance | 474.6 |  | 458.7 |  | 438.1
Depreciation and amortization | 321.6 |  | 283.5 |  | 322.6
Taxes other than income | 92.0 |  | 89.4 |  | 87.6
Operating expenses | 888.2 |  | 831.6 |  | 848.3
Operating income (loss) | 489.6 |  | 531.9 |  | 530.8
OTHER INCOME (EXPENSE) |  |  |  |  |
Equity in earnings of unconsolidated affiliates | 152.8 |  | 131.2 |  | 101.8
Allowance for equity funds used during construction | 23.8 |  | 39.7 |  | 14.2
Pension and Other Postretirement Benefits Cost (Reversal of Cost) | (10.8) |  | (21.6) |  | (27.5)
Other income | 21.7 |  | 46.4 |  | 26.0
Other expense | (23.4) |  | (14.1) |  | (16.9)
Net other income | 164.1 |  | 181.6 |  | 97.6
INTEREST EXPENSE |  |  |  |  |
Interest on long-term debt | 157.4 |  | 153.6 |  | 143.2
Allowance for borrowed funds used during construction | (11.7) |  | (18.0) |  | (7.5)
Interest on short-term debt and other interest charges | 10.3 |  | 8.2 |  | 6.4
Interest expense | 156.0 |  | 143.8 |  | 142.1
INCOME BEFORE TAXES | 497.7 |  | 569.7 |  | 486.3
INCOME TAX EXPENSE (BENEFIT) | 72.2 |  | (49.3) | [1] | 148.1
NET INCOME | $ 425.5 |  | $ 619.0 |  | $ 338.2
BASIC AVERAGE COMMON SHARES OUTSTANDING | 199.7 |  | 199.7 |  | 199.7
DILUTED AVERAGE COMMON SHARES OUTSTANDING | 200.5 |  | 200.0 |  | 199.9
BASIC EARNINGS PER AVERAGE COMMON SHARE | $ 2.13 | [2] | $ 3.10 | [2] | $ 1.69
DILUTED EARNINGS PER AVERAGE COMMON SHARE | 2.12 | [2] | 3.10 | [2] | 1.69
DIVIDENDS DECLARED PER COMMON SHARE | $ 1.39500 |  | $ 1.27000 |  | $ 1.15500
[1] | The Company recorded an income tax benefit of $245.2 million and income tax expense of $10.5 million during the fourth quarter of 2017 due to the Company remeasuring deferred taxes related to the natural gas midstream operations and other operations segments, respectively, as a result of the 2017 Tax Act. See Note 8 for further discussion of the effects of the 2017 Tax Act.
[2] | Due to the impact of dilution on the earnings per share calculation, quarterly earnings per share amounts may not add to the total.

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