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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
OPERATING REVENUES      
Total operating revenues $ 2,259.2 $ 2,196.9 $ 2,453.1
COST OF SALES      
Total cost of sales 880.1 865.0 1,106.6
OPERATING EXPENSES      
Other operation and maintenance 465.6 451.6 439.6
Depreciation and amortization 322.6 307.9 281.4
Taxes other than income 87.6 91.2 88.7
Total operating expenses 875.8 850.7 809.7
Operating income (loss) 503.3 481.2 536.8
OTHER INCOME (EXPENSE)      
Equity in earnings of unconsolidated affiliates 101.8 15.5 [1] 172.6
Allowance for equity funds used during construction 14.2 8.3 4.2
Other income 26.0 27.0 17.8
Other expense (16.9) (14.3) (14.4)
Net other income (expense) 125.1 36.5 180.2
INTEREST EXPENSE      
Interest on long-term debt 143.2 147.8 144.6
Allowance for borrowed funds used during construction (7.5) (4.2) (2.4)
Interest on short-term debt and other interest charges 6.4 5.4 6.2
Interest expense 142.1 149.0 148.4
INCOME BEFORE TAXES 486.3 368.7 568.6
INCOME TAX EXPENSE 148.1 97.4 172.8
NET INCOME $ 338.2 $ 271.3 $ 395.8
BASIC AVERAGE COMMON SHARES OUTSTANDING 199.7 199.6 199.2
DILUTED AVERAGE COMMON SHARES OUTSTANDING 199.9 199.6 199.9
BASIC EARNINGS PER AVERAGE COMMON SHARE $ 1.69 [2] $ 1.36 [2] $ 1.99
DILUTED EARNINGS PER AVERAGE COMMON SHARE 1.69 [2] 1.36 [2] 1.98
DIVIDENDS DECLARED PER COMMON SHARE $ 1.15500 $ 1.05000 $ 0.95000
[1] In 2015, The Company recorded a $108.4 million pre-tax charge during the third quarter of 2015 for its share of the goodwill impairment, as adjusted for the basis difference. See Note 3 for further discussion of Enable's goodwill impairment.
[2] Due to the impact of dilution on the earnings per share calculation, quarterly earnings per share amounts may not add to the total.