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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING REVENUES      
Total operating revenues $ 2,261.1 $ 2,259.2 $ 2,196.9
COST OF SALES      
Total cost of sales 897.6 880.1 865.0
OPERATING EXPENSES      
Other operation and maintenance 480.3 465.6 451.6
Depreciation and amortization 283.5 322.6 307.9
Taxes other than income 89.4 87.6 91.2
Total operating expenses 853.2 875.8 850.7
Operating income (loss) 510.3 503.3 481.2
OTHER INCOME (EXPENSE)      
Equity in earnings of unconsolidated affiliates 131.2 101.8 15.5
Allowance for equity funds used during construction 39.7 14.2 8.3
Other income 46.4 26.0 27.0
Other expense (14.1) (16.9) (14.3)
Net other income 203.2 125.1 36.5
INTEREST EXPENSE      
Interest on long-term debt 153.6 143.2 147.8
Allowance for borrowed funds used during construction (18.0) (7.5) (4.2)
Interest on short-term debt and other interest charges 8.2 6.4 5.4
Interest expense 143.8 142.1 149.0
INCOME BEFORE TAXES 569.7 486.3 368.7
INCOME TAX (BENEFIT) EXPENSE (49.3) 148.1 97.4
NET INCOME $ 619.0 $ 338.2 $ 271.3
BASIC AVERAGE COMMON SHARES OUTSTANDING 199.7 199.7 199.6
DILUTED AVERAGE COMMON SHARES OUTSTANDING 200.0 199.9 199.6
BASIC EARNINGS PER AVERAGE COMMON SHARE $ 3.10 [1] $ 1.69 [1] $ 1.36
DILUTED EARNINGS PER AVERAGE COMMON SHARE 3.10 [1] 1.69 [1] 1.36
DIVIDENDS DECLARED PER COMMON SHARE $ 1.27000 $ 1.15500 $ 1.05000
[1] Due to the impact of dilution on the earnings per share calculation, quarterly earnings per share amounts may not add to the total.