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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue from Contract with Customer, Excluding Assessed Tax $ 477.9 $ 0.0
Revenues from Alternative Revenue Programs 14.8 0.0
Operating revenues 492.7 456.0
COST OF SALES 210.5 208.7
OPERATING EXPENSES    
Other operation and maintenance 118.8 122.1
Depreciation and amortization 78.8 55.6
Taxes other than income 24.1 23.9
Total operating expenses 221.7 201.6
OPERATING INCOME 60.5 45.7
OTHER INCOME (EXPENSE)    
Equity in earnings of unconsolidated affiliates 33.9 35.6
Allowance for equity funds used during construction 7.0 6.9
Pension and Other Postretirement Benefits Cost (Reversal of Cost) 1.3 (1.9)
Other income 5.4 8.8
Other expense (4.4) (4.1)
Net other income 43.2 45.3
INTEREST EXPENSE    
Interest on long-term debt 39.6 35.9
Allowance for borrowed funds used during construction (3.7) (3.3)
Interest on short-term debt and other interest charges 2.7 2.4
Interest expense 38.6 35.0
INCOME BEFORE TAXES 65.1 56.0
INCOME TAX EXPENSE 10.1 20.0
NET INCOME $ 55.0 $ 36.0
BASIC AVERAGE COMMON SHARES OUTSTANDING 199.7 199.7
DILUTED AVERAGE COMMON SHARES OUTSTANDING 200.2 200.0
BASIC EARNINGS PER AVERAGE COMMON SHARE $ 0.28 $ 0.18
DILUTED EARNINGS PER AVERAGE COMMON SHARE 0.27 0.18
DIVIDENDS DECLARED PER COMMON SHARE $ 0.33250 $ 0.30250