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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenues from contracts with customers $ 492.0 $ 501.1 $ 912.4 $ 978.5
Other revenues 11.5 12.6 22.4 25.2
Operating revenues 503.5 513.7 934.8 1,003.7
COST OF SALES 137.4 178.7 272.4 391.3
OPERATING EXPENSES        
Other operation and maintenance 117.5 119.8 237.5 238.8
Depreciation and amortization 97.3 84.3 191.7 166.7
Taxes other than income 25.9 20.9 51.5 47.2
Operating expenses 240.7 225.0 480.7 452.7
OPERATING INCOME 125.4 110.0 181.7 159.7
OTHER INCOME (EXPENSE)        
Equity in earnings (losses) of unconsolidated affiliates 26.9 35.8 (719.6) [1] 66.5
Allowance for equity funds used during construction 1.3 1.2 2.6 2.7
Other net periodic benefit expense (1.0) (0.3) (1.5) (7.3)
Other income 14.1 5.0 21.5 11.7
Other expense (12.4) (4.4) (18.5) (10.1)
Net other income (expense) 28.9 37.3 (715.5) 63.5
INTEREST EXPENSE        
Interest on long-term debt 38.8 31.8 75.4 64.4
Allowance for borrowed funds used during construction (0.5) (0.6) (1.0) (1.6)
Interest on short-term debt and other interest charges 2.5 4.7 4.7 7.7
Interest expense 40.8 35.9 79.1 70.5
INCOME (LOSS) BEFORE TAXES 113.5 111.4 (612.9) 152.7
INCOME TAX EXPENSE (BENEFIT) 27.6 11.2 (207.0) 5.4
NET INCOME (LOSS) $ 85.9 $ 100.2 $ (405.9) $ 147.3
BASIC AVERAGE COMMON SHARES OUTSTANDING 200.2 200.2 200.2 200.1
DILUTED AVERAGE COMMON SHARES OUTSTANDING 200.5 200.6 200.2 200.5
BASIC EARNINGS (LOSS) PER AVERAGE COMMON SHARE $ 0.43 $ 0.50 $ (2.03) $ 0.74
DILUTED EARNINGS (LOSS) PER AVERAGE COMMON SHARE $ 0.43 $ 0.50 $ (2.03) $ 0.73
[1] In March 2020, the Company recorded a $780.0 million impairment on its investment in Enable, as further discussed in Notes 4 and 5.