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CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenues from contracts with customers $ 923.0 $ 1,250.6 $ 2,056.8 $ 2,619.7
Other revenues 22.4 20.2 50.8 44.1
Revenues, Total 945.4 1,270.8 2,107.6 2,663.8
FUEL, PURCHASED POWER AND DIRECT TRANSMISSION EXPENSE 333.8 673.8 716.2 1,322.8
OPERATING EXPENSES        
Other operation and maintenance 122.7 131.4 381.4 364.5
Depreciation and amortization 132.5 122.4 377.8 341.4
Taxes other than income 25.3 25.3 78.2 77.5
Operating expenses 280.5 279.1 837.4 783.4
OPERATING INCOME 331.1 317.9 554.0 557.6
OTHER INCOME (EXPENSE)        
Allowance for equity funds used during construction 4.5 2.4 14.1 4.6
Other net periodic benefit income (expense) 1.5 0.3 4.1 (11.8)
Gain on equity securities (Note 1) 0.0 39.4 0.0 282.1
Other income 8.5 16.1 38.1 60.6
Other expense (7.9) (19.5) (18.8) (33.1)
Net other income 6.6 38.7 37.5 302.4
INTEREST EXPENSE        
Interest on long-term debt 52.0 40.8 153.0 119.7
Allowance for borrowed funds used during construction (1.9) (0.6) (5.3) (2.7)
Interest on short-term debt and other interest charges 7.3 2.0 15.2 7.7
Interest expense 57.4 42.2 162.9 124.7
INCOME BEFORE TAXES 280.3 314.4 428.6 735.3
INCOME TAX EXPENSE 38.4 51.6 60.0 119.9
NET INCOME $ 241.9 $ 262.8 $ 368.6 $ 615.4
BASIC AVERAGE COMMON SHARES OUTSTANDING 200.3 200.2 200.3 200.2
DILUTED AVERAGE COMMON SHARES OUTSTANDING 201.0 200.9 200.9 200.7
BASIC EARNINGS PER AVERAGE COMMON SHARE $ 1.21 $ 1.31 $ 1.84 $ 3.07
DILUTED EARNINGS PER AVERAGE COMMON SHARE $ 1.2 $ 1.31 $ 1.83 $ 3.07
Other comprehensive income, net of tax $ 0.2 $ 1.7    
Comprehensive income 242.1 264.5 $ 370.4 $ 625.8
OG&E [Member]        
Revenues from contracts with customers 923.0 1,250.6 2,056.8 2,619.7
Other revenues 22.4 20.2 50.8 44.1
Revenues, Total 945.4 1,270.8 2,107.6 2,663.8
FUEL, PURCHASED POWER AND DIRECT TRANSMISSION EXPENSE 333.8 673.8 716.2 1,322.8
OPERATING EXPENSES        
Other operation and maintenance 123.3 121.5 383.4 355.3
Depreciation and amortization 132.5 122.4 377.8 341.4
Taxes other than income 24.7 24.5 75.3 74.6
Operating expenses 280.5 268.4 836.5 771.3
OPERATING INCOME 331.1 328.6 554.9 569.7
OTHER INCOME (EXPENSE)        
Allowance for equity funds used during construction 4.5 2.4 14.1 4.6
Other net periodic benefit income (expense) 1.7 2.2 4.9 (1.0)
Other income 3.6 2.1 22.0 4.3
Other expense (2.0) (1.1) (4.7) (1.9)
Net other income 7.8 5.6 36.3 6.0
INTEREST EXPENSE        
Interest on long-term debt 51.1 39.8 149.2 116.9
Allowance for borrowed funds used during construction (1.9) (0.6) (5.3) (2.7)
Interest on short-term debt and other interest charges 1.8 1.0 4.9 4.0
Interest expense 51.0 40.2 148.8 118.2
INCOME BEFORE TAXES 287.9 294.0 442.4 457.5
INCOME TAX EXPENSE 41.8 40.9 64.6 64.7
NET INCOME 246.1 253.1 377.8 392.8
Other comprehensive income, net of tax 0.0 0.0 0.0 0.0
Comprehensive income $ 246.1 $ 253.1 $ 377.8 $ 392.8