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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues from contracts with customers $ 1,028.4 $ 945.2 $ 2,489.2 $ 2,171.9
Other revenues 16.6 20.2 45.1 52.9
Operating revenues 1,045.0 965.4 2,534.3 2,224.8
FUEL, PURCHASED POWER AND DIRECT TRANSMISSION EXPENSE 388.5 350.1 973.6 776.2
OPERATING EXPENSES        
Other operation and maintenance 143.3 131.4 392.2 394.2
Depreciation and amortization 146.7 144.0 424.7 408.7
Taxes other than income 25.2 26.7 82.6 82.6
Operating expenses 315.2 302.1 899.5 885.5
OPERATING INCOME 341.3 313.2 661.2 563.1
OTHER INCOME (EXPENSE)        
Allowance for equity funds used during construction 6.3 6.9 19.3 18.2
Other net periodic benefit income (expense) (2.7) 1.7 (8.2) 5.0
Other income 6.1 6.8 30.3 20.2
Other expense (4.6) (4.7) (14.3) (15.8)
Net other income 5.1 10.7 27.1 27.6
INTEREST EXPENSE        
Interest on long-term debt 66.4 59.6 194.4 166.5
Allowance for borrowed funds used during construction (3.7) (3.9) (11.9) (10.7)
Interest on short-term debt and other interest charges 6.9 8.5 26.6 33.5
Interest expense 69.6 64.2 209.1 189.3
INCOME BEFORE TAXES 276.8 259.7 479.2 401.4
INCOME TAX EXPENSE 45.5 41.0 77.7 61.8
NET INCOME $ 231.3 $ 218.7 $ 401.5 $ 339.6
BASIC AVERAGE COMMON SHARES OUTSTANDING 201.5 200.9 201.3 200.7
DILUTED AVERAGE COMMON SHARES OUTSTANDING 202.1 201.5 202.0 201.2
BASIC EARNINGS PER AVERAGE COMMON SHARE $ 1.15 $ 1.09 $ 1.99 $ 1.69
DILUTED EARNINGS PER AVERAGE COMMON SHARE $ 1.14 $ 1.09 $ 1.99 $ 1.69
Other comprehensive income, net of tax $ 0.1 $ 0.1    
Comprehensive income 231.4 218.8 $ 401.8 $ 343.7
OG&E [Member]        
Revenues from contracts with customers 1,028.4 945.2 2,489.2 2,171.9
Other revenues 16.6 20.2 45.1 52.9
Operating revenues 1,045.0 965.4 2,534.3 2,224.8
FUEL, PURCHASED POWER AND DIRECT TRANSMISSION EXPENSE 388.5 350.1 973.6 776.2
OPERATING EXPENSES        
Other operation and maintenance 143.5 131.4 391.6 394.0
Depreciation and amortization 146.7 144.0 424.7 408.7
Taxes other than income 25.2 26.7 82.6 82.6
Operating expenses 315.4 302.1 898.9 885.3
OPERATING INCOME 341.1 313.2 661.8 563.3
OTHER INCOME (EXPENSE)        
Allowance for equity funds used during construction 6.3 6.9 19.3 18.2
Other net periodic benefit income (expense) (2.7) 1.9 (7.8) 5.5
Other income 4.2 3.4 13.6 8.6
Other expense (0.5) (0.6) (1.9) (3.9)
Net other income 7.3 11.6 23.2 28.4
INTEREST EXPENSE        
Interest on long-term debt 60.6 53.6 177.0 156.0
Allowance for borrowed funds used during construction (3.7) (3.9) (11.9) (10.7)
Interest on short-term debt and other interest charges (2.7) 4.4 9.3 15.1
Interest expense 54.2 54.1 174.4 160.4
INCOME BEFORE TAXES 294.2 270.7 510.6 431.3
INCOME TAX EXPENSE 51.3 45.7 89.0 71.8
NET INCOME 242.9 225.0 421.6 359.5
Other comprehensive income, net of tax 0.0 0.0 0.0 0.0
Comprehensive income $ 242.9 $ 225.0 $ 421.6 $ 359.5