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Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenue:      
Revenue $ 2,127.7 $ 2,331.3 $ 2,551.8
Operating expenses:      
Fuel, purchased power and cost of natural gas sold 730.3 982.9 1,230.6
Operations and maintenance 557.0 552.0 548.4
Depreciation and amortization 270.1 256.8 250.9
Taxes other than income taxes 67.2 66.9 66.7
Total operating expenses 1,624.6 1,858.6 2,096.6
Operating income 503.1 472.7 455.2
Other income (expense):      
Interest expense incurred net of amounts capitalized (195.2) (180.0) (162.6)
Interest income 13.5 12.1 1.6
Other income (expense), net (1.4) (3.2) 1.8
Total other income (expense) (183.1) (171.1) (159.2)
Income before income taxes 320.0 301.6 296.0
Income tax (expense) (36.3) (25.6) (25.2)
Net income 283.7 276.0 270.8
Net income attributable to non-controlling interest (10.6) (13.8) (12.4)
Net income available for common stock $ 273.1 $ 262.2 $ 258.4
Earnings per share of common stock:      
Earnings per share, Basic (usd per share) $ 3.91 $ 3.91 $ 3.98
Earnings per share, Diluted (usd per share) $ 3.91 $ 3.91 $ 3.97
Weighted average common shares outstanding:      
Basic (in shares) 69.8 67.0 64.9
Diluted (in shares) 69.9 67.1 65.0