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Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenue:      
Revenue $ 2,331.3 $ 2,551.8 $ 1,949.1
Operating expenses:      
Fuel, purchased power and cost of natural gas sold 982.9 1,230.6 741.9
Operations and maintenance 552.0 548.4 501.7
Depreciation and amortization 256.8 250.9 236.0
Taxes - property and production 66.9 66.7 60.1
Total operating expenses 1,858.6 2,096.6 1,539.7
Operating income 472.7 455.2 409.4
Other income (expense):      
Interest expense incurred net of amounts capitalized (180.0) (162.6) (154.1)
Interest income 12.1 1.6 1.7
Other income (expense), net (3.2) 1.8 1.4
Total other income (expense) (171.1) (159.2) (151.0)
Income before income taxes 301.6 296.0 258.4
Income tax (expense) (25.6) (25.2) (7.2)
Net income 276.0 270.8 251.2
Net income attributable to non-controlling interest (13.8) (12.4) (14.5)
Net income available for common stock $ 262.2 $ 258.4 $ 236.7
Earnings per share of common stock:      
Earnings per share, Basic (usd per share) $ 3.91 $ 3.98 $ 3.74
Earnings per share, Diluted (usd per share) $ 3.91 $ 3.97 $ 3.74
Weighted average common shares outstanding:      
Basic (in shares) 67.0 64.9 63.2
Diluted (in shares) 67.1 65.0 63.3