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Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenue:        
Revenue $ 430.2 $ 401.6 $ 1,674.5 $ 1,530.6
Operating expenses:        
Fuel, purchased power and cost of natural gas sold 112.0 94.5 595.7 518.2
Operations and maintenance 150.8 145.6 452.2 420.8
Depreciation and amortization 71.5 69.3 210.5 201.8
Taxes other than income taxes 17.2 16.4 50.0 50.0
Total operating expenses 351.5 325.8 1,308.4 1,190.8
Operating income 78.7 75.8 366.1 339.8
Other income (expense):        
Interest expense incurred net of amounts capitalized (50.6) (50.6) (152.2) (144.8)
Interest income 1.2 5.4 2.6 12.9
Other income (expense), net 0.6 (1.3) 1.1 (1.7)
Total other (expense) (48.8) (46.5) (148.5) (133.6)
Income before income taxes 29.9 29.3 217.6 206.2
Income tax (expense) (4.0) (2.9) (26.5) (23.6)
Net income 25.9 26.4 191.1 182.6
Net income attributable to non-controlling interest (1.0) (2.0) (4.5) (7.6)
Net income available for common stock $ 24.9 $ 24.4 $ 186.6 $ 175.0
Earnings per share of common stock:        
Earnings per share, Basic (usd per share) $ 0.34 $ 0.35 $ 2.58 $ 2.53
Earnings per share, Diluted (usd per share) $ 0.34 $ 0.35 $ 2.58 $ 2.52
Weighted average common shares outstanding:        
Basic (in shares) 72.8 70.5 72.3 69.2
Diluted (in shares) 72.9 70.6 72.4 69.3