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Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Revenue:        
Revenue $ 401.6 $ 407.1 $ 1,530.6 $ 1,739.6
Operating expenses:        
Fuel, purchased power and cost of natural gas sold 94.5 102.2 518.2 749.8
Operations and maintenance 145.6 125.7 420.8 412.5
Depreciation and amortization 69.3 64.9 201.8 191.2
Taxes - property and production 16.4 16.5 50.0 49.9
Total operating expenses 325.8 309.3 1,190.8 1,403.4
Operating income 75.8 97.8 339.8 336.2
Other income (expense):        
Interest expense incurred net of amounts capitalized (50.6) (44.5) (144.8) (131.8)
Interest income 5.4 3.5 12.9 5.8
Other income (expense), net (1.3) (0.6) (1.7) (1.5)
Total other income (expense) (46.5) (41.6) (133.6) (127.5)
Income before income taxes 29.3 56.2 206.2 208.7
Income tax (expense) (2.9) (7.4) (23.6) (16.0)
Net income 26.4 48.8 182.6 192.7
Net income attributable to non-controlling interest (2.0) (3.4) (7.6) (10.2)
Net income available for common stock $ 24.4 $ 45.4 $ 175.0 $ 182.5
Earnings per share of common stock:        
Earnings per share, Basic (usd per share) $ 0.35 $ 0.67 $ 2.53 $ 2.74
Earnings per share, Diluted (usd per share) $ 0.35 $ 0.67 $ 2.52 $ 2.74
Weighted average common shares outstanding:        
Basic (in shares) 70.5 67.3 69.2 66.7
Diluted (in shares) 70.6 67.4 69.3 66.7