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Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Revenue:    
Revenue $ 726.4 $ 921.2
Operating expenses:    
Fuel, purchased power and cost of natural gas sold 316.6 526.3
Operations and maintenance 133.6 141.0
Depreciation and amortization 65.9 61.6
Taxes - property and production 17.0 17.4
Total operating expenses 533.1 746.3
Operating income 193.3 174.9
Other income (expense):    
Interest expense incurred net of amounts capitalized (46.0) (44.1)
Interest income 2.0 0.6
Other income (expense), net (0.8) 0.7
Total other income (expense) (44.8) (42.8)
Income before income taxes 148.5 132.1
Income tax (expense) (16.9) (14.7)
Net income 131.6 117.4
Net income attributable to non-controlling interest (3.7) (3.3)
Net income available for common stock $ 127.9 $ 114.1
Earnings per share of common stock:    
Earnings per share, Basic (usd per share) $ 1.88 $ 1.73
Earnings per share, Diluted (usd per share) $ 1.87 $ 1.73
Weighted average common shares outstanding:    
Basic (in shares) 68.2 66.0
Diluted (in shares) 68.3 66.1