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CONDENSED INCOME STATEMENTS - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Income Statement [Abstract]        
Operating revenues $ 482.7 $ 466.3 $ 1,454.5 $ 1,375.5
Operating expenses        
Cost of sales 117.3 126.6 481.1 440.3
Other operation and maintenance 119.3 123.3 368.8 364.4
Depreciation and amortization 70.3 67.4 208.3 199.9
Property and revenue taxes 12.7 11.1 38.5 33.5
Total operating expenses 319.6 328.4 1,096.7 1,038.1
Operating income 163.1 137.9 357.8 337.4
Other income, net 8.0 5.3 25.0 13.8
Interest expense 25.5 24.4 73.2 72.6
Other expense (17.5) (19.1) (48.2) (58.8)
Income before income taxes 145.6 118.8 309.6 278.6
Income tax expense 23.9 22.5 48.7 51.3
Net income $ 121.7 $ 96.3 $ 260.9 $ 227.3