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Report of Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]                  
Operating revenues $ 945.4     $ 1,270.8     $ 2,107.6 $ 2,663.8  
Fuel, purchased power and direct transmission expense 333.8     673.8     716.2 1,322.8  
Other operation and maintenance 122.7     131.4     381.4 364.5  
Depreciation and amortization 132.5     122.4     377.8 341.4  
Taxes other than income 25.3     25.3     78.2 77.5  
OPERATING INCOME 331.1     317.9     554.0 557.6  
Gain on equity securities 0.0     39.4     0.0 282.1  
Other income (expense) 6.6     (0.7)     37.5 20.3  
Interest expense 57.4     42.2     162.9 124.7  
Income tax expense (benefit) 38.4     51.6     60.0 119.9  
Net income (loss) 241.9 $ 88.4 $ 38.3 262.8 $ 73.1 $ 279.5 368.6 615.4  
Total assets 12,743.2     12,604.0     12,743.2 12,604.0 $ 12,544.7
Eliminations [Member]                  
Segment Reporting Information [Line Items]                  
Operating revenues 0.0     0.0     0.0 0.0  
Fuel, purchased power and direct transmission expense 0.0     0.0     0.0 0.0  
Other operation and maintenance 0.0     0.0     0.0 0.0  
Depreciation and amortization 0.0     0.0     0.0 0.0  
Taxes other than income 0.0     0.0     0.0 0.0  
OPERATING INCOME 0.0     0.0     0.0 0.0  
Gain on equity securities       0.0       0.0  
Other income (expense) (0.8)     (1.1)     (7.3) (1.6)  
Interest expense (0.8)     (1.1)     (7.3) (1.6)  
Income tax expense (benefit) 0.0     0.0     0.0 0.0  
Net income (loss) 0.0     0.0     0.0 0.0  
Total assets (179.6)     (565.0)     (179.6) (565.0)  
Electrics Company [Member]                  
Segment Reporting Information [Line Items]                  
Operating revenues 945.4     1,270.8     2,107.6 2,663.8  
Fuel, purchased power and direct transmission expense 333.8     673.8     716.2 1,322.8  
Other operation and maintenance 123.3     121.5     383.4 355.3  
Depreciation and amortization 132.5     122.4     377.8 341.4  
Taxes other than income 24.7     24.5     75.3 74.6  
OPERATING INCOME 331.1     328.6     554.9 569.7  
Gain on equity securities       0.0       0.0  
Other income (expense) 7.8     5.6     36.3 6.0  
Interest expense 51.0     40.2     148.8 118.2  
Income tax expense (benefit) 41.8     40.9     64.6 64.7  
Net income (loss) 246.1     253.1     377.8 392.8  
Total assets 12,610.6     12,233.8     12,610.6 12,233.8  
Natural Gas Midstream Operations [Member]                  
Segment Reporting Information [Line Items]                  
Operating revenues       0.0       0.0  
Fuel, purchased power and direct transmission expense       0.0       0.0  
Other operation and maintenance       10.5       11.7  
Depreciation and amortization       0.0       0.0  
Taxes other than income       0.1       0.2  
OPERATING INCOME       (10.6)       (11.9)  
Gain on equity securities       39.4       282.1  
Other income (expense)       (7.8)       13.3  
Interest expense       0.0       0.0  
Income tax expense (benefit)       4.9       56.2  
Net income (loss)       16.1       227.3  
Total assets       1.3       1.3  
Other Operations [Member]                  
Segment Reporting Information [Line Items]                  
Operating revenues 0.0     0.0     0.0 0.0  
Fuel, purchased power and direct transmission expense 0.0     0.0     0.0 0.0  
Other operation and maintenance (0.6)     (0.6)     (2.0) (2.5)  
Depreciation and amortization 0.0     0.0     0.0 0.0  
Taxes other than income 0.6     0.7     2.9 2.7  
OPERATING INCOME 0.0     (0.1)     (0.9) (0.2)  
Gain on equity securities       0.0       0.0  
Other income (expense) (0.4)     2.6     8.5 2.6  
Interest expense 7.2     3.1     21.4 8.1  
Income tax expense (benefit) (3.4)     5.8     (4.6) (1.0)  
Net income (loss) (4.2)     (6.4)     (9.2) (4.7)  
Total assets $ 312.2     $ 933.9     $ 312.2 $ 933.9