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Report of Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]              
Operating revenues $ 605.0   $ 803.7   $ 1,162.2 $ 1,393.0  
Fuel, purchased power and direct transmission expense 181.8   393.3   382.4 649.0  
Other operation and maintenance 128.3   118.1   258.7 233.1  
Depreciation and amortization 124.1   111.6   245.3 219.0  
Taxes other than income 24.4   24.1   52.9 52.2  
OPERATING INCOME 146.4   156.6   222.9 239.7  
Gain (loss) on equity securities 0.0   (39.6)   0.0 242.7  
Other income 14.5   11.7   30.9 21.0  
Interest expense 57.7   42.4   105.5 82.5  
Income tax expense (benefit) 14.8   13.2   21.6 68.3  
Net income (loss) 88.4 $ 38.3 73.1 $ 279.5 126.7 352.6  
Total assets 12,604.6   12,838.0   12,604.6 12,838.0 $ 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 (loss) on equity securities     0.0     0.0  
Other income (3.1)   (0.4)   (6.5) (0.5)  
Interest expense (3.1)   (0.4)   (6.5) (0.5)  
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 (575.1)   (632.8)   (575.1) (632.8)  
Electrics Company [Member]              
Segment Reporting Information [Line Items]              
Operating revenues 605.0   803.7   1,162.2 1,393.0  
Fuel, purchased power and direct transmission expense 181.8   393.3   382.4 649.0  
Other operation and maintenance 128.6   118.3   260.1 233.8  
Depreciation and amortization 124.1   111.6   245.3 219.0  
Taxes other than income 23.5   23.3   50.6 50.1  
OPERATING INCOME 147.0   157.2   223.8 241.1  
Gain (loss) on equity securities     0.0     0.0  
Other income 13.2   (0.3)   28.5 0.4  
Interest expense 52.1   39.8   97.8 78.0  
Income tax expense (benefit) 16.2   16.4   22.8 23.8  
Net income (loss) 91.9   100.7   131.7 139.7  
Total assets 12,492.9   12,317.2   12,492.9 12,317.2  
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     0.5     1.2  
Depreciation and amortization     0.0     0.0  
Taxes other than income     0.1     0.1  
OPERATING INCOME     (0.6)     (1.3)  
Gain (loss) on equity securities     (39.6)     242.7  
Other income     12.4     21.1  
Interest expense     0.0     0.0  
Income tax expense (benefit)     (8.9)     51.3  
Net income (loss)     (18.9)     211.2  
Total assets     401.7     401.7  
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 (0.3)   (0.7)   (1.4) (1.9)  
Depreciation and amortization 0.0   0.0   0.0 0.0  
Taxes other than income 0.9   0.7   2.3 2.0  
OPERATING INCOME (0.6)   0.0   (0.9) (0.1)  
Gain (loss) on equity securities     0.0     0.0  
Other income 4.4   0.0   8.9 0.0  
Interest expense 8.7   3.0   14.2 5.0  
Income tax expense (benefit) (1.4)   5.7   (1.2) (6.8)  
Net income (loss) (3.5)   (8.7)   (5.0) 1.7  
Total assets $ 686.8   $ 751.9   $ 686.8 $ 751.9