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Report of Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]                  
Operating revenues $ 1,270.8     $ 864.4     $ 2,663.8 $ 3,072.4  
Fuel, purchased power and direct transmission expense 673.8     330.1     1,322.8 1,876.9  
Other operation and maintenance 131.4     115.4     364.5 343.9  
Depreciation and amortization 122.4     108.6     341.4 310.2  
Taxes other than income 25.3     25.5     77.5 78.5  
OPERATING INCOME 317.9     284.8     557.6 462.9  
Income (Loss) from Equity Method Investments 0.0     41.2     0.0 127.9  
Other income (expense) (0.7)     2.1     20.3 2.9  
Interest expense 42.2     39.5     124.7 118.8  
Income tax expense 51.6     36.1     119.9 56.8  
Net income (loss) 262.8 $ 73.1 $ 279.5 252.5 $ 112.9 $ 52.7 615.4 418.1  
Investment in unconsolidated affiliates       449.5       449.5  
Total assets 12,604.0     12,177.5     12,604.0 12,177.5 $ 12,606.4
Gain (Loss) on Disposition of Assets               127.9  
Equity Securities, FV-NI, Gain (Loss) 39.4     0.0     282.1 0.0  
Electric Utility [Member]                  
Segment Reporting Information [Line Items]                  
Operating revenues 1,270.8     864.4     2,663.8 3,072.4  
Fuel, purchased power and direct transmission expense             1,322.8 1,876.9  
Other operation and maintenance             355.3 344.4  
Depreciation and amortization             341.4 310.2  
Taxes other than income             74.6 75.3  
OPERATING INCOME 328.6     285.3     569.7 465.6  
Income (Loss) from Equity Method Investments       0.0       0.0  
Other income (expense) 5.6     2.9     6.0 5.8  
Interest expense 40.2     38.0     118.2 114.3  
Income tax expense 40.9     26.4     64.7 37.0  
Net income (loss) 253.1     223.8     392.8 320.1  
Investment in unconsolidated affiliates       0.0       0.0  
Total assets 12,233.8     11,597.9     12,233.8 11,597.9  
Equity Securities, FV-NI, Gain (Loss) 0.0           0.0    
Natural Gas Midstream 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 10.5     0.3     11.7 2.3  
Depreciation and amortization 0.0     0.0     0.0 0.0  
Taxes other than income 0.1     0.1     0.2 0.3  
OPERATING INCOME (10.6)     (0.4)     (11.9) (2.6)  
Income (Loss) from Equity Method Investments       41.2       127.9  
Other income (expense) (7.8)     (0.5)     13.3 (1.2)  
Interest expense 0.0     0.0     0.0 0.0  
Income tax expense 4.9     9.5     56.2 23.2  
Net income (loss) 16.1     30.8     227.3 100.9  
Investment in unconsolidated affiliates       449.5       449.5  
Total assets 1.3     451.8     1.3 451.8  
Equity Securities, FV-NI, Gain (Loss) 39.4           282.1    
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)     (0.7)     (2.5) (2.8)  
Depreciation and amortization 0.0     0.0     0.0 0.0  
Taxes other than income 0.7     0.8     2.7 2.9  
OPERATING INCOME (0.1)     (0.1)     (0.2) (0.1)  
Income (Loss) from Equity Method Investments       0.0       0.0  
Other income (expense) 2.6     (0.2)     2.6 (0.8)  
Interest expense 3.1     1.6     8.1 5.4  
Income tax expense 5.8     0.2     (1.0) (3.4)  
Net income (loss) (6.4)     (2.1)     (4.7) (2.9)  
Investment in unconsolidated affiliates       0.0       0.0  
Total assets 933.9     293.3     933.9 293.3  
Equity Securities, FV-NI, Gain (Loss) 0.0           0.0    
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  
Income (Loss) from Equity Method Investments       0.0       0.0  
Other income (expense) (1.1)     (0.1)     (1.6) (0.9)  
Interest expense (1.1)     (0.1)     (1.6) (0.9)  
Income tax expense 0.0     0.0     0.0 0.0  
Net income (loss) 0.0     0.0     0.0 0.0  
Investment in unconsolidated affiliates       0.0       0.0  
Total assets (565.0)     $ (165.5)     (565.0) $ (165.5)  
Equity Securities, FV-NI, Gain (Loss) $ 0.0           $ 0.0