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Segments Of Business (Schedule Of Operating Income Derived From Revenues And Expenses By Segment) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Operating Revenues $ 5,505.4 $ 5,850.6 $ 4,899.6
Operating Income 1,295.5 1,265.8 1,006.9
Consolidated Depreciation and Amortization 908.2 820.8 748.4
Consolidated Assets 31,077.2 26,736.6 24,156.9
Payments to Acquire Property Plant and Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments 2,690.7 2,298.0 1,940.4
Gas Distribution Operations      
Segment Reporting Information [Line Items]      
Operating Revenues 3,720.4 4,007.2 3,171.2
Intersegment 3,732.7 4,019.8 3,183.5
Operating Income 901.9 915.8 617.5
Consolidated Depreciation and Amortization 464.6 415.9 383.0
Consolidated Assets 18,122.8 16,986.5 15,153.7
Payments to Acquire Property Plant and Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments 1,715.2 1,682.3 1,406.4
Electric Operations      
Segment Reporting Information [Line Items]      
Operating Revenues 1,784.2 1,830.9 1,696.3
Intersegment 1,785.0 1,831.7 1,697.1
Operating Income 378.7 362.4 387.8
Consolidated Depreciation and Amortization 400.9 362.9 329.4
Consolidated Assets 9,250.5 7,992.6 7,178.9
Payments to Acquire Property Plant and Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments 739.2 574.5 517.4
Corporate and Other      
Segment Reporting Information [Line Items]      
Operating Revenues 0.8 12.5 32.1
Intersegment 504.6 477.5 492.4
Operating Income 14.9 (12.4) 1.6
Consolidated Depreciation and Amortization 42.7 42.0 36.0
Consolidated Assets 3,703.9 1,757.5 1,824.3
Payments to Acquire Property Plant and Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments 236.3 41.2 16.6
Unaffiliated | Gas Distribution Operations      
Segment Reporting Information [Line Items]      
Operating Revenues 3,720.4 4,007.2 3,171.2
Unaffiliated | Electric Operations      
Segment Reporting Information [Line Items]      
Operating Revenues 1,784.2 1,830.9 1,696.3
Unaffiliated | Corporate and Other      
Segment Reporting Information [Line Items]      
Operating Revenues 0.8 12.5 32.1
Intersegment | Gas Distribution Operations      
Segment Reporting Information [Line Items]      
Intersegment 12.3 12.6 12.3
Intersegment | Electric Operations      
Segment Reporting Information [Line Items]      
Intersegment 0.8 0.8 0.8
Intersegment | Corporate and Other      
Segment Reporting Information [Line Items]      
Intersegment 503.8 465.0 460.3
Eliminations      
Segment Reporting Information [Line Items]      
Intersegment $ (516.9) $ (478.4) $ (473.4)