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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)

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