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Segments Of Business (Schedule Of Operating Income Derived From Revenues And Expenses By Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
Operating Revenues                 $ 4,681.7 $ 5,208.9 $ 5,114.5
Operating Income (Loss) $ 218.1 $ 92.8 $ 91.7 $ 148.2 $ (38.0) $ 91.0 $ 463.5 $ 374.2 550.8 890.7 124.7
Consolidated Depreciation and Amortization                 725.9 717.4 599.6
Consolidated Assets 22,040.5       22,659.8       22,040.5 22,659.8 21,804.0
Payments to Acquire Property Plant and Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments                 1,720.8 1,867.8 1,814.6
Gas Distribution Operations                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 3,128.1 3,509.7 3,406.4
Intersegment                 3,140.2 3,522.8 3,419.5
Operating Income (Loss)                 199.1 675.4 (254.1)
Consolidated Depreciation and Amortization                 363.1 403.2 301.0
Consolidated Assets 13,433.0       14,224.5       13,433.0 14,224.5 13,527.0
Payments to Acquire Property Plant and Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments                 1,266.9 1,380.3 1,315.3
Electric Operations                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 1,535.9 1,698.4 1,707.4
Intersegment                 1,536.6 1,699.2 1,708.2
Operating Income (Loss)                 348.8 406.8 386.1
Consolidated Depreciation and Amortization                 321.3 277.3 262.9
Consolidated Assets 6,443.1       6,027.6       6,443.1 6,027.6 5,735.2
Payments to Acquire Property Plant and Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments                 422.8 468.9 499.3
Corporate and Other                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 17.7 0.8 0.7
Intersegment                 467.5 468.9 518.3
Operating Income (Loss)                 2.9 (191.5) (7.3)
Consolidated Depreciation and Amortization                 41.5 36.9 35.7
Consolidated Assets $ 2,164.4       $ 2,407.7       2,164.4 2,407.7 2,541.8
Payments to Acquire Property Plant and Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments                 31.1 18.6 0.0
Unaffiliated | Gas Distribution Operations                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 3,128.1 3,509.7 3,406.4
Unaffiliated | Electric Operations                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 1,535.9 1,698.4 1,707.4
Unaffiliated | Corporate and Other                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 17.7 0.8 0.7
Intersegment | Gas Distribution Operations                      
Segment Reporting Information [Line Items]                      
Intersegment                 12.1 13.1 13.1
Intersegment | Electric Operations                      
Segment Reporting Information [Line Items]                      
Intersegment                 0.7 0.8 0.8
Intersegment | Corporate and Other                      
Segment Reporting Information [Line Items]                      
Intersegment                 449.8 468.1 517.6
Eliminations                      
Segment Reporting Information [Line Items]                      
Intersegment                 $ (462.6) $ (482.0) $ (531.5)