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Business Segment Information (Schedule Of Operating Income Derived From Revenues And Expenses By Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Segment Reporting Information [Line Items]        
Revenues $ 1,090.0 $ 1,183.2 $ 3,056.0 $ 3,056.5
Consolidated Operating Income (Loss) 168.9 143.3 699.9 743.6
Eliminations        
Segment Reporting Information [Line Items]        
Revenues (126.0) (124.1) (246.0) (240.9)
Gas Distribution Operations        
Segment Reporting Information [Line Items]        
Revenues 695.9 744.3 2,200.3 2,184.1
Consolidated Operating Income (Loss) 115.4 80.6 562.3 591.4
Gas Distribution Operations | Unaffiliated        
Segment Reporting Information [Line Items]        
Revenues 692.8 741.1 2,194.1 2,177.8
Gas Distribution Operations | Intersegment        
Segment Reporting Information [Line Items]        
Revenues 3.1 3.2 6.2 6.3
Electric Operations        
Segment Reporting Information [Line Items]        
Revenues 397.1 437.3 861.8 867.6
Consolidated Operating Income (Loss) 49.6 72.6 131.5 171.8
Electric Operations | Unaffiliated        
Segment Reporting Information [Line Items]        
Revenues 397.0 437.1 861.5 867.2
Electric Operations | Intersegment        
Segment Reporting Information [Line Items]        
Revenues 0.1 0.2 0.3 0.4
Corporate and Other        
Segment Reporting Information [Line Items]        
Revenues 123.0 125.7 239.9 245.7
Consolidated Operating Income (Loss) 3.9 (9.9) 6.1 (19.6)
Corporate and Other | Unaffiliated        
Segment Reporting Information [Line Items]        
Revenues 0.2 5.0 0.4 11.5
Corporate and Other | Intersegment        
Segment Reporting Information [Line Items]        
Revenues $ 122.8 $ 120.7 $ 239.5 $ 234.2