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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 986.0	$ 962.7	$ 2,531.6	$ 2,568.2
Consolidated Operating Income (Loss)	142.2	91.7	575.4	239.9
Eliminations
Segment Reporting Information [Line Items]
Revenues	(120.6)	(103.9)	(227.8)	(213.8)
Gas Distribution Operations
Segment Reporting Information [Line Items]
Revenues	577.3	609.3	1,716.2	1,840.3
Consolidated Operating Income (Loss)	61.2	1.7	408.1	80.2
Gas Distribution Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	574.3	606.3	1,710.1	1,834.3
Gas Distribution Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	3.0	3.0	6.1	6.0
Electric Operations
Segment Reporting Information [Line Items]
Revenues	403.7	356.4	806.4	733.9
Consolidated Operating Income (Loss)	79.6	86.9	167.5	165.4
Electric Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	403.5	356.2	806.0	733.5
Electric Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	0.2	0.2	0.4	0.4
Corporate and Other
Segment Reporting Information [Line Items]
Revenues	125.6	100.9	236.8	207.8
Consolidated Operating Income (Loss)	1.4	3.1	(0.2)	(5.7)
Corporate and Other | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	8.2	0.2	15.5	0.4
Corporate and Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	$ 117.4	$ 100.7	$ 221.3	$ 207.4

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The net result for the period of deducting operating expenses from operating revenues.

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