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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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 1,089.5	$ 959.4	$ 4,146.0	$ 3,491.0
Consolidated Operating Income (Loss)	156.7	147.1	900.3	722.5
Eliminations
Segment Reporting Information [Line Items]
Revenues	(118.6)	(111.8)	(359.5)	(339.6)
Gas Distribution Operations
Segment Reporting Information [Line Items]
Revenues	575.5	475.3	2,759.6	2,191.5
Consolidated Operating Income (Loss)	33.4	11.0	624.8	419.1
Gas Distribution Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	572.4	472.3	2,750.2	2,182.4
Gas Distribution Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	3.1	3.0	9.4	9.1
Electric Operations
Segment Reporting Information [Line Items]
Revenues	516.5	479.1	1,384.1	1,285.5
Consolidated Operating Income (Loss)	123.3	140.4	295.1	307.9
Electric Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	516.3	478.9	1,383.5	1,284.9
Electric Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	0.2	0.2	0.6	0.6
Corporate and Other
Segment Reporting Information [Line Items]
Revenues	116.1	116.8	361.8	353.6
Consolidated Operating Income (Loss)	0.0	(4.3)	(19.6)	(4.5)
Corporate and Other | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	0.8	8.2	12.3	23.7
Corporate and Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	$ 115.3	$ 108.6	$ 349.5	$ 329.9

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

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