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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 959.4	$ 902.5	$ 3,491.0	$ 3,470.7
Consolidated Operating Income (Loss)	147.1	92.8	722.5	332.7
Eliminations
Segment Reporting Information [Line Items]
Revenues	(111.8)	(123.6)	(339.6)	(337.4)
Gas Distribution Operations
Segment Reporting Information [Line Items]
Revenues	475.3	473.1	2,191.5	2,313.4
Consolidated Operating Income (Loss)	11.0	(42.2)	419.1	38.0
Gas Distribution Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	472.3	470.1	2,182.4	2,304.4
Gas Distribution Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	3.0	3.0	9.1	9.0
Electric Operations
Segment Reporting Information [Line Items]
Revenues	479.1	432.3	1,285.5	1,166.2
Consolidated Operating Income (Loss)	140.4	130.0	307.9	295.4
Electric Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	478.9	432.2	1,284.9	1,165.7
Electric Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	0.2	0.1	0.6	0.5
Corporate and Other
Segment Reporting Information [Line Items]
Revenues	116.8	120.7	353.6	328.5
Consolidated Operating Income (Loss)	(4.3)	5.0	(4.5)	(0.7)
Corporate and Other | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	8.2	0.2	23.7	0.6
Corporate and Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	$ 108.6	$ 120.5	$ 329.9	$ 327.9

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

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