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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 902.5	$ 931.5	$ 3,470.7	$ 3,811.7
Consolidated Operating Income (Loss)	92.8	91.0	332.7	928.7
Gas Distribution Operations
Segment Reporting Information [Line Items]
Revenues	473.1	466.9	2,313.4	2,516.1
Consolidated Operating Income (Loss)	(42.2)	(48.6)	38.0	605.8
Gas Distribution Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	470.1	463.6	2,304.4	2,506.2
Gas Distribution Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	3.0	3.3	9.0	9.9
Electric Operations
Segment Reporting Information [Line Items]
Revenues	432.3	467.9	1,166.2	1,305.5
Consolidated Operating Income (Loss)	130.0	140.7	295.4	321.4
Electric Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	432.2	467.7	1,165.7	1,304.9
Electric Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	0.1	0.2	0.5	0.6
Corporate and Other
Segment Reporting Information [Line Items]
Revenues	120.7	117.1	328.5	342.8
Consolidated Operating Income (Loss)	5.0	(1.1)	(0.7)	1.5
Corporate and Other | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	0.2	0.2	0.6	0.6
Corporate and Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	120.5	116.9	327.9	342.2
Eliminations
Segment Reporting Information [Line Items]
Revenues	$ (123.6)	$ (120.4)	$ (337.4)	$ (352.7)

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

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