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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
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 1,873.3	$ 1,545.6
Consolidated Operating Income (Loss)	600.3	433.2
Eliminations
Segment Reporting Information [Line Items]
Revenues	(116.8)	(107.2)
Gas Distribution Operations
Segment Reporting Information [Line Items]
Revenues	1,439.8	1,138.9
Consolidated Operating Income (Loss)	510.8	346.9
Gas Distribution Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	1,436.7	1,135.8
Gas Distribution Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	3.1	3.1
Electric Operations
Segment Reporting Information [Line Items]
Revenues	430.3	402.7
Consolidated Operating Income (Loss)	99.2	87.9
Electric Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	430.1	402.5
Electric Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	0.2	0.2
Corporate and Other
Segment Reporting Information [Line Items]
Revenues	120.0	111.2
Consolidated Operating Income (Loss)	(9.7)	(1.6)
Corporate and Other | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	6.5	7.3
Corporate and Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	$ 113.5	$ 103.9

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

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