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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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 1,183.2	$ 986.0	$ 3,056.5	$ 2,531.6
Consolidated Operating Income (Loss)	143.3	142.2	743.6	575.4
Eliminations
Segment Reporting Information [Line Items]
Revenues	(124.1)	(120.6)	(240.9)	(227.8)
Gas Distribution Operations
Segment Reporting Information [Line Items]
Revenues	744.3	577.3	2,184.1	1,716.2
Consolidated Operating Income (Loss)	80.6	61.2	591.4	408.1
Gas Distribution Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	741.1	574.3	2,177.8	1,710.1
Gas Distribution Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	3.2	3.0	6.3	6.1
Electric Operations
Segment Reporting Information [Line Items]
Revenues	437.3	403.7	867.6	806.4
Consolidated Operating Income (Loss)	72.6	79.6	171.8	167.5
Electric Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	437.1	403.5	867.2	806.0
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	125.7	125.6	245.7	236.8
Consolidated Operating Income (Loss)	(9.9)	1.4	(19.6)	(0.2)
Corporate and Other | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	5.0	8.2	11.5	15.5
Corporate and Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	$ 120.7	$ 117.4	$ 234.2	$ 221.3

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

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