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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, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 1,545.6	$ 1,605.5
Consolidated Operating Income (Loss)	433.2	148.2
Eliminations
Segment Reporting Information [Line Items]
Revenues	(107.2)	(109.9)
Gas Distribution Operations
Segment Reporting Information [Line Items]
Revenues	1,138.9	1,231.0
Consolidated Operating Income (Loss)	346.9	78.5
Gas Distribution Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	1,135.8	1,228.0
Gas Distribution Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	3.1	3.0
Electric Operations
Segment Reporting Information [Line Items]
Revenues	402.7	377.5
Consolidated Operating Income (Loss)	87.9	78.5
Electric Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	402.5	377.3
Electric Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	0.2	0.2
Corporate and Other
Segment Reporting Information [Line Items]
Revenues	111.2	106.9
Consolidated Operating Income (Loss)	(1.6)	(8.8)
Corporate and Other | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	7.3	0.2
Corporate and Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	$ 103.9	$ 106.7

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

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