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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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Revenues	$ 1,084.7	$ 1,090.0	$ 2,791.0	$ 3,056.0
Consolidated Operating Income (Loss)	237.0	168.9	820.4	699.9
Total Assets	29,897.6		29,897.6		$ 31,077.2
Eliminations
Segment Reporting Information [Line Items]
Revenues	(142.3)	(126.0)	(285.7)	(246.0)
Corporate and Other
Segment Reporting Information [Line Items]
Revenues	139.1	123.0	279.2	239.9
Consolidated Operating Income (Loss)	(1.9)	4.0	3.1	6.2
Total Assets	1,248.6		1,248.6		3,450.1
Corporate and Other \| Unaffiliated
Segment Reporting Information [Line Items]
Revenues	0.1	0.2	0.3	0.4
Corporate and Other \| Intersegment
Segment Reporting Information [Line Items]
Revenues	139.0	122.8	278.9	239.5
Columbia Operations
Segment Reporting Information [Line Items]
Revenues	490.5	524.7	1,447.4	1,576.6
Consolidated Operating Income (Loss)	96.6	101.1	458.6	452.9
Total Assets	13,863.5		13,863.5		13,664.5
Columbia Operations \| Unaffiliated
Segment Reporting Information [Line Items]
Revenues	487.4	521.6	1,441.1	1,570.5
Columbia Operations \| Intersegment
Segment Reporting Information [Line Items]
Revenues	3.1	3.1	6.3	6.1
NIPSCO Operations
Segment Reporting Information [Line Items]
Revenues	597.4	568.3	1,350.1	1,485.5
Consolidated Operating Income (Loss)	142.3	63.8	358.7	240.8
NIPSCO Operations \| Unaffiliated
Segment Reporting Information [Line Items]
Revenues	597.2	568.2	1,349.6	1,485.1
Total Assets	14,785.5		14,785.5		$ 13,962.6
NIPSCO Operations \| Intersegment
Segment Reporting Information [Line Items]
Revenues	$ 0.2	$ 0.1	$ 0.5	$ 0.4