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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Revenues	$ 1,076.3	$ 1,027.4	$ 3,867.3	$ 4,083.4
Consolidated Operating Income (Loss)	218.3	233.0	1,038.7	932.9
Total Assets	30,828.1		30,828.1		$ 31,077.2
Eliminations
Segment Reporting Information [Line Items]
Revenues	(149.2)	(125.1)	(434.9)	(371.1)
Corporate and Other
Segment Reporting Information [Line Items]
Revenues	145.9	121.9	425.1	361.8
Consolidated Operating Income (Loss)	5.8	5.3	8.9	11.5
Total Assets	1,203.9		1,203.9		3,450.1
Corporate and Other | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	0.3	0.2	0.6	0.6
Corporate and Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	145.6	121.7	424.5	361.2
Columbia Operations
Segment Reporting Information [Line Items]
Revenues	426.7	414.0	1,874.1	1,990.6
Consolidated Operating Income (Loss)	41.2	54.6	499.8	507.5
Total Assets	14,174.1		14,174.1		13,664.5
Columbia Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	423.4	411.0	1,864.5	1,981.5
Columbia Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	3.3	3.0	9.6	9.1
NIPSCO Operations
Segment Reporting Information [Line Items]
Revenues	652.9	616.6	2,003.0	2,102.1
Consolidated Operating Income (Loss)	171.3	173.1	530.0	413.9
NIPSCO Operations | Unaffiliated
Segment Reporting Information [Line Items]
Revenues	652.6	616.2	2,002.2	2,101.3
Total Assets	15,450.1		15,450.1		$ 13,962.6
NIPSCO Operations | Intersegment
Segment Reporting Information [Line Items]
Revenues	$ 0.3	$ 0.4	$ 0.8	$ 0.8

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Amount of asset recognized for present right to economic benefit.

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