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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Customer revenues	$ 5,282.9	$ 5,282.9	$ 5,347.8	$ 5,738.6
Other revenues	172.2	172.2	157.6	112.0
Total Operating Revenues	5,455.1	5,455.1	5,505.4	5,850.6
NiSource Electric Generation and Power Delivery
Disaggregation of Revenue [Line Items]
Customer revenues	1,829.5		1,701.0	1,735.5
NiSource Gas Distribution
Disaggregation of Revenue [Line Items]
Customer revenues		3,453.4	3,646.8	4,003.1
Electric Operations
Disaggregation of Revenue [Line Items]
Total Operating Revenues			2,770.7	2,886.2
Corporate Segment and Other Operating Segment
Disaggregation of Revenue [Line Items]
Customer revenues		0.0	0.0	0.0
Other revenues		0.9	0.8	12.5
Total Operating Revenues		0.9	0.8	12.5
NIPSCO Operations
Disaggregation of Revenue [Line Items]
Customer revenues		2,654.5	2,686.8	2,790.4
Other revenues		96.5	83.9	95.8
Total Operating Revenues	2,751.0
NIPSCO Operations | NIPSCO Electric Generation
Disaggregation of Revenue [Line Items]
Customer revenues		1,829.5	1,701.0	1,735.5
NIPSCO Operations | NIPSCO Gas Distribution
Disaggregation of Revenue [Line Items]
Customer revenues		825.0	985.8	1,054.9
Columbia Operations
Disaggregation of Revenue [Line Items]
Customer revenues		2,628.4	2,661.0	2,948.2
Other revenues		74.8	72.9	3.7
Total Operating Revenues		2,703.2	2,733.9	2,951.9
Residential | NiSource Electric Generation and Power Delivery
Disaggregation of Revenue [Line Items]
Customer revenues	649.9		583.9	592.4
Residential | NiSource Gas Distribution
Disaggregation of Revenue [Line Items]
Customer revenues		2,365.2	2,462.5	2,609.7
Residential | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues			635.0	691.5
Residential | Corporate Segment and Other Operating Segment
Disaggregation of Revenue [Line Items]
Customer revenues		0.0	0.0	0.0
Residential | NIPSCO Operations
Disaggregation of Revenue [Line Items]
Customer revenues		531.4
Residential | NIPSCO Operations | NIPSCO Electric Generation
Disaggregation of Revenue [Line Items]
Customer revenues		649.9	583.9	592.4
Residential | Columbia Operations
Disaggregation of Revenue [Line Items]
Customer revenues		1,833.8	1,827.5	1,918.2
Commercial | NiSource Electric Generation and Power Delivery
Disaggregation of Revenue [Line Items]
Customer revenues	620.4		578.1	571.0
Commercial | NiSource Gas Distribution
Disaggregation of Revenue [Line Items]
Customer revenues		779.5	847.9	939.6
Commercial | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues			249.0	267.4
Commercial | Corporate Segment and Other Operating Segment
Disaggregation of Revenue [Line Items]
Customer revenues		0.0	0.0	0.0
Commercial | NIPSCO Operations
Disaggregation of Revenue [Line Items]
Customer revenues		199.2
Commercial | NIPSCO Operations | NIPSCO Electric Generation
Disaggregation of Revenue [Line Items]
Customer revenues		620.4	578.1	571.0
Commercial | Columbia Operations
Disaggregation of Revenue [Line Items]
Customer revenues		580.3	598.9	672.2
Industrial | NiSource Electric Generation and Power Delivery
Disaggregation of Revenue [Line Items]
Customer revenues	499.1		474.1	560.6
Industrial | NiSource Gas Distribution
Disaggregation of Revenue [Line Items]
Customer revenues		223.2	226.0	220.6
Industrial | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues			87.0	85.1
Industrial | Corporate Segment and Other Operating Segment
Disaggregation of Revenue [Line Items]
Customer revenues		0.0	0.0	0.0
Industrial | NIPSCO Operations
Disaggregation of Revenue [Line Items]
Customer revenues		79.0
Industrial | NIPSCO Operations | NIPSCO Electric Generation
Disaggregation of Revenue [Line Items]
Customer revenues		499.1	474.1	560.6
Industrial | Columbia Operations
Disaggregation of Revenue [Line Items]
Customer revenues		144.2	139.0	135.5
Off-system | NiSource Gas Distribution
Disaggregation of Revenue [Line Items]
Customer revenues		42.6	60.6	192.9
Off-system | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues			0.0	0.0
Off-system | Corporate Segment and Other Operating Segment
Disaggregation of Revenue [Line Items]
Customer revenues		0.0	0.0	0.0
Off-system | NIPSCO Operations
Disaggregation of Revenue [Line Items]
Customer revenues		0.0
Off-system | Columbia Operations
Disaggregation of Revenue [Line Items]
Customer revenues		42.6	60.6	192.9
Miscellaneous | NiSource Electric Generation and Power Delivery
Disaggregation of Revenue [Line Items]
Customer revenues	13.7		21.4	(14.1)
Miscellaneous | NiSource Gas Distribution
Disaggregation of Revenue [Line Items]
Customer revenues		41.7	48.2	38.2
Miscellaneous | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues			14.8	10.9
Miscellaneous | Corporate Segment and Other Operating Segment
Disaggregation of Revenue [Line Items]
Customer revenues		0.0	0.0	0.0
Miscellaneous | NIPSCO Operations
Disaggregation of Revenue [Line Items]
Customer revenues		15.4
Miscellaneous | NIPSCO Operations | NIPSCO Electric Generation
Disaggregation of Revenue [Line Items]
Customer revenues		13.7	21.4	(14.1)
Miscellaneous | Columbia Operations
Disaggregation of Revenue [Line Items]
Customer revenues		26.3	33.4	27.3
Wholesale | NiSource Electric Generation and Power Delivery
Disaggregation of Revenue [Line Items]
Customer revenues	38.3		32.0	13.5
Wholesale | NiSource Gas Distribution
Disaggregation of Revenue [Line Items]
Customer revenues		1.2	1.6	2.1
Wholesale | Electric Operations
Disaggregation of Revenue [Line Items]
Customer revenues			0.0	0.0
Wholesale | Corporate Segment and Other Operating Segment
Disaggregation of Revenue [Line Items]
Customer revenues		0.0	0.0	0.0
Wholesale | NIPSCO Operations
Disaggregation of Revenue [Line Items]
Customer revenues		0.0
Wholesale | NIPSCO Operations | NIPSCO Electric Generation
Disaggregation of Revenue [Line Items]
Customer revenues		38.3	32.0	13.5
Wholesale | Columbia Operations
Disaggregation of Revenue [Line Items]
Customer revenues		1.2	1.6	2.1
Public Authority
Disaggregation of Revenue [Line Items]
Customer revenues	$ 8.1		11.5	12.1
Public Authority | NIPSCO Operations | NIPSCO Electric Generation
Disaggregation of Revenue [Line Items]
Customer revenues		$ 8.1	$ 11.5	$ 12.1

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