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Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions				12 Months Ended
	Jun. 08, 2023	Mar. 24, 2023	Jun. 07, 2022	Dec. 31, 2023	Dec. 31, 2022	Aug. 30, 2022	Apr. 01, 2022
Debt Instrument [Line Items]
Senior Notes				$ 10,853.0	$ 9,353.0
Interest rate on debt				6.41%	5.37%
Debt Instrument, Convertible, Conversion Ratio				58.20%
Security interest and other subset of asset				$ 200.0
Asset sale covenant percentage of consolidated total assets				15.00%
Cross default provision on default relating to any indebtedness				$ 75.0
Percentage of additional subset of assets capped				10.00%
Revolving credit percentage requirement in NIPSCO				70.00%
NiSource
Debt Instrument [Line Items]
Senior Notes	$ 450.0
NiSource | Senior Notes
Debt Instrument [Line Items]
Senior Notes	$ 300.0	$ 750.0	$ 350.0	$ 1,050.0
Debt, Weighted Average Interest Rate	5.25%	5.25%	5.00%
Proceeds from Debt, Net of Issuance Costs	$ 742.5	$ 742.2	$ 344.6
NiSource | Medium-term Notes
Debt Instrument [Line Items]
Medium-term Notes, Current						$ 10.0	$ 20.0
Debt, Weighted Average Interest Rate				7.99%		7.40%	7.99%
NiSource | Unsecured Debt
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.40%
NIPSCO | Medium-term Notes
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate				7.64%
Columbia Of Massachusetts | Medium-term Notes
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate				6.37%
Maximum
Debt Instrument [Line Items]
Cross default provision on default relating to any indebtedness				$ 50.0
Minimum
Debt Instrument [Line Items]
Cross default provision on default relating to any indebtedness				$ 5.0
Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Debt Instrument, Convertible, Conversion Ratio				70.00%

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