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Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
	Jun. 07, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Aug. 30, 2022	Apr. 01, 2022
Debt Instrument [Line Items]
Senior Notes		$ 9,353.0	$ 9,003.0
Interest rate on debt		5.37%
Loss on early extinguishment of long-term debt		$ 0.0	$ 0.0	$ (243.5)
Debt Instrument, Convertible, Conversion Ratio		58.90%
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%
NiSource | Senior Notes
Debt Instrument [Line Items]
Senior Notes	$ 350.0
Debt, Weighted Average Interest Rate	5.00%
Proceeds from Debt, Net of Issuance Costs	$ 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%
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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