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Long-Term Debt (Narrative) (Details) $ in Millions	Jun. 08, 2023 USD ($)	Mar. 24, 2023 USD ($)	Sep. 30, 2023 USD ($) MW
NiSource
Debt Instrument [Line Items]
Senior Notes	$ 450.0
Rosewater
Debt Instrument [Line Items]
Nameplate Capacity | MW			102
Senior Notes | NiSource
Debt Instrument [Line Items]
Senior Notes	$ 300.0	$ 750.0	$ 1,050.0
Debt, Weighted Average Interest Rate	5.25%	5.25%
Proceeds from Debt, Net of Issuance Costs	$ 742.5	$ 742.2
Unsecured Debt | NiSource
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.40%

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