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Long-Term Debt (Narrative) (Details) $ in Millions	Sep. 09, 2024 USD ($)	Jun. 24, 2024 USD ($)	May 16, 2024 USD ($)	Mar. 14, 2024 USD ($)	Sep. 30, 2024 MW	Dec. 31, 2023
Debt Instrument [Line Items]
Second TCA Debt Interest Rate						6.50%
Rosewater
Debt Instrument [Line Items]
Nameplate Capacity | MW					102
Senior Notes | NiSource
Debt Instrument [Line Items]
Senior Notes		$ 600.0		$ 650.0
Debt, Weighted Average Interest Rate		5.20%		5.35%
Proceeds from Debt, Net of Issuance Costs		$ 593.7		$ 642.6
Junior Notes | NiSource
Debt Instrument [Line Items]
Senior Notes	$ 500.0		$ 500.0
Debt, Weighted Average Interest Rate	6.375%		6.95%
Proceeds from Debt, Net of Issuance Costs	$ 493.6		$ 493.4
Second TCA Debt Interest Rate	2.527%		2.451%

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