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Long-Term Debt (Narrative) (Details) $ in Millions	Jun. 24, 2024 USD ($)	May 16, 2024 USD ($)	Mar. 14, 2024 USD ($)	Jun. 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
Debt, Weighted Average Interest Rate		6.95%
Proceeds from Debt, Net of Issuance Costs		$ 493.4
Second TCA Debt Interest Rate		2.45%

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