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Long-Term Debt (Narrative) (Details) $ in Millions	Mar. 27, 2025 USD ($)	Mar. 31, 2025 MW
Rosewater
Debt Instrument [Line Items]
Nameplate Capacity | MW		102
Senior Notes | NiSource
Debt Instrument [Line Items]
Senior Notes	$ 750.0
Debt, Weighted Average Interest Rate	5.85%
Proceeds from Debt, Net of Issuance Costs	$ 739.6

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