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Long-Term Debt (Narrative) (Details) - Medium-term Notes - NiSource - USD ($) $ in Millions | Apr. 01, 2022 | Mar. 31, 2022
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Debt Instrument [Line Items] |  |
Medium-term Notes, Current | $ 20.0 |
Debt, Weighted Average Interest Rate | 7.99% |
Medium-term Notes, Noncurrent |  | $ 29.0

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