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Long-Term Debt (Narrative) (Details) - NiSource - USD ($) $ in Millions | Jun. 07, 2022 | Jun. 30, 2022 | Apr. 01, 2022
--- | --- | --- | ---
Medium-term Notes |  |  |
Debt Instrument [Line Items] |  |  |
Medium-term Notes, Current |  |  | $ 20.0
Debt, Weighted Average Interest Rate |  |  | 7.99%
Medium-term Notes, Noncurrent |  | $ 29.0 |
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt, Weighted Average Interest Rate | 5.00% |  |
Senior Notes | $ 350.0 |  |
Proceeds from Debt, Net of Issuance Costs | $ 344.6 |  |

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