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Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 07, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Aug. 30, 2022 | Apr. 01, 2022
Debt Instrument [Line Items] |  |  |  |  |  |
Senior Notes |  | $ 9,353.0 | $ 9,003.0 |  |  |
Interest rate on debt |  | 5.37% |  |  |  |
Loss on early extinguishment of long-term debt |  | $ 0.0 | $ 0.0 | $ (243.5) |  |
Debt Instrument, Convertible, Conversion Ratio |  | 58.90% |  |  |  |
Security interest and other subset of asset |  | $ 200.0 |  |  |  |
Asset sale covenant percentage of consolidated total assets |  | 15.00% |  |  |  |
Cross default provision on default relating to any indebtedness |  | $ 75.0 |  |  |  |
Percentage of additional subset of assets capped |  | 10.00% |  |  |  |
NiSource | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior Notes | $ 350.0 |  |  |  |  |
Debt, Weighted Average Interest Rate | 5.00% |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs | $ 344.6 |  |  |  |  |
NiSource | Medium-term Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Medium-term Notes, Current |  |  |  |  | $ 10.0 | $ 20.0
Debt, Weighted Average Interest Rate |  | 7.99% |  |  | 7.40% | 7.99%
NIPSCO | Medium-term Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  | 7.64% |  |  |  |
Columbia Of Massachusetts | Medium-term Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  | 6.37% |  |  |  |
Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Cross default provision on default relating to any indebtedness |  | $ 50.0 |  |  |  |
Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Cross default provision on default relating to any indebtedness |  | $ 5.0 |  |  |  |
Revolving Credit Facility | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  | 70.00% |  |  |  |

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