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Risk Management Activities (Narrative) (Details) mMDth in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) mMDth | Dec. 31, 2023 USD ($) mMDth | Jun. 08, 2023 USD ($) | Mar. 24, 2023 USD ($)
Derivative [Line Items] |  |  |  |
Limit of GCA Volumes | 20.00% |  |  |
Derivative Asset | $ 27.0 | $ 23.3 |  |
Senior Notes | 12,103.0 | 10,853.0 |  |
Derivative Asset, Subject to Master Netting Arrangement, after Offset | $ 23.5 | 13.9 |  |
Customer annual demand | 20.00% |  |  |
Other Current Assets |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset | $ 9.1 | $ 1.1 |  |
NiSource |  |  |  |
Derivative [Line Items] |  |  |  |
Senior Notes |  |  | $ 450.0 |
Senior Notes | NiSource |  |  |  |
Derivative [Line Items] |  |  |  |
Senior Notes | $ 1,050.0 |  | $ 300.0 | $ 750.0
Debt, Weighted Average Interest Rate |  |  | 5.25% | 5.25%
Minimum |  |  |  |
Derivative [Line Items] |  |  |  |
Commodity Contract Length | 1 year |  |  |
Maximum |  |  |  |
Derivative [Line Items] |  |  |  |
Commodity Contract Length | 3 years |  |  |
Natural Gas |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Nonmonetary Notional Amount | mMDth | 77.8 | 76.1 |  |

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