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Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2025
Subsequent Events [Abstract]
Subsequent Event	Minority Equity Interest Sale On October 28, 2025, NiSource issued a 19.9% indirect equity interest in NiSource’s wholly-owned subsidiary GenCo to BIP Orion Holdco L.P. and BIP Orion Holdco II L.P., affiliates of Blackstone (collectively, “Investor”), in exchange for $35.2 million. On October 28, 2025, simultaneously with issuance of the 19.9% indirect equity interest in GenCo, Investor, Generation Holdings I, Generation Holdings II and NiSource entered into an Amended and Restated Limited Liability Company Agreement of Generation Holdings II (the “LLC Agreement”). The LLC Agreement establishes, among other things, governance rights, exit rights, requirements for additional capital contributions, mechanics for distributions, and other arrangements for Generation Holdings II. Specifically, under the terms of the LLC Agreement, Investor will provide up to $1.325 billion in additional capital contributions over a seven-year period, which obligation is backed by an Equity Commitment Letter from Blackstone or an affiliate thereof. Under the LLC Agreement, Investor is entitled to appoint two directors to the board of directors of Generation Holdings II (the “Board”) so long as Investor (together with any approved affiliate) holds at least a 17.5% Percentage Interest (as defined in the LLC Agreement). Investor is expected to appoint two directors to the Board, such that the Board will be comprised of seven directors, two appointed by Investor and five appointed by NiSource. The LLC Agreement also contains certain investor protections, including, among other things, requiring Investor approval for Generation Holdings II to take certain major actions. In addition, the LLC Agreement contains certain terms surrounding transfer rights and other obligations applicable to both Investor and NiSource. Under the LLC Agreement, Generation Holdings II has agreed that, so long as Investor holds a 14.9% or greater Percentage Interest in Generation Holdings II, Generation Holdings II, NIPSCO Holdings II (as defined below) and/or their respective subsidiaries will be the exclusive vehicles for all power, storage and generation requirements for data center customers within NIPSCO’s service territory. On October 28, 2025, the members of NIPSCO Holdings II entered into a Third Amended and Restated Limited Liability Company Agreement of NIPSCO Holdings II (the "Amended LLC Agreement"), which, among other changes, increased the amount and time period for additional mandatory capital contributions required to be contributed by Investor by $175 million and seven years, which obligation is backed by an Equity Commitment Letter from Blackstone or an affiliate thereof, and amended certain provisions to facilitate NIPSCO Holdings II and its subsidiaries’ provision of electric service to data center customers (and related activities) and their related contracts and arrangements with Generation Holdings II and its subsidiaries.