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Variable Interest Entities (Narrative) (Details) $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 17, 2023 USD ($) Rate | Aug. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2023 MW | Dec. 31, 2023 Rate | Dec. 31, 2023
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Wind Power Purchase Agreement, Purchase Percentage | Rate |  |  |  |  |  |  | 100.00% |
Milestone and final payments to renewable generation asset developer |  |  | $ 761.4 | $ 323.9 | $ 240.4 |  |  |
Obligation to the Developer |  |  | 0.0 | 0.0 | 277.5 |  |  |
Income Taxes |  |  | 139.5 | 164.6 | $ 117.8 |  |  |
Payments to Acquire Assets, Investing Activities |  | $ 307.2 |  |  |  |  |  |
Payments to Acquire Interest in Subsidiaries and Affiliates |  |  | 389.2 |  |  |  |  |
Business Combination, Price of Acquisition, Expected | $ 2,150.0 |  |  |  |  |  |  |
Business Acquisition, Transaction Costs |  |  | 54.7 |  |  |  |  |
Proceeds from Contributed Capital |  |  | 2,160.0 |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Other, Carrying Amount |  |  | 1,360.0 |  |  |  |  |
Other Current Liabilities |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Other Accrued Liabilities |  |  | 47.6 |  |  |  |  |
NIPSCO Holdings II |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Parent | Rate | 19.90% |  |  |  |  |  |  |
NiSource |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Parent |  |  |  |  |  |  | 80.10% | 80.10%
Rosewater |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Nameplate Capacity | MW |  |  |  |  |  | 102 |  |
Indiana Crossroads Wind |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Nameplate Capacity | MW |  |  |  |  |  | 302 |  |
Indiana Crossroads Solar |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Nameplate Capacity | MW |  |  |  |  |  | 465 |  |
Dunns Bridge I |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Nameplate Capacity | MW |  |  |  |  |  | 465 |  |
Consolidated Variable Interest Entities |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Obligation to the Developer |  |  |  | 347.2 |  |  |  |
Interest paid to developer |  |  |  | $ 42.0 |  |  |  |
Income Taxes |  |  | 63.5 |  |  |  |  |
NIPSCO's Cash Contribution |  |  | $ 401.5 |  |  |  |  |

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