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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 12, 2025 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | $ 1,246,500,000 | $ 1,054,100,000 | $ 3,396,000,000 | $ 2,697,100,000
Other revenues |  | 36,500,000 | 30,600,000 | 70,200,000 | 93,900,000
Total Operating Revenues |  | 1,283,000,000 | 1,084,700,000 | 3,466,200,000 | 2,791,000,000
NiSource Gas Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 777,900,000 | 605,300,000 | 2,448,400,000 | 1,834,100,000
NiSource Electric Generation and Power Delivery |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 468,600,000 | 448,800,000 | 947,600,000 | 863,000,000.0
Corporate and Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues | $ 2,518,393 | 0 | 0 | 0 | 0
Other revenues |  | 1,200,000 | 100,000 | 2,400,000 | 300,000
Corporate and Other | Unaffiliated |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,200,000 | 100,000 | 2,400,000 | 300,000
NIPSCO Operations |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 654,200,000 | 576,800,000 | 1,563,800,000 | 1,309,500,000
Other revenues |  | 26,400,000 | 20,400,000 | 58,200,000 | 40,100,000
Total Operating Revenues |  | 680,600,000 | 597,200,000 |  |
NIPSCO Operations | Gas Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 185,600,000 | 128,000,000.0 | 616,200,000 | 446,500,000
NIPSCO Operations | NIPSCO Electric Generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 468,600,000 | 448,800,000 | 947,600,000 | 863,000,000.0
NIPSCO Operations | Unaffiliated |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  |  |  | 1,622,000,000 | 1,349,600,000
Columbia Operations |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 592,300,000 | 477,300,000 | 1,832,200,000 | 1,387,600,000
Other revenues |  | 8,900,000 | 10,100,000 | 9,600,000 | 53,500,000
Columbia Operations | Unaffiliated |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  |  |  | 1,841,800,000 | 1,441,100,000
Residential | NiSource Gas Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 511,200,000 | 410,900,000 | 1,653,800,000 | 1,251,000,000
Residential | NiSource Electric Generation and Power Delivery |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 163,900,000 | 156,900,000 | 331,800,000 | 300,700,000
Residential | Corporate and Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 0 | 0 | 0 | 0
Residential | NIPSCO Operations | Gas Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 114,200,000 | 78,600,000 | 405,600,000 | 290,700,000
Residential | NIPSCO Operations | NIPSCO Electric Generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 163,900,000 | 156,900,000 | 331,800,000 | 300,700,000
Residential | Columbia Operations |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 397,000,000.0 | 332,300,000 | 1,248,200,000 | 960,300,000
Commercial | NiSource Gas Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 171,700,000 | 127,600,000 | 581,300,000 | 422,700,000
Commercial | NiSource Electric Generation and Power Delivery |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 161,000,000.0 | 154,400,000 | 321,100,000 | 297,300,000
Commercial | Corporate and Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 0 | 0 | 0 | 0
Commercial | NIPSCO Operations | Gas Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 45,500,000 | 30,700,000 | 148,600,000 | 105,400,000
Commercial | NIPSCO Operations | NIPSCO Electric Generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 161,000,000.0 | 154,400,000 | 321,100,000 | 297,300,000
Commercial | Columbia Operations |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 126,200,000 | 96,900,000 | 432,700,000 | 317,300,000
Industrial | NiSource Gas Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 60,200,000 | 49,100,000 | 139,500,000 | 113,000,000.0
Industrial | NiSource Electric Generation and Power Delivery |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 133,500,000 | 119,700,000 | 276,100,000 | 235,600,000
Industrial | Corporate and Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 0 | 0 | 0 | 0
Industrial | NIPSCO Operations | Gas Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 22,600,000 | 16,100,000 | 54,000,000.0 | 39,900,000
Industrial | NIPSCO Operations | NIPSCO Electric Generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 133,500,000 | 119,700,000 | 276,100,000 | 235,600,000
Industrial | Columbia Operations |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 37,600,000 | 33,000,000.0 | 85,500,000 | 73,100,000
Off-system | NiSource Gas Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 22,800,000 | 10,600,000 | 45,100,000 | 23,400,000
Off-system | Corporate and Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 0 | 0 | 0 | 0
Off-system | NIPSCO Operations | Gas Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 0 | 0 | 0 | 0
Off-system | Columbia Operations |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 22,800,000 | 10,600,000 | 45,100,000 | 23,400,000
Miscellaneous | NiSource Gas Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 12,000,000.0 | 6,900,000 | 28,700,000 | 23,000,000.0
Miscellaneous | NiSource Electric Generation and Power Delivery |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | (1,700,000) | 4,700,000 | (900,000) | 7,900,000
Miscellaneous | Corporate and Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 0 | 0 | 0 | 0
Miscellaneous | NIPSCO Operations | Gas Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 3,300,000 | 2,600,000 | 8,000,000.0 | 10,500,000
Miscellaneous | NIPSCO Operations | NIPSCO Electric Generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | (1,700,000) | 4,700,000 | (900,000) | 7,900,000
Miscellaneous | Columbia Operations |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 8,700,000 | 4,300,000 | 20,700,000 | 12,500,000
Wholesale | NiSource Gas Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  |  | 200,000 |  | 1,000,000.0
Wholesale | NiSource Electric Generation and Power Delivery |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | 11,900,000 | 11,200,000 | 19,500,000 | 17,500,000
Wholesale | Corporate and Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  |  | 0 |  | 0
Wholesale | NIPSCO Operations | Gas Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  |  | 0 |  | 0
Wholesale | NIPSCO Operations | NIPSCO Electric Generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  | $ 11,900,000 | 11,200,000 | $ 19,500,000 | 17,500,000
Wholesale | Columbia Operations |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  |  | 200,000 |  | 1,000,000.0
Public Authority |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  |  | 1,900,000 |  | 4,000,000.0
Public Authority | NIPSCO Operations | NIPSCO Electric Generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer revenues |  |  | $ 1,900,000 |  | $ 4,000,000.0

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