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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues | $ 5,282.9 | $ 5,282.9 | $ 5,347.8 | $ 5,738.6
Other revenues | 172.2 | 172.2 | 157.6 | 112.0
Total Operating Revenues | 5,455.1 | 5,455.1 | 5,505.4 | 5,850.6
NiSource Electric Generation and Power Delivery |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues | 1,829.5 |  | 1,701.0 | 1,735.5
NiSource Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 3,453.4 | 3,646.8 | 4,003.1
Electric Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Operating Revenues |  |  | 2,770.7 | 2,886.2
Corporate Segment and Other Operating Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 0.0 | 0.0 | 0.0
Other revenues |  | 0.9 | 0.8 | 12.5
Total Operating Revenues |  | 0.9 | 0.8 | 12.5
NIPSCO Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 2,654.5 | 2,686.8 | 2,790.4
Other revenues |  | 96.5 | 83.9 | 95.8
Total Operating Revenues | 2,751.0 |  |  |
NIPSCO Operations | NIPSCO Electric Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 1,829.5 | 1,701.0 | 1,735.5
NIPSCO Operations | NIPSCO Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 825.0 | 985.8 | 1,054.9
Columbia Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 2,628.4 | 2,661.0 | 2,948.2
Other revenues |  | 74.8 | 72.9 | 3.7
Total Operating Revenues |  | 2,703.2 | 2,733.9 | 2,951.9
Residential | NiSource Electric Generation and Power Delivery |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues | 649.9 |  | 583.9 | 592.4
Residential | NiSource Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 2,365.2 | 2,462.5 | 2,609.7
Residential | Electric Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  |  | 635.0 | 691.5
Residential | Corporate Segment and Other Operating Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 0.0 | 0.0 | 0.0
Residential | NIPSCO Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 531.4 |  |
Residential | NIPSCO Operations | NIPSCO Electric Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 649.9 | 583.9 | 592.4
Residential | Columbia Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 1,833.8 | 1,827.5 | 1,918.2
Commercial | NiSource Electric Generation and Power Delivery |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues | 620.4 |  | 578.1 | 571.0
Commercial | NiSource Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 779.5 | 847.9 | 939.6
Commercial | Electric Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  |  | 249.0 | 267.4
Commercial | Corporate Segment and Other Operating Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 0.0 | 0.0 | 0.0
Commercial | NIPSCO Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 199.2 |  |
Commercial | NIPSCO Operations | NIPSCO Electric Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 620.4 | 578.1 | 571.0
Commercial | Columbia Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 580.3 | 598.9 | 672.2
Industrial | NiSource Electric Generation and Power Delivery |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues | 499.1 |  | 474.1 | 560.6
Industrial | NiSource Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 223.2 | 226.0 | 220.6
Industrial | Electric Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  |  | 87.0 | 85.1
Industrial | Corporate Segment and Other Operating Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 0.0 | 0.0 | 0.0
Industrial | NIPSCO Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 79.0 |  |
Industrial | NIPSCO Operations | NIPSCO Electric Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 499.1 | 474.1 | 560.6
Industrial | Columbia Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 144.2 | 139.0 | 135.5
Off-system | NiSource Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 42.6 | 60.6 | 192.9
Off-system | Electric Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  |  | 0.0 | 0.0
Off-system | Corporate Segment and Other Operating Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 0.0 | 0.0 | 0.0
Off-system | NIPSCO Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 0.0 |  |
Off-system | Columbia Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 42.6 | 60.6 | 192.9
Miscellaneous | NiSource Electric Generation and Power Delivery |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues | 13.7 |  | 21.4 | (14.1)
Miscellaneous | NiSource Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 41.7 | 48.2 | 38.2
Miscellaneous | Electric Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  |  | 14.8 | 10.9
Miscellaneous | Corporate Segment and Other Operating Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 0.0 | 0.0 | 0.0
Miscellaneous | NIPSCO Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 15.4 |  |
Miscellaneous | NIPSCO Operations | NIPSCO Electric Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 13.7 | 21.4 | (14.1)
Miscellaneous | Columbia Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 26.3 | 33.4 | 27.3
Wholesale | NiSource Electric Generation and Power Delivery |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues | 38.3 |  | 32.0 | 13.5
Wholesale | NiSource Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 1.2 | 1.6 | 2.1
Wholesale | Electric Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  |  | 0.0 | 0.0
Wholesale | Corporate Segment and Other Operating Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 0.0 | 0.0 | 0.0
Wholesale | NIPSCO Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 0.0 |  |
Wholesale | NIPSCO Operations | NIPSCO Electric Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 38.3 | 32.0 | 13.5
Wholesale | Columbia Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | 1.2 | 1.6 | 2.1
Public Authority |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues | $ 8.1 |  | 11.5 | 12.1
Public Authority | NIPSCO Operations | NIPSCO Electric Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenues |  | $ 8.1 | $ 11.5 | $ 12.1

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