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Business Segment Information (Tables) | 9 Months Ended
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Sep. 30, 2025
Segment Reporting [Abstract] |
Schedule Of Operating Income Derived From Revenues And Expenses By Segment |
Three Months Ended September 30, 2025 |  |
(in millions) | Columbia Operations |  | NIPSCO Operations |  | Total of Reportable Segments |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |
External Revenue | $ | 484.9 |  |  | $ | 787.0 |  |  | $ | 1,271.9 |  |  |  |  |
Intersegment Revenue | 3.3 |  |  | 0.3 |  |  | 3.6 |  |  |  |  |
Total Operating Revenue | $ | 488.2 |  |  | $ | 787.3 |  |  | $ | 1,275.5 |  |  |  |  |
Cost of energy | 58.5 |  |  | 135.2 |  |  | 193.7 |  |  |  |  |
O&M | 212.8 |  |  | 215.1 |  |  | 427.9 |  |  |  |  |
Depreciation | 112.7 |  |  | 185.3 |  |  | 298.0 |  |  |  |  |
Total other taxes | 52.0 |  | 19.1 |  | 71.1 |  |  |  |  |
Other segment items(1) | 0.1 |  |  | — |  |  | 0.1 |  |  |  |  |
Operating Income | $ | 52.1 |  |  | $ | 232.6 |  |  | $ | 284.7 |  |  |  |  |
(1)Other segment items consists of Loss on Sale or Impairment of Assets and other segment income or expenses deemed insignificant which are used to reach our measurement of segment profit or loss, Operating Income.
Three Months Ended September 30, 2024 |  |
(in millions) | Columbia Operations |  | NIPSCO Operations |  | Total of Reportable Segments |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |
External Revenue | $ | 423.4 |  |  | $ | 652.6 |  |  | $ | 1,076.0 |  |  |  |  |
Intersegment Revenue | 3.3 |  |  | 0.3 |  |  | 3.6 |  |  |  |  |
Total Operating Revenue | 426.7 |  |  | 652.9 |  |  | 1,079.6 |  |  |  |  |
Cost of energy | 34.2 |  |  | 131.7 |  |  | 165.9 |  |  |  |  |
O&M | 202.9 |  |  | 177.7 |  |  | 380.6 |  |  |  |  |
Depreciation | 103.0 |  |  | 156.8 |  |  | 259.8 |  |  |  |  |
Total other taxes | 45.4 |  | 15.4 |  | 60.8 |  |  |  |
Operating Income | $ | 41.2 |  |  | $ | 171.3 |  |  | $ | 212.5 |  |  |  |  |
Nine Months Ended September 30, 2025 |  |
(in millions) | Columbia Operations |  | NIPSCO Operations |  | Total of Reportable Segments |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |
External Revenue | $ | 2,326.7 |  |  | $ | 2,409.0 |  |  | $ | 4,735.7 |  |  |  |  |
Intersegment Revenue | 10.0 |  |  | 0.8 |  |  | 10.8 |  |  |  |  |
Total Operating Revenue | $ | 2,336.7 |  |  | $ | 2,409.8 |  |  | $ | 4,746.5 |  |  |  |  |
Cost of energy | 548.7 |  |  | 554.3 |  |  | 1,103.0 |  |  |  |  |
O&M | 663.5 |  |  | 628.1 |  |  | 1,291.6 |  |  |  |  |
Depreciation | 332.6 |  |  | 492.5 |  |  | 825.1 |  |  |  |  |
Total other taxes | 171.4 |  | 55.7 |  | 227.1 |  |  |  |  |
Other segment items(1) | 0.4 |  |  | 0.7 |  |  | 1.1 |  |  |  |  |
Operating Income | $ | 620.1 |  |  | $ | 678.5 |  |  | $ | 1,298.6 |  |  |  |  |
(1)Other segment items consists of Loss on Sale or Impairment of Assets and other segment income or expenses deemed insignificant which are used to reach our measurement of segment profit or loss, Operating Income.
Nine Months Ended September 30, 2024 |  |
(in millions) | Columbia Operations |  | NIPSCO Operations |  | Total of Reportable Segments |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |
External Revenue | $ | 1,864.5 |  |  | $ | 2,002.2 |  |  | $ | 3,866.7 |  |  |  |  |
Intersegment Revenue | 9.6 |  |  | 0.8 |  |  | 10.4 |  |  |  |  |
Total Operating Revenue | 1,874.1 |  |  | 2,003.0 |  |  | 3,877.1 |  |  |  |  |
Cost of energy | 319.3 |  |  | 436.3 |  |  | 755.6 |  |  |  |  |
O&M | 604.9 |  |  | 556.5 |  |  | 1,161.4 |  |  |  |  |
Depreciation | 300.6 |  |  | 432.5 |  |  | 733.1 |  |  |  |  |
Total other taxes | 149.5 |  | 47.8 |  | 197.3 |  |  |  |
Other segment items(1) | — |  |  | (0.1) |  |  | (0.1) |  |  |  |  |
Operating Income | $ | 499.8 |  |  | $ | 530.0 |  |  | $ | 1,029.8 |  |  |  |  |
(1)Other segment items consists of (Gain) on Sale or Impairment of Assets and other segment income or expenses deemed insignificant which are used to reach our measurement of segment profit or loss, Operating Income. The following table provides information about the assets of our reportable segments included in the Condensed Consolidated Balance Sheets (unaudited):
(in millions) | September 30, 2025 |  | December 31, 2024
Assets |  |  |
Columbia Operations | $ | 15,267.9 |  |  | $ | 14,769.5 |
NIPSCO Operations | 17,834.8 |  |  | 15,823.5 |
Corporate and Other | 1,300.2 |  |  | 1,195.1 |
Consolidated Assets | $ | 34,402.9 |  |  | $ | 31,788.1 |
To reconcile the segment tables above to consolidated NiSource:
Three Months Ended September 30, 2025
(in millions) | Total Reportable Segments |  | Corporate and Other |  | Eliminations |  | Consolidated NiSource
Total Operating Revenue | $ | 1,275.5 |  |  | $ | 151.8 |  |  | $ | (154.2) |  |  | $ | 1,273.1 |
Operating Income | 284.7 |  |  | 12.8 |  |  | — |  |  | 297.5 |
Three Months Ended September 30, 2024
(in millions) | Total Reportable Segments |  | Corporate and Other |  | Eliminations |  | Consolidated NiSource
Total Operating Revenue | $ | 1,079.6 |  |  | $ | 145.9 |  |  | $ | (149.2) |  |  | $ | 1,076.3 |
Operating Income | 212.5 |  |  | 5.8 |  |  | — |  |  | 218.3 |
Nine Months Ended September 30, 2025
(in millions) | Total Reportable Segments |  | Corporate and Other |  | Eliminations |  | Consolidated NiSource
Total Operating Revenue | $ | 4,746.5 |  |  | $ | 441.8 |  |  | $ | (449.0) |  |  | $ | 4,739.3 |
Operating Income | 1,298.6 |  |  | 21.2 |  |  | — |  |  | 1,319.8 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details
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