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Business Segment Information (Tables) | 9 Months Ended
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Sep. 30, 2024
Segment Reporting [Abstract] |
Schedule Of Operating Income Derived From Revenues And Expenses By Segment |
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) | 2024 |  | 2023 |  | 2024 |  | 2023
Operating Revenues |  |  |  |  |  |  |
Columbia Operations |  |  |  |  |  |  |
Unaffiliated | $ | 423.4 |  |  | $ | 411.0 |  |  | $ | 1,864.5 |  |  | $ | 1,981.5 |
Intersegment | 3.3 |  |  | 3.0 |  |  | 9.6 |  |  | 9.1 |
Total | 426.7 |  |  | 414.0 |  |  | 1,874.1 |  |  | 1,990.6 |
NIPSCO Operations |  |  |  |  |  |  |
Unaffiliated | 652.6 |  |  | 616.2 |  |  | 2,002.2 |  |  | 2,101.3 |
Intersegment | 0.3 |  |  | 0.4 |  |  | 0.8 |  |  | 0.8 |
Total | 652.9 |  |  | 616.6 |  |  | 2,003.0 |  |  | 2,102.1 |
Corporate and Other |  |  |  |  |  |  |
Unaffiliated | 0.3 |  |  | 0.2 |  |  | 0.6 |  |  | 0.6 |
Intersegment | 145.6 |  |  | 121.7 |  |  | 424.5 |  |  | 361.2 |
Total | 145.9 |  |  | 121.9 |  |  | 425.1 |  |  | 361.8 |
Eliminations | (149.2) |  |  | (125.1) |  |  | (434.9) |  |  | (371.1) |
Consolidated Operating Revenues | $ | 1,076.3 |  |  | $ | 1,027.4 |  |  | $ | 3,867.3 |  |  | $ | 4,083.4 |
Operating Income |  |  |  |  |  |  |
Columbia Operations | $ | 41.2 |  |  | $ | 54.6 |  |  | $ | 499.8 |  |  | $ | 507.5 |
NIPSCO Operations | 171.3 |  |  | 173.1 |  |  | 530.0 |  |  | 413.9 |
Corporate and Other | 5.8 |  |  | 5.3 |  |  | 8.9 |  |  | 11.5 |
Consolidated Operating Income | $ | 218.3 |  |  | $ | 233.0 |  |  | $ | 1,038.7 |  |  | $ | 932.9 |
The following table provides information about the assets of our reportable segments included in the Condensed Consolidated Balance Sheet (unaudited):
(in millions) | September 30, 2024 |  | December 31, 2023
Assets |  |  |
Columbia Operations | $ | 14,174.1 |  |  | $ | 13,664.5 |
NIPSCO Operations | 15,450.1 |  |  | 13,962.6 |
Corporate and Other | 1,203.9 |  |  | 3,450.1 |
Consolidated Assets | $ | 30,828.1 |  |  | $ | 31,077.2 |
Information about our reportable segments for the nine months ended September 30, 2023, as well as for the period ended December 31, 2023 has been recast to align with the current year's presentation.

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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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