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Business Segment Information | 9 Months Ended
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Sep. 30, 2024
Segment Reporting Information, Additional Information [Abstract] |
Business Segment Information | (12) Business Segme nt Information We conduct our business operations through two operating segments: Electric Utilities and Gas Utilities. Certain unallocated corporate expenses that support our operating segments are presented as Corporate and Other. Corporate and Other also includes business development activities that are not part of our operating segments and inter-segment eliminations. Our operating segments are equivalent to our reportable segments. Our Chief Executive Officer, who is considered to be our CODM, reviews financial information presented on an operating segment basis for purposes of making decisions, allocating resources, and assessing financial performance. Our CODM assesses the performance of our operating segments based on operating income. Our CODM reviews capital expenditures by operating segment rather than any individual or total asset amount. Segment information was as follows:
| Electric Utilities |  | Gas Utilities |  | Corporate and Other |  | Total |
| (in millions) |
Three Months Ended September 30, 2024 |  |  |  |  |  |  |  |
External revenues | $ | 229.6 |  | $ | 172.0 |  | $ | - |  | $ | 401.6 |
Inter-segment revenues |  | 2.9 |  |  | 1.6 |  |  | (4.5 | ) |  | - |
Operating income |  | 65.1 |  |  | 10.9 |  |  | (0.2 | ) |  | 75.8 |
Capital expenditures (a) |  | 61.2 |  |  | 117.8 |  |  | 6.0 |  |  | 185.0 |
Three Months Ended September 30, 2023 |  |  |  |  |  |  |  |
External revenues | $ | 234.5 |  | $ | 172.6 |  | $ | - |  | $ | 407.1 |
Inter-segment revenues |  | 2.8 |  |  | 1.7 |  |  | (4.5 | ) |  | - |
Operating income |  | 83.0 |  |  | 15.4 |  |  | (0.6 | ) |  | 97.8 |
Capital expenditures (a) |  | 55.7 |  |  | 108.1 |  |  | 1.3 |  |  | 165.1 |
Nine Months Ended September 30, 2024 |  |  |  |  |  |  |  |
External revenues | $ | 651.0 |  | $ | 879.6 |  | $ | - |  | $ | 1,530.6 |
Inter-segment revenues |  | 8.8 |  |  | 4.6 |  |  | (13.4 | ) |  | - |
Operating income |  | 176.0 |  |  | 164.6 |  |  | (0.8 | ) |  | 339.8 |
Capital expenditures (a) |  | 246.8 |  |  | 308.2 |  |  | 10.8 |  |  | 565.8 |
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |  |
External revenues | $ | 640.6 |  | $ | 1,099.0 |  | $ | - |  | $ | 1,739.6 |
Inter-segment revenues |  | 8.5 |  |  | 4.9 |  |  | (13.4 | ) |  | - |
Operating income |  | 190.7 |  |  | 147.7 |  |  | (2.2 | ) |  | 336.2 |
Capital expenditures (a) |  | 155.6 |  |  | 260.9 |  |  | 4.1 |  |  | 420.6 |
(a) Includes accruals for property, plant, and equipment as disclosed in supplemental cash flow information in the Consolidated Statements of Cash Flows in the Consolidated Financial Statements.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 48 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-48 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards 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