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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2023
Significant Segment Financial Data | The following tables provide significant segment financial data for the years ended December 31, 2023, 2022 and 2021 (millions):
Year Ended December 31, 2023 |  | Electric |  |  | Gas |  |  | Other |  |  | Total |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |
Billed and Unbilled Revenue |  | $ | 311.7 |  |  | $ | 253.8 |  |  | $ | — |  |  | $ | 565.5 |
Rate Adjustment Mechanism Revenue |  |  | (5.2 | ) |  |  | (3.2 | ) |  |  | — |  |  |  | (8.4 | )
Total Operating Revenues |  |  | 306.5 |  |  |  | 250.6 |  |  |  | — |  |  |  | 557.1 |
Interest Income |  |  | 2.6 |  |  |  | 2.4 |  |  |  | 1.2 |  |  |  | 6.2 |
Interest Expense |  |  | 11.2 |  |  |  | 20.7 |  |  |  | 3.0 |  |  |  | 34.9 |
Depreciation & Amortization Expense |  |  | 26.0 |  |  |  | 40.4 |  |  |  | 1.0 |  |  |  | 67.4 |
Income Tax Expense (Benefit) |  |  | 4.0 |  |  |  | 9.4 |  |  |  | (0.2 | ) |  |  | 13.2 |
Segment Profit (Loss) |  |  | 17.9 |  |  |  | 28.8 |  |  |  | (1.5 | ) |  |  | 45.2 |
Segment Assets |  |  | 612.6 |  |  |  | 1,031.8 |  |  |  | 26.0 |  |  |  | 1,670.4 |
Capital Expenditures |  |  | 44.2 |  |  |  | 92.7 |  |  |  | 4.1 |  |  |  | 141.0 |
Year Ended December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |
Billed and Unbilled Revenue |  | $ | 290.2 |  |  | $ | 263.3 |  |  | $ | — |  |  | $ | 553.5 |
Rate Adjustment Mechanism Revenue |  |  | 7.7 |  |  |  | 2.0 |  |  |  | — |  |  |  | 9.7 |
Total Operating Revenues |  |  | 297.9 |  |  |  | 265.3 |  |  |  | — |  |  |  | 563.2 |
Interest Income |  |  | 0.9 |  |  |  | 1.0 |  |  |  | 0.9 |  |  |  | 2.8 |
Interest Expense |  |  | 9.1 |  |  |  | 16.8 |  |  |  | 2.4 |  |  |  | 28.3 |
Depreciation & Amortization Expense |  |  | 25.4 |  |  |  | 36.3 |  |  |  | 0.9 |  |  |  | 62.6 |
Income Tax Expense (Benefit) |  |  | 3.1 |  |  |  | 8.2 |  |  |  | (0.1 | ) |  |  | 11.2 |
Segment Profit (Loss) |  |  | 15.7 |  |  |  | 26.5 |  |  |  | (0.8 | ) |  |  | 41.4 |
Segment Assets |  |  | 580.9 |  |  |  | 988.8 |  |  |  | 20.7 |  |  |  | 1,590.4 |
Capital Expenditures |  |  | 33.8 |  |  |  | 87.6 |  |  |  | 0.7 |  |  |  | 122.1 |
Year Ended December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |
Billed and Unbilled Revenue |  | $ | 248.5 |  |  | $ | 217.6 |  |  | $ | — |  |  | $ | 466.1 |
Rate Adjustment Mechanism Revenue |  |  | — |  |  |  | 7.2 |  |  |  | — |  |  |  | 7.2 |
Total Operating Revenues |  |  | 248.5 |  |  |  | 224.8 |  |  |  | — |  |  |  | 473.3 |
Interest Income |  |  | 0.8 |  |  |  | 0.5 |  |  |  | 0.3 |  |  |  | 1.6 |
Interest Expense |  |  | 9.0 |  |  |  | 15.3 |  |  |  | 2.9 |  |  |  | 27.2 |
Depreciation & Amortization Expense |  |  | 25.9 |  |  |  | 32.6 |  |  |  | 1.0 |  |  |  | 59.5 |
Income Tax Expense (Benefit) |  |  | 4.5 |  |  |  | 7.7 |  |  |  | (0.7 | ) |  |  | 11.5 |
Segment Profit |  |  | 14.0 |  |  |  | 23.2 |  |  |  | (1.1 | ) |  |  | 36.1 |
Segment Assets |  |  | 584.0 |  |  |  | 935.9 |  |  |  | 20.4 |  |  |  | 1,540.3 |
Capital Expenditures |  |  | 38.1 |  |  |  | 75.8 |  |  |  | 1.1 |  |  |  | 115.0 |

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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 350 -SubTopic 20 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482573/350-20-50-1 Reference 2: 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 3: 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 4: 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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