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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract] |
Gas And Electric Supply Contractual Obligations | The following table lists the Company’s known specified gas and electric supply contractual obligations as of December 31, 2023.
|  |  |  |  | Payments Due by Period |
Gas and Electric Supply Contractual Obligations (millions) as of December 31, 2023 |  | Total |  |  | 2024 |  |  | 2025 |  |  | 2026 |  |  | 2027 |  |  | 2028 |  |  | 2029 & Beyond |
Gas Supply Contracts |  | $ | 479.2 |  |  | $ | 79.9 |  |  | $ | 45.7 |  |  | $ | 44.3 |  |  | $ | 43.8 |  |  | $ | 39.1 |  |  | $ | 226.4 |
Electric Supply Contracts |  |  | 12.1 |  |  |  | 1.3 |  |  |  | 1.3 |  |  |  | 1.3 |  |  |  | 1.3 |  |  |  | 1.1 |  |  |  | 5.8 |
Total |  | $ | 491.3 |  |  | $ | 81.2 |  |  | $ | 47.0 |  |  | $ | 45.6 |  |  | $ | 45.1 |  |  | $ | 40.2 |  |  | $ | 232.2 |
Environmental Obligations Recognized by Company | The following table sets forth a summary of changes in the Company’s liability for Environmental Obligations for the years-ended December 31, 2023 and 2022.
|  | December 31, |
Environmental Obligations (millions) |  | 2023 |  |  | 2022 |
Total Balance at Beginning of Period |  | $ | 4.4 |  |  | $ | 2.7 |
Additions |  |  | 0.7 |  |  |  | 2.0 |
Less: Payments / Reductions |  |  | 0.5 |  |  |  | 0.3 |
Total Balance at End of Period |  |  | 4.6 |  |  |  | 4.4 |
Less: Current Portion |  |  | 0.6 |  |  |  | 0.6 |
Noncurrent Balance at End of Period |  | $ | 4.0 |  |  | $ | 3.8 |

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- Definition Tabular disclosure of contractual obligation by timing of payment due. Includes, but is not limited to, long-term debt obligation, lease obligation, and purchase obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (S-X 210.12-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3 + Details
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- Definition Tabular disclosure of environmental loss contingencies by individual site. Does not include loss contingencies that are not environmental in nature. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480102/450-20-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480102/450-20-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 + Details
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