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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2024
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, 2024.
|  |  |  |  | Payments Due by Period |
Gas and Electric Supply Contractual Obligations (millions) as of December 31, 2024 |  | Total |  |  | 2025 |  |  | 2026 |  |  | 2027 |  |  | 2028 |  |  | 2029 |  |  | 2030 & Beyond |
Gas Supply Contracts |  | $ | 742.4 |  |  | $ | 82.2 |  |  | $ | 71.9 |  |  | $ | 70.1 |  |  | $ | 65.2 |  |  | $ | 58.9 |  |  | $ | 394.1 |
Electric Supply Contracts |  |  | 11.5 |  |  |  | 1.4 |  |  |  | 1.4 |  |  |  | 1.4 |  |  |  | 1.3 |  |  |  | 1.0 |  |  |  | 5.0 |
Total |  | $ | 753.9 |  |  | $ | 83.6 |  |  | $ | 73.3 |  |  | $ | 71.5 |  |  | $ | 66.5 |  |  | $ | 59.9 |  |  | $ | 399.1 |
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, 2024 and 2023.
|  | December 31, |
Environmental Obligations (millions) |  | 2024 |  |  | 2023 |
Total Balance at Beginning of Period |  | $ | 4.6 |  |  | $ | 4.4 |
Additions |  |  | 3.6 |  |  |  | 0.7 |
Less: Payments / Reductions |  |  | 0.4 |  |  |  | 0.5 |
Total Balance at End of Period |  |  | 7.8 |  |  |  | 4.6 |
Less: Current Portion |  |  | 0.7 |  |  |  | 0.6 |
Noncurrent Balance at End of Period |  | $ | 7.1 |  |  | $ | 4.0 |

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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 -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 04 -Subparagraph (a) -Publisher SEC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -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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