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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2021.
|  |  |  |  | Payments Due by Period |
Gas and Electric Supply Contractual Obligations (millions) as of December 31, 2021 |  | Total |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | 2025 |  |  | 2026 |  |  | 2027 & Beyond |
Gas Supply Contracts |  | $ | 523.9 |  |  | $ | 58.5 |  |  | $ | 50.6 |  |  | $ | 38.8 |  |  | $ | 37.3 |  |  | $ | 36.9 |  |  | $ | 301.8 |
Electric Supply Contracts |  |  | 14.2 |  |  |  | 1.2 |  |  |  | 1.2 |  |  |  | 1.2 |  |  |  | 1.3 |  |  |  | 1.3 |  |  |  | 8.0 |
Total |  | $ | 538.1 |  |  | $ | 59.7 |  |  | $ | 51.8 |  |  | $ | 40.0 |  |  | $ | 38.6 |  |  | $ | 38.2 |  |  | $ | 309.8 |
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, 2021 and 2020. Environmental Obligations ($ millions)
|  | December 31, |
|  | 2021 |  |  | 2020 |
Total Balance at Beginning of Period |  | $ | 2.1 |  |  | $ | 2.7 |
Additions |  |  | 0.9 |  |  |  | 0.2 |
Less: Payments / Reductions |  |  | 0.3 |  |  |  | 0.8 |
Total Balance at End of Period |  |  | 2.7 |  |  |  | 2.1 |
Less: Current Portion |  |  | 0.5 |  |  |  | 0.3 |
Noncurrent Balance at End of Period |  | $ | 2.2 |  |  | $ | 1.8 |

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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 -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph (a) -Subparagraph (5) + Details
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