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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020.
|  |  |  |  | Payments Due by Period |
Gas and Electric Supply Contractual Obligations (millions) as of December 31, 2020 |  | Total |  |  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | 2025 |  |  | 2026 & Beyond |
Gas Supply Contracts |  | $ | 556.2 |  |  | $ | 55.9 |  |  | $ | 49.3 |  |  | $ | 46.5 |  |  | $ | 37.6 |  |  | $ | 36.2 |  |  | $ | 330.7 |
Electric Supply Contracts |  |  | 15.6 |  |  |  | 1.3 |  |  |  | 1.3 |  |  |  | 1.4 |  |  |  | 1.4 |  |  |  | 1.4 |  |  |  | 8.8 |
Total |  | $ | 571.8 |  |  | $ | 57.2 |  |  | $ | 50.6 |  |  | $ | 47.9 |  |  | $ | 39.0 |  |  | $ | 37.6 |  |  | $ | 339.5 |
Environmental Obligations Recognized by Company | The following table sets forth a summary of changes in the Company’s liability for the current and long-term portions of the Company’s environmental obligations, which are included in Other Current Liabilities and Other Noncurrent Liabilities, respectively, on the Company’s Consolidated Balance Sheets as of December 31, 2020 and 2019. Environmental Obligations
|  | (millions) |
|  | Fitchburg |  |  | Northern Utilities |  |  | Total |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Total Balance at Beginning of Period |  | $ | — |  |  | $ | — |  |  | $ | 2.7 |  |  | $ | 2.0 |  |  | $ | 2.7 |  |  | $ | 2.0 |
Additions |  |  | 0.1 |  |  |  | — |  |  |  | 0.1 |  |  |  | 0.9 |  |  |  | 0.2 |  |  |  | 0.9 |
Less: Payments / Reductions |  |  | — |  |  |  | — |  |  |  | 0.8 |  |  |  | 0.2 |  |  |  | 0.8 |  |  |  | 0.2 |
Total Balance at End of Period |  | $ | 0.1 |  |  | $ | — |  |  | $ | 2.0 |  |  | $ | 2.7 |  |  | $ | 2.1 |  |  | $ | 2.7 |
Less: Current Portion |  |  | 0.1 |  |  |  | — |  |  |  | 0.2 |  |  |  | 0.6 |  |  |  | 0.3 |  |  |  | 0.6 |
Noncurrent Balance at December 31, |  | $ | — |  |  | $ | — |  |  | $ | 1.8 |  |  | $ | 2.1 |  |  | $ | 1.8 |  |  | $ | 2.1 |

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