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ENVIRONMENTAL MATTERS (Tables) | 9 Months Ended
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Sep. 30, 2019
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 September 30, 2019 and 2018.
Environmental Obligations
|  | ($ millions) |
|  | Fitchburg |  |  | Northern Utilities |  |  | Total |
|  | Nine months ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Total Balance at Beginning of Period |  | $ | — |  |  | $ | 0.1 |  |  | $ | 2.0 |  |  | $ | 2.0 |  |  | $ | 2.0 |  |  | $ | 2.1 |
Additions |  |  | — |  |  |  | — |  |  |  | 1.0 |  |  |  | 0.6 |  |  |  | 1.0 |  |  |  | 0.6 |
Less: Payments / Reductions |  |  | — |  |  |  | 0.1 |  |  |  | 0.2 |  |  |  | 0.5 |  |  |  | 0.2 |  |  |  | 0.6 |
Total Balance at End of Period |  |  | — |  |  |  | — |  |  |  | 2.8 |  |  |  | 2.1 |  |  |  | 2.8 |  |  |  | 2.1 |
Less: Current Portion |  |  | — |  |  |  | — |  |  |  | 0.6 |  |  |  | 0.6 |  |  |  | 0.6 |  |  |  | 0.6 |
Noncurrent Balance at End of Period |  | $ | — |  |  | $ | — |  |  | $ | 2.2 |  |  | $ | 1.5 |  |  | $ | 2.2 |  |  | $ | 1.5 |

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