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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2024
Equity [Abstract] |
Changes in Accumulated Other Comprehensive Income/(Loss) by Component, Net of Tax | The changes in accumulated other comprehensive income/(loss) by component, net of tax, are as follows:
| For the Year Ended December 31, 2024 |  | For the Year Ended December 31, 2023
Eversource (Millions of Dollars) | Qualified Cash Flow Hedging Instruments |  |  |  | Defined Benefit Plans |  | Total |  | Qualified Cash Flow Hedging Instruments |  | Unrealized Losses on Marketable Securities |  | Defined Benefit Plans |  | Total
Balance as of January 1st | $ | (0.4) |  |  |  |  | $ | (33.3) |  |  | $ | (33.7) |  |  | $ | (0.4) |  |  | $ | (1.2) |  |  | $ | (37.8) |  |  | $ | (39.4) |
OCI Before Reclassifications | — |  |  |  |  | (2.5) |  |  | (2.5) |  |  | — |  |  | — |  |  | (8.8) |  |  | (8.8) |
Amounts Reclassified from AOCI | — |  |  |  |  | 9.7 |  |  | 9.7 |  |  | — |  |  | 1.2 |  |  | 13.3 |  |  | 14.5 |
Net OCI | — |  |  |  |  | 7.2 |  |  | 7.2 |  |  | — |  |  | 1.2 |  |  | 4.5 |  |  | 5.7 |
Balance as of December 31st | $ | (0.4) |  |  |  |  | $ | (26.1) |  |  | $ | (26.5) |  |  | $ | (0.4) |  |  | $ | — |  |  | $ | (33.3) |  |  | $ | (33.7) |
Schedule of Amounts Reclassified from AOCI by Component | The following table sets forth the amounts reclassified from AOCI by component and the impacted line item on the statements of income:
| Amounts Reclassified from AOCI |  |
Eversource (Millions of Dollars) | For the Years Ended December 31, |  | Statements of Income Line Item Impacted
2024 |  | 2023 |  | 2022 |
Unrealized Loss on Marketable Securities | — |  |  | (1.6) |  |  | — |  |  | Other Income, Net
Tax Effect | — |  |  | 0.4 |  |  | — |  |  | Income Tax Expense
Unrealized Loss on Marketable Securities, Net of Tax | — |  |  | (1.2) |  |  | — |  |  |
Defined Benefit Plan Costs: |  |  |  |  |  |  |
Amortization of Actuarial Losses | (6.8) |  |  | (7.0) |  |  | (9.0) |  |  | Other Income, Net (1)
Amortization of Prior Service Cost | (0.3) |  |  | (0.3) |  |  | (0.3) |  |  | Other Income, Net (1)
Settlement Losses | (4.3) |  |  | (12.4) |  |  | — |  |  | Other Income, Net (1)
Total Defined Benefit Plan Costs | (11.4) |  |  | (19.7) |  |  | (9.3) |  |  |
Tax Effect | 1.7 |  |  | 6.4 |  |  | 2.3 |  |  | Income Tax Expense
Defined Benefit Plan Costs, Net of Tax | (9.7) |  |  | (13.3) |  |  | (7.0) |  |  |
Total Amounts Reclassified from AOCI, Net of Tax | $ | (9.7) |  |  | $ | (14.5) |  |  | $ | (7.0) |  |  |
(1) These amounts are included in the computation of net periodic Pension, SERP and PBOP costs. See Note 1L, "Summary of Significant Accounting Policies – Other Income, Net" and Note 11A, "Employee Benefits – Pension Benefits and Postretirement Benefits Other Than Pension," for further information.

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 1 -Section 45 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-1 + Details
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