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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2021 |  | For the Year Ended December 31, 2020
Eversource (Millions of Dollars) | Qualified Cash Flow Hedging Instruments |  | Unrealized Gains/(Losses) on Marketable Securities |  | Defined Benefit Plans |  | Total |  | Qualified Cash Flow Hedging Instruments |  | Unrealized Gains on Marketable Securities |  | Defined Benefit Plans |  | Total
Balance as of January 1st | $ | (1.4) |  |  | $ | 1.1 |  |  | $ | (76.1) |  |  | $ | (76.4) |  |  | $ | (3.0) |  |  | $ | 0.7 |  |  | $ | (62.8) |  |  | $ | (65.1) |
OCI Before Reclassifications | — |  |  | (0.7) |  |  | 24.1 |  |  | 23.4 |  |  | — |  |  | 0.4 |  |  | (19.6) |  |  | (19.2) |
Amounts Reclassified from AOCI | 1.0 |  |  | — |  |  | 9.7 |  |  | 10.7 |  |  | 1.6 |  |  | — |  |  | 6.3 |  |  | 7.9 |
Net OCI | 1.0 |  |  | (0.7) |  |  | 33.8 |  |  | 34.1 |  |  | 1.6 |  |  | 0.4 |  |  | (13.3) |  |  | (11.3) |
Balance as of December 31st | $ | (0.4) |  |  | $ | 0.4 |  |  | $ | (42.3) |  |  | $ | (42.3) |  |  | $ | (1.4) |  |  | $ | 1.1 |  |  | $ | (76.1) |  |  | $ | (76.4) |
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
2021 |  | 2020 |  | 2019 |
Qualified Cash Flow Hedging Instruments | $ | (1.7) |  |  | $ | (2.5) |  |  | $ | (2.5) |  |  | Interest Expense
Tax Effect | 0.7 |  |  | 0.9 |  |  | 1.1 |  |  | Income Tax Expense
Qualified Cash Flow Hedging Instruments, Net of Tax | $ | (1.0) |  |  | $ | (1.6) |  |  | $ | (1.4) |  |  |
Defined Benefit Plan Costs: |  |  |  |  |  |  |
Amortization of Actuarial Losses | $ | (13.1) |  |  | $ | (8.1) |  |  | $ | (5.7) |  |  | Other Income, Net (1)
Amortization of Prior Service Credit/(Cost) | — |  |  | (0.3) |  |  | (1.8) |  |  | Other Income, Net (1)
Total Defined Benefit Plan Costs | (13.1) |  |  | (8.4) |  |  | (7.5) |  |  |
Tax Effect | 3.4 |  |  | 2.1 |  |  | 1.9 |  |  | Income Tax Expense
Defined Benefit Plan Costs, Net of Tax | $ | (9.7) |  |  | $ | (6.3) |  |  | $ | (5.6) |  |  |
Total Amounts Reclassified from AOCI, Net of Tax | $ | (10.7) |  |  | $ | (7.9) |  |  | $ | (7.0) |  |  |
(1) These amounts are included in the computation of net periodic Pension, SERP and PBOP costs. See Note 1M, "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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e526-108580 + Details
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