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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables) | 9 Months Ended
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Sep. 30, 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 Nine Months Ended September 30, 2024 |  | For the Nine Months Ended September 30, 2023
Eversource (Millions of Dollars) | Qualified Cash Flow Hedging Instruments |  | Defined Benefit Plans |  | Total |  | Qualified Cash Flow Hedging Instruments |  | Unrealized Gains/(Losses) on Marketable Securities |  | Defined Benefit Plans |  | Total
Balance as of Beginning of Period | $ | (0.4) |  |  | $ | (33.3) |  |  | $ | (33.7) |  |  | $ | (0.4) |  |  | $ | (1.2) |  |  | $ | (37.8) |  |  | $ | (39.4) |
OCI Before Reclassifications | — |  |  | (0.9) |  |  | (0.9) |  |  | — |  |  | — |  |  | 0.1 |  |  | 0.1 |
Amounts Reclassified from AOCI | — |  |  | 6.4 |  |  | 6.4 |  |  | — |  |  | 1.2 |  |  | 14.1 |  |  | 15.3 |
Net OCI | — |  |  | 5.5 |  |  | 5.5 |  |  | — |  |  | 1.2 |  |  | 14.2 |  |  | 15.4 |
Balance as of End of Period | $ | (0.4) |  |  | $ | (27.8) |  |  | $ | (28.2) |  |  | $ | (0.4) |  |  | $ | — |  |  | $ | (23.6) |  |  | $ | (24.0) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
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