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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables) | 3 Months Ended
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Mar. 31, 2022
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 Three Months Ended March 31, 2022 |  | For the Three Months Ended March 31, 2021
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/(Losses) on Marketable Securities |  | Defined Benefit Plans |  | Total
Balance as of Beginning of Period | $ | (0.4) |  |  | $ | 0.4 |  |  | $ | (42.3) |  |  | $ | (42.3) |  |  | $ | (1.4) |  |  | $ | 1.1 |  |  | $ | (76.1) |  |  | $ | (76.4) |
OCI Before Reclassifications | — |  |  | (0.8) |  |  | — |  |  | (0.8) |  |  | — |  |  | (0.7) |  |  | — |  |  | (0.7) |
Amounts Reclassified from AOCI | — |  |  | — |  |  | 1.5 |  |  | 1.5 |  |  | 0.4 |  |  | — |  |  | 1.5 |  |  | 1.9 |
Net OCI | — |  |  | (0.8) |  |  | 1.5 |  |  | 0.7 |  |  | 0.4 |  |  | (0.7) |  |  | 1.5 |  |  | 1.2 |
Balance as of End of Period | $ | (0.4) |  |  | $ | (0.4) |  |  | $ | (40.8) |  |  | $ | (41.6) |  |  | $ | (1.0) |  |  | $ | 0.4 |  |  | $ | (74.6) |  |  | $ | (75.2) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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