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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) | 9 Months Ended
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Sep. 30, 2021
Equity [Abstract] |
ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) | ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) The changes in accumulated other comprehensive income/(loss) by component, net of tax, are as follows:
| For the Nine Months Ended September 30, 2021 |  | For the Nine Months Ended September 30, 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 Beginning of Period | $ | (1.4) |  |  | $ | 1.1 |  |  | $ | (76.1) |  |  | $ | (76.4) |  |  | $ | (3.0) |  |  | $ | 0.7 |  |  | $ | (62.8) |  |  | $ | (65.1) |
OCI Before Reclassifications | — |  |  | (0.6) |  |  | (2.4) |  |  | (3.0) |  |  | — |  |  | 0.3 |  |  | (1.6) |  |  | (1.3) |
Amounts Reclassified from AOCI | 1.0 |  |  | — |  |  | 6.5 |  |  | 7.5 |  |  | 1.2 |  |  | — |  |  | 4.8 |  |  | 6.0 |
Net OCI | 1.0 |  |  | (0.6) |  |  | 4.1 |  |  | 4.5 |  |  | 1.2 |  |  | 0.3 |  |  | 3.2 |  |  | 4.7 |
Balance as of End of Period | $ | (0.4) |  |  | $ | 0.5 |  |  | $ | (72.0) |  |  | $ | (71.9) |  |  | $ | (1.8) |  |  | $ | 1.0 |  |  | $ | (59.6) |  |  | $ | (60.4) |
Defined benefit plan OCI amounts before reclassifications relate to actuarial gains and losses that arose during the year and were recognized in AOCI. The unamortized actuarial gains and losses and prior service costs on the defined benefit plans are amortized from AOCI into Other Income, Net over the average future employee service period, and are reflected in amounts reclassified from AOCI.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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