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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)
12 Months Ended
Dec. 31, 2020
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, 2020For the Year Ended December 31, 2019
Eversource
(Millions of Dollars)
Qualified
Cash Flow
Hedging
Instruments
Unrealized
Gains
on Marketable
Securities
Defined
Benefit
Plans
TotalQualified
Cash Flow
Hedging
Instruments
Unrealized
Gains/(Losses)
on Marketable
Securities
Defined
Benefit
Plans
Total
Balance as of January 1st$(3.0)$0.7 $(62.8)$(65.1)$(4.4)$(0.5)$(55.1)$(60.0)
OCI Before Reclassifications— 0.4 (19.6)(19.2)— 1.2 (13.3)(12.1)
Amounts Reclassified from AOCI1.6 — 6.3 7.9 1.4 — 5.6 7.0 
  Net OCI1.6 0.4 (13.3)(11.3)1.4 1.2 (7.7)(5.1)
Balance as of December 31st$(1.4)$1.1 $(76.1)$(76.4)$(3.0)$0.7 $(62.8)$(65.1)
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
202020192018
Qualified Cash Flow Hedging Instruments$(2.5)$(2.5)$(2.8)Interest Expense
Tax Effect0.9 1.1 1.0 Income Tax Expense
Qualified Cash Flow Hedging Instruments, Net of Tax$(1.6)$(1.4)$(1.8) 
Defined Benefit Plan Costs:    
Amortization of Actuarial Losses$(8.1)$(5.7)$(6.0)
Other Income, Net (1)
Amortization of Prior Service Cost(0.3)(1.8)(0.4)
Other Income, Net (1)
Total Defined Benefit Plan Costs(8.4)(7.5)(6.4) 
Tax Effect2.1 1.9 1.6 Income Tax Expense
Defined Benefit Plan Costs, Net of Tax$(6.3)$(5.6)$(4.8) 
Total Amounts Reclassified from AOCI, Net of Tax$(7.9)$(7.0)$(6.6) 

(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.