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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The changes in accumulated other comprehensive income/(loss) by component, net of tax, are as follows:
 
For the Year Ended December 31, 2018
 
For the Year Ended December 31, 2017
Eversource
(Millions of Dollars)
Qualified
Cash Flow
Hedging
Instruments
 
Unrealized
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 January 1st
$
(6.2
)
 
$
—

 
$
(60.2
)
 
$
(66.4
)
 
$
(8.2
)
 
$
0.4

 
$
(57.5
)
 
$
(65.3
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
OCI Before Reclassifications
—

 
(0.5
)
 
0.3

 
(0.2
)
 
—

 
(0.4
)
 
(7.2
)
 
(7.6
)
Amounts Reclassified from AOCI
1.8

 
—

 
4.8

 
6.6

 
2.0

 
—

 
4.5

 
6.5

  Net OCI
1.8

 
(0.5
)
 
5.1

 
6.4


2.0

 
(0.4
)
 
(2.7
)
 
(1.1
)
Balance as of December 31st
$
(4.4
)
 
$
(0.5
)
 
$
(55.1
)
 
$
(60.0
)
 
$
(6.2
)
 
$
—

 
$
(60.2
)
 
$
(66.4
)
Schedule of Comprehensive Income (Loss)
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
2018
 
2017
 
2016
 
Qualified Cash Flow Hedging Instruments
$
(2.8
)
 
$
(3.3
)
 
$
(3.5
)
 
Interest Expense
Tax Effect
1.0

 
1.3

 
1.4

 
Income Tax Expense
Qualified Cash Flow Hedging Instruments, Net of Tax
$
(1.8
)
 
$
(2.0
)
 
$
(2.1
)
 
 
Defined Benefit Plan Costs:
 

 
 

 
 

 
 
Amortization of Actuarial Losses
$
(6.0
)
 
$
(6.2
)
 
$
(5.6
)
 
Other Income, Net (1)
Amortization of Prior Service Cost
(0.4
)
 
(1.1
)
 
(0.8
)
 
Other Income, Net (1)
Total Defined Benefit Plan Costs
(6.4
)
 
(7.3
)
 
(6.4
)
 
 
Tax Effect
1.6

 
2.8

 
2.5

 
Income Tax Expense
Defined Benefit Plan Costs, Net of Tax
$
(4.8
)
 
$
(4.5
)
 
$
(3.9
)
 
 
Total Amounts Reclassified from AOCI, Net of Tax
$
(6.6
)
 
$
(6.5
)
 
$
(6.0
)
 
 

(1) 
These amounts are included in the computation of net periodic Pension, SERP and PBOP costs.  See Note 1N, "Summary of Significant Accounting Policies – Other Income, Net" and Note 10A, "Employee Benefits – Pension Benefits and Postretirement Benefits Other Than Pension," for further information.