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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)
 3 Months Ended
Mar. 31, 2018
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, is as follows:
 
For the Three Months Ended March 31, 2018
 
For the Three Months Ended March 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 on
Marketable
Securities
 
Defined
Benefit Plans
 
Total
Balance as of Beginning of Period
$
(6.2
)
 
$
—

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

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

 
(0.4
)
 
—

 
(0.4
)
 
—

 
1.7

 
—

 
1.7

Amounts Reclassified from AOCI
0.7

 
—

 
3.0

 
3.7

 
0.5

 
—

 
1.0

 
1.5

Net OCI
0.7

 
(0.4
)
 
3.0

 
3.3

 
0.5

 
1.7

 
1.0

 
3.2

Balance as of End of Period
$
(5.5
)
 
$
(0.4
)
 
$
(57.2
)
 
$
(63.1
)
 
$
(7.7
)
 
$
2.1

 
$
(56.5
)
 
$
(62.1
)


Eversource's qualified cash flow hedging instruments represent interest rate swap agreements on debt issuances that were settled in prior years. The settlement amount was recorded in AOCI and is being amortized into Net Income over the term of the underlying debt instrument.  CL&P, NSTAR Electric and PSNH continue to amortize interest rate swaps settled in prior years from AOCI into Interest Expense over the remaining life of the associated long-term debt. Such interest rate swaps are not material to their respective financial statements.

Defined benefit plan OCI amounts before reclassifications relate to actuarial gains and losses and prior service costs 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. For further information, see Note 1F, "Summary of Significant Accounting Policies - Other Income, Net," and Note 7, "Pension Benefits and Postretirement Benefits Other Than Pension."