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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)
 9 Months Ended
Sep. 30, 2016
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 Nine Months Ended September 30, 2016
 
For the Nine Months Ended September 30, 2015
 
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 
Eversource
(Millions of Dollars)
 
 
 
 
 
 
 
Balance as of Beginning of Period
$
(10.3
)
 
$
(1.9
)
 
$
(54.6
)
 
$
(66.8
)
 
$
(12.4
)
 
$
0.7

 
$
(62.3
)
 
$
(74.0
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
OCI Before Reclassifications
—

 
2.3

 
(5.3
)
 
(3.0
)
 
—

 
(3.9
)
 
(0.4
)
 
(4.3
)
Amounts Reclassified from AOCI
1.6

 
—

 
2.6

 
4.2

 
1.5

 
—

 
3.3

 
4.8

Net OCI
1.6

 
2.3

 
(2.7
)
 
1.2

 
1.5

 
(3.9
)
 
2.9

 
0.5

Balance as of End of Period
$
(8.7
)
 
$
0.4

 
$
(57.3
)
 
$
(65.6
)
 
$
(10.9
)
 
$
(3.2
)
 
$
(59.4
)
 
$
(73.5
)


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, PSNH and WMECO 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. For further information see Note 7, “Pension Benefits and Postretirement Benefits Other Than Pensions.” The unamortized actuarial gains and losses and prior service costs on the defined benefit plans are amortized from AOCI into Operations and Maintenance expense over the average future employee service period, and are reflected in amounts reclassified from AOCI.