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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)
 6 Months Ended
Jun. 30, 2017
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 Six Months Ended June 30, 2017
 
For the Six Months Ended June 30, 2016
 
Qualified
 
Unrealized
 
 
 
 
 
Qualified
 
Unrealized
 
 
 
 
 
Cash Flow
 
Gains
 
 
 
 
 
Cash Flow
 
Gains/(Losses)
 
 
 
 
Eversource
(Millions of Dollars)
Hedging
 
on Marketable
 
Defined
 
 
 
Hedging
 
on Marketable
 
Defined
 
 
Instruments
 
Securities
 
Benefit Plans
 
 Total
 
Instruments
 
Securities
 
Benefit Plans
 
 Total
Balance as of Beginning of Period
$
(8.2
)
 
$
0.4

 
$
(57.5
)
 
$
(65.3
)
 
$
(10.3
)
 
$
(1.9
)
 
$
(54.6
)
 
$
(66.8
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
OCI Before Reclassifications
—

 
2.6

 
(3.5
)
 
(0.9
)
 
—

 
1.3

 
(2.6
)
 
(1.3
)
Amounts Reclassified from AOCL
1.1

 
—

 
2.2

 
3.3

 
1.1

 
—

 
1.6

 
2.7

Net OCI
1.1

 
2.6

 
(1.3
)
 
2.4

 
1.1

 
1.3

 
(1.0
)
 
1.4

Balance as of End of Period
$
(7.1
)
 
$
3.0

 
$
(58.8
)
 
$
(62.9
)
 
$
(9.2
)
 
$
(0.6
)
 
$
(55.6
)
 
$
(65.4
)


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