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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)
 6 Months Ended
Jun. 30, 2020
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, are as follows:
 
For the Six Months Ended June 30, 2020
 
For the Six Months Ended June 30, 2019
Eversource 
(Millions of Dollars)
Qualified
Cash Flow
Hedging
Instruments
 
Unrealized
Gains 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
$
(3.0
)
 
$
0.7

 
$
(62.8
)
 
$
(65.1
)
 
$
(4.4
)
 
$
(0.5
)
 
$
(55.1
)
 
$
(60.0
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
OCI Before Reclassifications
—

 
0.4

 
(1.6
)
 
(1.2
)
 
—

 
1.1

 
2.6

 
3.7

Amounts Reclassified from AOCI
0.6

 
—

 
3.1

 
3.7

 
0.6

 
—

 
2.1

 
2.7

Net OCI
0.6

 
0.4

 
1.5

 
2.5

 
0.6

 
1.1

 
4.7

 
6.4

Balance as of June 30th
$
(2.4
)
 
$
1.1

 
$
(61.3
)
 
$
(62.6
)
 
$
(3.8
)
 
$
0.6

 
$
(50.4
)
 
$
(53.6
)


Defined benefit plan OCI amounts before reclassifications relate to actuarial gains and losses 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.