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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)
 6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Changes in Accumulated Other Comprehensive Income/(Loss) by Component, Net of Tax

The changes in accumulated other comprehensive income/(loss) by component, net of tax, are as follows:
 
For the Six Months Ended June 30, 2019
 
For the Six Months Ended June 30, 2018
Eversource 
(Millions of Dollars)
Qualified
Cash Flow
Hedging
Instruments
 
Unrealized
Gains/(Losses)
 on Marketable
Securities
 
Defined
Benefit Plans
 
Total
 
Qualified
Cash Flow
Hedging
Instruments
 
Unrealized
Losses on
Marketable
Securities
 
Defined
Benefit Plans
 
Total
Balance as of January 1st
$
(4.4
)
 
$
(0.5
)
 
$
(55.1
)
 
$
(60.0
)
 
$
(6.2
)
 
$
—

 
$
(60.2
)
 
$
(66.4
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
OCI Before Reclassifications
—

 
1.1

 
2.6

 
3.7

 
—

 
(0.6
)
 
2.6

 
2.0

Amounts Reclassified from AOCI
0.6

 
—

 
2.1

 
2.7

 
1.2

 
—

 
2.2

 
3.4

Net OCI
0.6

 
1.1

 
4.7

 
6.4

 
1.2

 
(0.6
)
 
4.8

 
5.4

Balance as of June 30th
$
(3.8
)
 
$
0.6

 
$
(50.4
)
 
$
(53.6
)
 
$
(5.0
)
 
$
(0.6
)
 
$
(55.4
)
 
$
(61.0
)