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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)
 9 Months Ended
Sep. 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 Nine Months Ended September 30, 2019
 
For the Nine Months Ended September 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
—

 
1.3

 
2.6

 
3.9

 
—

 
(0.7
)
 
2.6

 
1.9

Amounts Reclassified from AOCI
0.9

 
—

 
3.2

 
4.1

 
1.6

 
—

 
3.3

 
4.9

Net OCI
0.9

 
1.3

 
5.8

 
8.0

 
1.6

 
(0.7
)
 
5.9

 
6.8

Balance as of September 30th
$
(3.5
)
 
$
0.8

 
$
(49.3
)
 
$
(52.0
)
 
$
(4.6
)
 
$
(0.7
)
 
$
(54.3
)
 
$
(59.6
)