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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020
 
For the Nine Months Ended September 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
—

 
0.3

 
(1.6
)
 
(1.3
)
 
—

 
1.3

 
2.6

 
3.9

Amounts Reclassified from AOCI
1.2

 
—

 
4.8

 
6.0

 
0.9

 
—

 
3.2

 
4.1

Net OCI
1.2

 
0.3

 
3.2

 
4.7

 
0.9

 
1.3

 
5.8

 
8.0

Balance as of September 30th
$
(1.8
)
 
$
1.0

 
$
(59.6
)
 
$
(60.4
)
 
$
(3.5
)
 
$
0.8

 
$
(49.3
)
 
$
(52.0
)