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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)
 3 Months Ended
Mar. 31, 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 Three Months Ended March 31, 2019
 
For the Three Months Ended March 31, 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
—

 
0.7

 
—

 
0.7

 
—

 
(0.4
)
 
—

 
(0.4
)
Amounts Reclassified from AOCI
0.3

 
—

 
1.2

 
1.5

 
0.7

 
—

 
3.0

 
3.7

Net OCI
0.3

 
0.7

 
1.2

 
2.2

 
0.7

 
(0.4
)
 
3.0

 
3.3

Balance as of March 31st
$
(4.1
)
 
$
0.2

 
$
(53.9
)
 
$
(57.8
)
 
$
(5.5
)
 
$
(0.4
)
 
$
(57.2
)
 
$
(63.1
)