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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The changes in accumulated other comprehensive income/(loss) by component, net of tax, is as follows:
 
For the Nine Months Ended September 30, 2017
 
For the Nine Months Ended September 30, 2016
 
Qualified
 
Unrealized
 
 
 
 
 
Qualified
 
Unrealized
 
 
 
 
 
Cash Flow
 
Gains
 
 
 
 
 
Cash Flow
 
Gains/(Losses)
 
 
 
 
Eversource
(Millions of Dollars)
Hedging
 
on Marketable
 
Defined
 
 
 
Hedging
 
on Marketable
 
Defined
 
 
Instruments
 
Securities
 
Benefit Plans
 
 Total
 
Instruments
 
Securities
 
Benefit Plans
 
 Total
Balance as of Beginning of Period
$
(8.2
)
 
$
0.4

 
$
(57.5
)
 
$
(65.3
)
 
$
(10.3
)
 
$
(1.9
)
 
$
(54.6
)
 
$
(66.8
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
OCI Before Reclassifications
—

 
0.7

 
(3.5
)
 
(2.8
)
 
—

 
2.3

 
(5.3
)
 
(3.0
)
Amounts Reclassified from AOCL
1.6

 
—

 
2.9

 
4.5

 
1.6

 
—

 
2.6

 
4.2

Net OCI
1.6

 
0.7

 
(0.6
)
 
1.7

 
1.6

 
2.3

 
(2.7
)
 
1.2

Balance as of End of Period
$
(6.6
)
 
$
1.1

 
$
(58.1
)
 
$
(63.6
)
 
$
(8.7
)
 
$
0.4

 
$
(57.3
)
 
$
(65.6
)