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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2016
 
For the Nine Months Ended September 30, 2015
 
Qualified  
Cash Flow Hedging Instruments
 
Unrealized
Gains/(Losses) on Marketable Securities
 
Defined Benefit Plans
 
 Total
 
Qualified  
Cash Flow Hedging Instruments
 
Unrealized
Gains/(Losses) on Marketable Securities
 
Defined Benefit Plans
 
Total 
Eversource
(Millions of Dollars)
 
 
 
 
 
 
 
Balance as of Beginning of Period
$
(10.3
)
 
$
(1.9
)
 
$
(54.6
)
 
$
(66.8
)
 
$
(12.4
)
 
$
0.7

 
$
(62.3
)
 
$
(74.0
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
OCI Before Reclassifications
—

 
2.3

 
(5.3
)
 
(3.0
)
 
—

 
(3.9
)
 
(0.4
)
 
(4.3
)
Amounts Reclassified from AOCI
1.6

 
—

 
2.6

 
4.2

 
1.5

 
—

 
3.3

 
4.8

Net OCI
1.6

 
2.3

 
(2.7
)
 
1.2

 
1.5

 
(3.9
)
 
2.9

 
0.5

Balance as of End of Period
$
(8.7
)
 
$
0.4

 
$
(57.3
)
 
$
(65.6
)
 
$
(10.9
)
 
$
(3.2
)
 
$
(59.4
)
 
$
(73.5
)