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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)
 3 Months Ended
Mar. 31, 2018
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 Three Months Ended March 31, 2018
 
For the Three Months Ended March 31, 2017
Eversource 
(Millions of Dollars)
Qualified
Cash Flow
Hedging
Instruments
 
Unrealized
Losses on
Marketable
Securities
 
Defined
Benefit Plans
 
Total
 
Qualified
Cash Flow
Hedging
Instruments
 
Unrealized
Gains on
Marketable
Securities
 
Defined
Benefit Plans
 
Total
Balance as of Beginning of Period
$
(6.2
)
 
$
—

 
$
(60.2
)
 
$
(66.4
)
 
$
(8.2
)
 
$
0.4

 
$
(57.5
)
 
$
(65.3
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
OCI Before Reclassifications
—

 
(0.4
)
 
—

 
(0.4
)
 
—

 
1.7

 
—

 
1.7

Amounts Reclassified from AOCI
0.7

 
—

 
3.0

 
3.7

 
0.5

 
—

 
1.0

 
1.5

Net OCI
0.7

 
(0.4
)
 
3.0

 
3.3

 
0.5

 
1.7

 
1.0

 
3.2

Balance as of End of Period
$
(5.5
)
 
$
(0.4
)
 
$
(57.2
)
 
$
(63.1
)
 
$
(7.7
)
 
$
2.1

 
$
(56.5
)
 
$
(62.1
)