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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)
 12 Months Ended
Dec. 31, 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 Year Ended December 31, 2017
 
For the Year Ended December 31, 2016
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
Gains/(Losses)
on Marketable
Securities
 
Defined
Benefit
Plans
 
Total
Balance as of January 1st
$
(8.2
)
 
$
0.4

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

 
(0.4
)
 
(7.2
)
 
(7.6
)
 
—

 
2.3

 
(6.8
)
 
(4.5
)
Amounts Reclassified from AOCL
2.0

 
—

 
4.5

 
6.5

 
2.1

 
—

 
3.9

 
6.0

  Net OCI
2.0

 
(0.4
)
 
(2.7
)
 
(1.1
)

2.1

 
2.3

 
(2.9
)
 
1.5

Balance as of December 31st
$
(6.2
)
 
$
—

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

 
$
(57.5
)
 
$
(65.3
)
Schedule of Comprehensive Income (Loss)
The following table sets forth the amounts reclassified from AOCL by component and the impacted line item on the statements of income:
 
Amounts Reclassified from AOCL
 
 
Eversource
(Millions of Dollars)
For the Years Ended December 31,
 
Statements of Income
Line Item Impacted
2017
 
2016
 
2015
 
Qualified Cash Flow Hedging Instruments
$
(3.3
)
 
$
(3.5
)
 
$
(3.5
)
 
Interest Expense
Tax Effect
1.3

 
1.4

 
1.4

 
Income Tax Expense
Qualified Cash Flow Hedging Instruments, Net of Tax
$
(2.0
)
 
$
(2.1
)
 
$
(2.1
)
 
 
Defined Benefit Plan Costs:
 

 
 

 
 

 
 
Amortization of Actuarial Losses
$
(6.2
)
 
$
(5.6
)
 
$
(6.6
)
 
Operations and Maintenance Expense (1)
Amortization of Prior Service Cost
(1.1
)
 
(0.8
)
 
(0.2
)
 
Operations and Maintenance Expense (1)
Total Defined Benefit Plan Costs
(7.3
)
 
(6.4
)
 
(6.8
)
 
 
Tax Effect
2.8

 
2.5

 
2.6

 
Income Tax Expense
Defined Benefit Plan Costs, Net of Tax
$
(4.5
)
 
$
(3.9
)
 
$
(4.2
)
 
 
Total Amounts Reclassified from AOCL, Net of Tax
$
(6.5
)
 
$
(6.0
)
 
$
(6.3
)
 
 

(1)
These amounts are included in the computation of net periodic Pension, SERP and PBOP costs.  See Note 9A, "Employee Benefits – Pension Benefits and Postretirement Benefits Other Than Pensions," for further information.