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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)
12 Months Ended
Dec. 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 Year Ended December 31, 2019
 
For the Year Ended December 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

 
1.2

 
(13.3
)
 
(12.1
)
 

 
(0.5
)
 
0.3

 
(0.2
)
Amounts Reclassified from AOCI
1.4

 

 
5.6

 
7.0

 
1.8

 

 
4.8

 
6.6

  Net OCI
1.4

 
1.2

 
(7.7
)
 
(5.1
)

1.8

 
(0.5
)
 
5.1

 
6.4

Balance as of December 31st
$
(3.0
)
 
$
0.7

 
$
(62.8
)
 
$
(65.1
)
 
$
(4.4
)
 
$
(0.5
)
 
$
(55.1
)
 
$
(60.0
)

Schedule of Amounts Reclassified From AOCI By Component
The following table sets forth the amounts reclassified from AOCI by component and the impacted line item on the statements of income:
 
Amounts Reclassified from AOCI
 
 
Eversource
(Millions of Dollars)
For the Years Ended December 31,
 
Statements of Income
Line Item Impacted
2019
 
2018
 
2017
 
Qualified Cash Flow Hedging Instruments
$
(2.5
)
 
$
(2.8
)
 
$
(3.3
)
 
Interest Expense
Tax Effect
1.1

 
1.0

 
1.3

 
Income Tax Expense
Qualified Cash Flow Hedging Instruments, Net of Tax
$
(1.4
)
 
$
(1.8
)
 
$
(2.0
)
 
 
Defined Benefit Plan Costs:
 

 
 

 
 

 
 
Amortization of Actuarial Losses
$
(5.7
)
 
$
(6.0
)
 
$
(6.2
)
 
Other Income, Net (1)
Amortization of Prior Service Cost
(1.8
)
 
(0.4
)
 
(1.1
)
 
Other Income, Net (1)
Total Defined Benefit Plan Costs
(7.5
)
 
(6.4
)
 
(7.3
)
 
 
Tax Effect
1.9

 
1.6

 
2.8

 
Income Tax Expense
Defined Benefit Plan Costs, Net of Tax
$
(5.6
)
 
$
(4.8
)
 
$
(4.5
)
 
 
Total Amounts Reclassified from AOCI, Net of Tax
$
(7.0
)
 
$
(6.6
)
 
$
(6.5
)
 
 

(1) 
These amounts are included in the computation of net periodic Pension, SERP and PBOP costs.  See Note 1M, "Summary of Significant Accounting Policies – Other Income, Net" and Note 11A, "Employee Benefits – Pension Benefits and Postretirement Benefits Other Than Pension," for further information.