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EMPLOYEE BENEFITS (Tables)
 12 Months Ended
Dec. 31, 2016
Postemployment Benefits [Abstract]  
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets
 The following tables provide information on the PBOP Plan benefit obligations, fair values of plan assets, and funded status:  
 
PBOP
Eversource
As of December 31,
(Millions of Dollars)
2016
 
2015
Change in Benefit Obligation:
 
 
 
Benefit Obligation as of Beginning of Year
$
(1,051.4
)
 
$
(1,147.9
)
Plan Amendment
244.0

 
—

Service Cost
(12.2
)
 
(16.3
)
Interest Cost
(32.9
)
 
(47.2
)
Actuarial Gain/(Loss)
(17.7
)
 
106.0

Benefits Paid
60.2

 
54.0

Benefit Obligation as of End of Year
$
(810.0
)
 
$
(1,051.4
)
Change in Plan Assets:
 
 
 
Fair Value of Plan Assets as of Beginning of Year
$
812.2

 
$
862.6

Actual Return on Plan Assets
51.3

 
(4.3
)
Employer Contributions
12.5

 
7.9

Benefits Paid
(60.2
)
 
(54.0
)
Fair Value of Plan Assets as of End of Year
$
815.8

 
$
812.2

Funded Status as of December 31st
$
5.8

 
$
(239.2
)
 
PBOP
 
As of December 31,
 
2016
 
2015
(Millions of Dollars)
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
 
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
Change in Benefit Obligation:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Benefit Obligation as of Beginning of Year
$
(164.0
)
 
$
(412.8
)
 
$
(88.5
)
 
$
(34.4
)
 
$
(173.9
)
 
$
(468.7
)
 
$
(91.8
)
 
$
(36.6
)
Plan Amendment
(12.5
)
 
195.3

 
(6.7
)
 
(1.7
)
 
—

 
—

 
—

 
—

Change due to transfer of employees
1.3

 
0.3

 
0.3

 
0.2

 
0.1

 
2.3

 
(0.3
)
 
—

Service Cost
(2.0
)
 
(3.0
)
 
(1.3
)
 
(0.4
)
 
(2.1
)
 
(5.4
)
 
(1.4
)
 
(0.4
)
Interest Cost
(5.3
)
 
(12.2
)
 
(2.9
)
 
(1.1
)
 
(7.2
)
 
(19.0
)
 
(3.9
)
 
(1.5
)
Actuarial Gain/(Loss)
3.6

 
(24.6
)
 
3.6

 
1.1

 
7.2

 
59.1

 
3.6

 
1.5

Benefits Paid
13.9

 
20.3

 
5.8

 
3.0

 
11.9

 
18.9

 
5.3

 
2.6

Benefit Obligation as of End of Year
$
(165.0
)
 
$
(236.7
)
 
$
(89.7
)
 
$
(33.3
)
 
$
(164.0
)
 
$
(412.8
)
 
$
(88.5
)
 
$
(34.4
)
Change in Plan Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fair Value of Plan Assets as of Beginning of Year
$
136.7

 
$
320.3

 
$
75.8

 
$
31.7

 
$
149.0

 
$
336.5

 
$
80.9

 
$
34.4

Change due to transfer of employees
(0.8
)
 
(0.3
)
 
(0.2
)
 
(0.3
)
 
—

 
0.6

 
0.2

 
—

Actual Return on Plan Assets
7.2

 
23.2

 
3.4

 
1.4

 
(0.4
)
 
(2.8
)
 
—

 
(0.1
)
Employer Contributions
—

 
8.9

 
—

 
—

 
—

 
4.9

 
—

 
—

Benefits Paid
(13.9
)
 
(20.3
)
 
(5.8
)
 
(3.0
)
 
(11.9
)
 
(18.9
)
 
(5.3
)
 
(2.6
)
Fair Value of Plan Assets as of End of Year
$
129.2

 
$
331.8

 
$
73.2

 
$
29.8

 
$
136.7

 
$
320.3

 
$
75.8

 
$
31.7

Funded Status as of December 31st
$
(35.8
)
 
$
95.1

 
$
(16.5
)
 
$
(3.5
)
 
$
(27.3
)
 
$
(92.5
)
 
$
(12.7
)
 
$
(2.7
)
The following tables provide information on the Pension and SERP Plan benefit obligations, fair values of Pension Plan assets, and funded status:  
 
Pension and SERP
Eversource
As of December 31,
(Millions of Dollars)
2016
 
2015
Change in Benefit Obligation:
 
 
 
Benefit Obligation as of Beginning of Year
$
(5,080.1
)
 
$
(5,486.2
)
Plan Amendment
(9.0
)
 
—

Service Cost
(75.0
)
 
(91.4
)
Interest Cost
(185.5
)
 
(227.0
)
Actuarial Gain/(Loss)
(151.8
)
 
331.5

Benefits Paid - Pension
254.0

 
238.5

Benefits Paid - Lump Sum
—

 
149.5

Benefits Paid - SERP
5.1

 
5.0

Benefit Obligation as of End of Year
$
(5,242.3
)
 
$
(5,080.1
)
Change in Pension Plan Assets:
 
 
 
Fair Value of Pension Plan Assets as of Beginning of Year
$
3,905.4

 
$
4,126.5

Employer Contributions
146.2

 
154.6

Actual Return on Pension Plan Assets
278.4

 
12.3

Benefits Paid
(254.0
)
 
(238.5
)
Benefits Paid - Lump Sum
—

 
(149.5
)
Fair Value of Pension Plan Assets as of End of Year
$
4,076.0

 
$
3,905.4

Funded Status as of December 31st
$
(1,166.3
)
 
$
(1,174.7
)
 
Pension and SERP
 
As of December 31, 2016
 
As of December 31, 2015
(Millions of Dollars)
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
 
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
Change in Benefit Obligation:
 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
Benefit Obligation as of Beginning of Year
$
(1,157.6
)
 
$
(949.7
)
 
$
(547.6
)
 
$
(237.6
)
 
$
(1,230.1
)
 
$
(982.6
)
 
$
(580.7
)
 
$
(249.4
)
Plan Amendment
—

 
(2.8
)
 
—

 
—

 
—

 
—

 
—

 
—

Change due to transfer of employees
8.8

 
(0.6
)
 
2.4

 
1.9

 
(4.6
)
 
6.2

 
(1.9
)
 
(1.3
)
Service Cost
(18.8
)
 
(13.2
)
 
(9.9
)
 
(3.1
)
 
(24.7
)
 
(14.9
)
 
(12.1
)
 
(4.3
)
Interest Cost
(41.6
)
 
(33.8
)
 
(20.7
)
 
(8.4
)
 
(51.1
)
 
(40.2
)
 
(24.3
)
 
(10.4
)
Actuarial Gain/(Loss)
(23.9
)
 
(33.3
)
 
(21.5
)
 
(3.9
)
 
77.8

 
34.1

 
38.9

 
12.6

Benefits Paid - Pension
62.6

 
53.8

 
24.9

 
13.2

 
60.2

 
47.6

 
23.2

 
12.7

Benefits Paid - Lump Sum
—

 
—

 
—

 
—

 
14.5

 
—

 
9.1

 
2.5

Benefits Paid - SERP
0.3

 
0.2

 
0.2

 
—

 
0.4

 
0.1

 
0.2

 
—

Benefit Obligation as of End of Year
$
(1,170.2
)
 
$
(979.4
)
 
$
(572.2
)
 
$
(237.9
)
 
$
(1,157.6
)
 
$
(949.7
)
 
$
(547.6
)
 
$
(237.6
)
Change in Pension Plan Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fair Value of Pension Plan Assets as of Beginning of Year
$
913.5

 
$
832.9

 
$
470.5

 
$
220.8

 
$
980.8

 
$
879.0

 
$
498.4

 
$
234.0

Change due to transfer of employees
(8.8
)
 
0.6

 
(2.4
)
 
(1.9
)
 
4.6

 
(6.2
)
 
1.9

 
1.3

Employer Contributions
0.4

 
28.4

 
17.1

 
—

 
—

 
5.0

 
1.0

 
—

Actual Return on Pension Plan Assets
63.0

 
59.2

 
33.7

 
15.3

 
2.8

 
2.7

 
1.5

 
0.7

Benefits Paid
(62.6
)
 
(53.8
)
 
(24.9
)
 
(13.2
)
 
(60.2
)
 
(47.6
)
 
(23.2
)
 
(12.7
)
Benefits Paid - Lump Sum
—

 
—

 
—

 
—

 
(14.5
)
 
—

 
(9.1
)
 
(2.5
)
Fair Value of Pension Plan Assets as of End of Year
$
905.5

 
$
867.3


$
494.0


$
221.0

 
$
913.5

 
$
832.9

 
$
470.5

 
$
220.8

Funded Status as of December 31st
$
(264.7
)
 
$
(112.1
)
 
$
(78.2
)
 
$
(16.9
)
 
$
(244.1
)
 
$
(116.8
)
 
$
(77.1
)
 
$
(16.8
)
Schedule of Defined Benefit Plans Disclosures
The components of net periodic benefit expense for the PBOP Plan are shown below.  The net periodic benefit expense and the intercompany allocations, less the capitalized portion of PBOP, are included in Operations and Maintenance expense on the statements of income. Capitalized PBOP amounts relate to employees working on capital projects and are included in Property, Plant and Equipment, Net on the balance sheets. PBOP expense reflected in the statements of cash flows for CL&P, NSTAR Electric, PSNH and WMECO does not include the intercompany allocations or the corresponding capitalized portion, as these amounts are cash settled on a short-term basis.
 
PBOP
 
For the Year Ended December 31, 2016
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
Service Cost
$
12.2

 
$
2.0

 
$
3.0

 
$
1.3

 
$
0.4

Interest Cost
32.9

 
5.3

 
12.2

 
2.9

 
1.1

Expected Return on Plan Assets
(62.9
)
 
(10.1
)
 
(25.7
)
 
(5.5
)
 
(2.4
)
Actuarial Loss
9.0

 
1.5

 
3.2

 
0.7

 
0.1

Prior Service (Credit)/Cost
(9.1
)
 
0.5

 
(7.2
)
 
0.2

 
0.1

Total Net Periodic Benefit Income
$
(17.9
)
 
$
(0.8
)
 
$
(14.5
)
 
$
(0.4
)
 
$
(0.7
)
Intercompany Allocations
N/A

 
$
0.3

 
$
(0.2
)
 
$
(0.1
)
 
$
0.1

Capitalized PBOP Expense/(Income)
$
(8.0
)
 
$
(0.5
)
 
$
(6.4
)
 
$
0.1

 
$
(0.3
)
 
PBOP
 
For the Year Ended December 31, 2015
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
Service Cost
$
16.3

 
$
2.1

 
$
5.4

 
$
1.4

 
$
0.4

Interest Cost
47.2

 
7.2

 
19.0

 
3.9

 
1.5

Expected Return on Plan Assets
(67.4
)
 
(11.1
)
 
(27.3
)
 
(6.0
)
 
(2.5
)
Actuarial Loss
6.8

 
0.7

 
2.3

 
0.5

 
—

Prior Service Credit
(0.5
)
 
—

 
(0.2
)
 
—

 
—

Total Net Periodic Benefit Expense/(Income)
$
2.4

 
$
(1.1
)
 
$
(0.8
)
 
$
(0.2
)
 
$
(0.6
)
Intercompany Allocations
N/A

 
$
1.9

 
$
0.8

 
$
0.4

 
$
0.3

Capitalized PBOP Expense/(Income)
$
0.1

 
$
(0.2
)
 
$
(0.2
)
 
$
0.2

 
$
(0.2
)
 
PBOP
 
For the Year Ended December 31, 2014
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
Service Cost
$
12.5

 
$
2.2

 
$
3.1

 
$
1.3

 
$
0.4

Interest Cost
49.5

 
8.1

 
19.4

 
4.3

 
1.7

Expected Return on Plan Assets
(63.3
)
 
(10.5
)
 
(25.9
)
 
(5.4
)
 
(2.3
)
Actuarial Loss/(Gain)
12.2

 
4.2

 
(0.5
)
 
2.2

 
0.5

Prior Service Credit
(2.8
)
 
—

 
(1.9
)
 
—

 
—

Total Net Periodic Benefit Expense/(Income)
$
8.1

 
$
4.0

 
$
(5.8
)
 
$
2.4

 
$
0.3

Intercompany Allocations
N/A

 
$
3.8

 
$
0.8

 
$
1.0

 
$
0.7

Capitalized PBOP Expense/(Income)
$
1.4

 
$
1.8

 
$
(2.3
)
 
$
0.8

 
$
0.2

As of December 31, 2016 and 2015, the accumulated benefit obligation for the Pension and SERP Plans is as follows:
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
 
WMECO
2016
$
4,829.6

 
$
1,065.2

 
$
904.8

 
$
518.9

 
$
220.0

2015
4,733.2

 
1,062.7

 
888.8

 
506.4

 
222.3


The following actuarial assumptions were used in calculating the Pension and SERP Plans' year end funded status:
Schedule of Assumptions Used
The following actuarial assumptions were used in calculating the Pension and SERP Plans' year end funded status:
 
Pension and SERP
 
As of December 31,
 
 
2016
 
2015
Discount Rate
 
4.01%
—
4.33%
 
4.21%
—
4.60%
Compensation/Progression Rate
 
3.50%
 
3.50%
The following actuarial assumptions were used in calculating the PBOP Plan's year end funded status:
 
PBOP
 
As of December 31,
 
2016
 
2015
Discount Rate
4.21
%
 
4.62
%
Health Care Cost Trend Rate
N/A

 
6.25
%
The following actuarial assumptions were used to calculate PBOP expense amounts:
 
PBOP
 
For the Years Ended December 31,
 
 
2016
 
2015
 
2014
Discount Rate
 
2.88%
—
4.09%
 
4.22%
 
4.78
%
—
5.10
%
Expected Long-Term Rate of Return
 
8.25%
 
8.25%
 
8.25%
The following actuarial assumptions were used to calculate Pension and SERP expense amounts:
 
Pension and SERP
 
For the Years Ended December 31,
 
2016
 
2015
 
2014
Discount Rate
3.27
%
—
4.89
%
 
4.20%
 
4.85
%
—

5.03
%
Expected Long-Term Rate of Return
8.25%
 
8.25%
 
8.25%
Compensation/Progression Rate
3.50%
 
3.50%
 
3.50
%
—

4.00
%
Schedule of Net Benefit Costs
 
Pension and SERP
 
For the Year Ended December 31, 2016
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
Service Cost
$
75.0

 
$
18.8

 
$
13.2

 
$
9.9

 
$
3.1

Interest Cost
185.5

 
41.6

 
33.8

 
20.7

 
8.4

Expected Return on Pension Plan Assets
(317.9
)
 
(72.1
)
 
(67.6
)
 
(38.6
)
 
(17.5
)
Actuarial Loss
125.7

 
25.4

 
34.4

 
9.9

 
5.5

Prior Service Cost
3.6

 
1.5

 
—

 
0.5

 
0.3

Total Net Periodic Benefit Expense/(Income)
$
71.9

 
$
15.2

 
$
13.8

 
$
2.4

 
$
(0.2
)
Intercompany Allocations
N/A

 
$
13.8

 
$
8.9

 
$
4.0

 
$
2.5

Capitalized Pension Expense
$
22.1

 
$
9.3

 
$
7.6

 
$
1.4

 
$
0.4

 
Pension and SERP
 
For the Year Ended December 31, 2015
(Millions of Dollars)
Eversource (1)
 
CL&P
 
NSTAR
Electric
 
PSNH (1)
 
WMECO
Service Cost
$
91.4

 
$
24.7

 
$
14.9

 
$
12.1

 
$
4.3

Interest Cost
227.0

 
51.1

 
40.2

 
24.3

 
10.4

Expected Return on Pension Plan Assets
(335.9
)
 
(78.9
)
 
(70.0
)
 
(40.4
)
 
(18.9
)
Actuarial Loss
148.5

 
32.2

 
35.8

 
11.6

 
6.4

Prior Service Cost/(Credit)
3.7

 
1.5

 
(0.1
)
 
0.5

 
0.3

Total Net Periodic Benefit Expense
$
134.7

 
$
30.6

 
$
20.8

 
$
8.1

 
$
2.5

Intercompany Allocations
N/A

 
$
22.5

 
$
13.6

 
$
6.7

 
$
4.4

Capitalized Pension Expense
$
41.0

 
$
18.8

 
$
11.4

 
$
3.5

 
$
1.9

 
Pension and SERP
 
For the Year Ended December 31, 2014
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR
Electric 
 
PSNH
 
WMECO
Service Cost
$
79.9

 
$
20.2

 
$
13.6

 
$
9.7

 
$
3.5

Interest Cost
225.7

 
50.5

 
41.3

 
23.8

 
10.3

Expected Return on Pension Plan Assets
(310.8
)
 
(75.4
)
 
(63.0
)
 
(38.1
)
 
(17.9
)
Actuarial Loss
128.4

 
33.7

 
23.5

 
11.6

 
6.9

Prior Service Cost
4.4

 
1.8

 
—

 
0.7

 
0.4

Total Net Periodic Benefit Expense
$
127.6

 
$
30.8

 
$
15.4

 
$
7.7

 
$
3.2

Intercompany Allocations
N/A

 
$
26.7

 
$
10.4

 
$
7.6

 
$
5.1

Capitalized Pension Expense
$
35.2

 
$
17.6

 
$
7.9

 
$
3.0

 
$
2.4


(1)  
Amounts exclude $3.2 million for the year ended December 31, 2015 that represent amounts included in other deferred debits.
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
The following is a summary of the changes in plan assets and benefit obligations recognized in Regulatory Assets and Other Comprehensive Income ("OCI") as well as amounts in Regulatory Assets and OCI that were reclassified as net periodic benefit expense during the years presented:
 
Regulatory Assets
 
OCI
 
For the Years Ended December 31,
(Millions of Dollars)
2016
 
2015
 
2016
 
2015
Actuarial Losses/(Gains) Arising During the Year
$
184.6

 
$
(2.0
)
 
$
6.8

 
$
(6.2
)
Actuarial Losses Reclassified as Net Periodic Benefit Expense
(119.9
)
 
(142.3
)
 
(5.8
)
 
(6.2
)
Prior Service Cost Arising During the Year
7.1

 
—

 
1.9

 
—

Prior Service Cost Reclassified as Net Periodic Benefit Expense
(3.4
)
 
(3.5
)
 
(0.2
)
 
(0.2
)

The following is a summary of the remaining Regulatory Assets and Accumulated Other Comprehensive Loss amounts that have not been recognized as components of net periodic benefit expense as of December 31, 2016 and 2015, as well as the amounts that are expected to be recognized as components in 2017:
 
Regulatory Assets as of December 31,
 
Expected 2017 Expense
 
AOCL as of December 31,
 
Expected 2017 Expense
(Millions of Dollars)
2016
 
2015
 
 
2016
 
2015
 
Actuarial Loss
$
1,732.3

 
$
1,667.6

 
$
128.5

 
$
82.1

 
$
81.1

 
$
5.8

Prior Service Cost
13.4

 
9.7

 
4.1

 
2.3

 
0.6

 
0.2

The following is a summary of the changes in plan assets and benefit obligations recognized in Regulatory Assets and OCI as well as amounts recognized in Regulatory Assets and OCI that were reclassified as net periodic benefit (expense)/income during the years presented:
 
Regulatory Assets
 
OCI
 
For the Years Ended December 31,
(Millions of Dollars)
2016
 
2015
 
2016
 
2015
Actuarial Losses/(Gains) Arising During the Year
$
32.4

 
$
(34.1
)
 
$
(2.0
)
 
$
0.7

Actuarial (Losses)/Gains Reclassified as Net Periodic Benefit (Expense)/Income
(9.2
)
 
(6.4
)
 
0.2

 
(0.4
)
Prior Service (Credit)/Cost Arising During the Year
(247.9
)
 
—

 
4.0

 
—

Prior Service Credit/(Cost) Reclassified as Net Periodic Benefit Income/(Expense)
9.7

 
0.5

 
(0.6
)
 
—


The following is a summary of the remaining Regulatory Assets and Accumulated Other Comprehensive Loss amounts that have not been recognized as components of net periodic benefit expense as of December 31, 2016 and 2015, as well as the amounts that are expected to be recognized as components in 2017:
 
Regulatory Assets as of December 31,
 
Expected 2017 Expense
 
AOCL as of December 31,
 
Expected 2017 Expense
(Millions of Dollars)
2016
 
2015
 
 
2016
 
2015
 
Actuarial Loss
$
175.4

 
$
152.2

 
$
7.9

 
$
4.5

 
$
6.3

 
$
0.4

Prior Service (Credit)/Cost
(239.5
)
 
(1.3
)
 
(21.7
)
 
3.4

 
—

 
0.2
Schedule of Expected Benefit Payments
The following benefit payments, which reflect expected future service, are expected to be paid by the Pension, SERP and PBOP Plans:
(Millions of Dollars)
2017
 
2018
 
2019
 
2020
 
2021
 
2022-2026
Pension and SERP
$
284.5

 
$
277.0

 
$
284.3

 
$
290.4

 
$
298.9

 
$
1,562.9

PBOP
54.8

 
55.0

 
55.1

 
55.4

 
55.4

 
270.7
Schedule of Allocation of Plan Assets
The following table presents, by asset category, the Pension and PBOP Plan assets recorded at fair value on a recurring basis by the level in which they are classified within the fair value hierarchy:  
  
Pension Plan
  
Fair Value Measurements as of December 31,
(Millions of Dollars)
2016
 
2015
Asset Category:
Level 1
 
Level 2
 
Uncategorized
 
Total
 
Level 1
 
Level 2
 
Uncategorized
 
Total
Equity Securities (1)
$
455.5

 
$
—

 
$
1,279.7

 
$
1,735.2

 
$
396.5

 
$
62.2

 
$
1,228.7

 
$
1,687.4

Private Equity  
6.0

 
—

 
518.4

 
524.4

 
7.6

 
—

 
464.7

 
472.3

Fixed Income (2)
—

 
183.0

 
1,099.4

 
1,282.4

 
—

 
208.6

 
1,008.2

 
1,216.8

Real Estate and Other Assets
77.2

 
—

 
325.9

 
403.1

 
—

 
85.9

 
291.9

 
377.8

Hedge Funds
—

 
—

 
335.0

 
335.0

 
—

 
—

 
340.5

 
340.5

Total
$
538.7

 
$
183.0

 
$
3,558.4

 
$
4,280.1

 
$
404.1

 
$
356.7

 
$
3,334.0

 
$
4,094.8

Less:  401(h) PBOP Assets (3)
 
 
 
 
 
 
(204.1
)
 
 
 
 
 
 
 
(189.4
)
Total Pension Assets
 
 
 
 
 
 
$
4,076.0

 
 
 
 
 
 
 
$
3,905.4

  
PBOP Plan
  
Fair Value Measurements as of December 31,
(Millions of Dollars)
2016
 
2015
Asset Category:
Level 1
 
Level 2
 
Uncategorized
 
Total
 
Level 1
 
Level 2
 
Uncategorized
 
Total
Equity Securities (1)
$
88.6

 
$
—

 
$
214.1

 
$
302.7

 
$
109.7

 
$
—

 
$
199.4

 
$
309.1

Private Equity
—

 
—

 
32.2

 
32.2

 
—

 
—

 
32.9

 
32.9

Fixed Income (2)
9.5

 
44.8

 
132.3

 
186.6

 
9.7

 
50.5

 
131.0

 
191.2

Real Estate and Other Assets
15.5

 
—

 
27.5

 
43.0

 
—

 
6.6

 
30.8

 
37.4

Hedge Funds
—

 
—

 
47.2

 
47.2

 
—

 
—

 
52.2

 
52.2

Total
$
113.6

 
$
44.8

 
$
453.3

 
$
611.7

 
$
119.4

 
$
57.1

 
$
446.3

 
$
622.8

Add:  401(h) PBOP Assets (3)
 
 
 
 
 
 
204.1

 
 
 
 
 
 
 
189.4

Total PBOP Assets
 
 
 
 
 
 
$
815.8

 
 
 
 
 
 
 
$
812.2


(1)  
United States, International and Emerging Markets equity securities that are uncategorized include investments in commingled funds and hedge funds that are overlayed with equity index swaps and futures contracts.

(2)
Fixed Income investments that are uncategorized include fixed income funds that invest in a variety of opportunistic fixed income strategies, and hedge funds that are overlayed with fixed income futures.  

(3)  
The assets of the Pension Plan include a 401(h) account that has been allocated to provide health and welfare postretirement benefits under the PBOP Plan.

 These long-term rates of return are based on the assumed rates of return for the target asset allocations as follows:
 
As of December 31, 2016 and 2015
 
Pension Plan and Tax-Exempt Assets Within PBOP Plan
 
Target Asset Allocation
 
Assumed Rate of Return
Equity Securities:
 
 
 
United States
22.0
%
 
8.5
%
International
13.0
%
 
8.5
%
Emerging Markets
5.0
%
 
10.0
%
Private Equity
12.0
%
 
12.0
%
Debt Securities:
 
 
 
Fixed Income
12.0
%
 
4.5
%
High Yield Fixed Income
13.0
%
 
8.5
%
Emerging Markets Debt
5.0
%
 
7.5
%
Real Estate and Other Assets
10.0
%
 
7.5
%
Hedge Funds
8.0
%
 
7.0
%
Schedule of Defined Contribution Plans
The total defined Eversource 401k Plan employer matching contributions, including the K-Vantage contributions, were as follows:
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
2016
$
31.8

 
$
4.5

 
$
7.0

 
$
3.4

 
$
1.1

2015
30.4

 
4.8

 
6.3

 
3.4

 
1.0

2014
29.7

 
5.0

 
6.3

 
3.2

 
1.0
Schedule of Other Retirement Benefits
The actuarially-determined liability for these benefits, which is included in Other Long-Term Liabilities on the balance sheets, as well as the related expense included in Operations and Maintenance Expense on the income statements, are as follows:
Eversource
(Millions of Dollars)
As of and For the Years Ended December 31,
2016
 
2015
 
2014
Actuarially-Determined Liability
$
54.2

 
$
55.2

 
$
57.5

Other Retirement Benefits Expense
2.9

 
3.9

 
4.5

 
As of and For the Years Ended December 31,
 
2016
 
2015
 
2014
(Millions of Dollars)
CL&P
 
NSTAR Electric
 
PSNH
 
WMECO
 
CL&P
 
NSTAR Electric
 
PSNH
 
WMECO
 
CL&P
 
NSTAR Electric
 
PSNH
 
WMECO
Actuarially-Determined Liability
$
0.3

 
$
—

 
$
2.0

 
$
0.1

 
$
0.4

 
$
—

 
$
2.4

 
$
0.2

 
$
0.4

 
$
—

 
$
2.6

 
$
0.2

Other Retirement Benefits Expense
1.1

 
0.7

 
0.6

 
0.2

 
1.5

 
1.0

 
0.7

 
0.3

 
2.1

 
0.3

 
0.9

 
0.4