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EMPLOYEE BENEFIT PLANS
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
EMPLOYEE BENEFIT PLANS
Employee Benefit Plans

Defined Benefit Plans

The following table shows the components of net periodic benefit cost (including amounts capitalized to our balance sheets) for our benefit plans:
 
 
Pension Benefits
 
Other Postretirement Benefits
 
 
Three Months Ended June 30
 
Six Months Ended June 30
 
Three Months Ended June 30
 
Six Months Ended June 30
(Millions)
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
 
$
7.1

 
$
5.9

 
$
14.7

 
$
12.5

 
$
5.4

 
$
4.8

 
$
11.2

 
$
10.7

Interest cost
 
16.7

 
19.3

 
33.7

 
39.0

 
5.1

 
5.2

 
10.4

 
12.3

Expected return on plan assets
 
(25.8
)
 
(28.5
)
 
(52.7
)
 
(57.4
)
 
(7.9
)
 
(7.9
)
 
(15.8
)
 
(16.7
)
Loss on plan settlement
 
0.7

 
0.9

 
1.2

 
0.9

 
—

 
—

 
—

 
—

Amortization of prior service cost (credit)
 
—

 
0.1

 
0.1

 
0.3

 
(2.5
)
 
(2.8
)
 
(5.1
)
 
(4.1
)
Amortization of net actuarial loss
 
12.1

 
8.6

 
22.6

 
17.0

 
0.8

 
0.8

 
1.9

 
1.5

Net periodic benefit cost
 
$
10.8

 
$
6.3

 
$
19.6

 
$
12.3

 
$
0.9

 
$
0.1

 
$
2.6

 
$
3.7



Prior service costs (credits) and net actuarial losses that have not yet been recognized as a component of net periodic benefit cost are recorded in accumulated other comprehensive income for our nonregulated entities and as net regulatory assets or liabilities for our regulated utilities.

In March 2014, we remeasured the obligations of certain other postretirement benefit plans as a result of a plan design change to move participants age 65 and older to a Medicare Advantage plan starting January 1, 2015.
 
Rabbi Trust Funding Requirement

The Agreement and Plan of Merger entered into with Wisconsin Energy Corporation in June 2014 triggered the potential change in control provisions in the rabbi trust agreement. These provisions required the full funding of the present value of each participant's total benefit under the deferred compensation program and certain nonqualified pension plans. In 2015, a portion of the amounts contributed to the rabbi trust in 2014 and 2015 were used to fund participant's benefits under the deferred compensation program and certain nonqualified pension plans. See Note 2, WEC Merger, for more information on the merger.