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Employee Benefit Plans and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plans and Other Postretirement Benefits
Employee Benefit Plans and Other Postretirement Benefits

The components of net periodic benefit cost were as follows (dollars in millions):
 
Pension Plans
 
Postretirement Plans
 
Three Months Ended
March 31
 
Three Months Ended
March 31
 
2015
 
2014
 
2015
 
2014
Service cost
$
5.9

 
$
5.8

 
$
0.4

 
$
0.4

Interest cost
11.5

 
11.4

 
0.3

 
0.3

Expected return on plan assets
(13.3
)
 
(12.7
)
 
—

 
—

Net amortization of unrecognized amounts
 
 
 
 
 
 
 
Prior service cost
1.4

 
1.6

 
—

 
—

Actuarial loss
2.1

 
0.2

 
0.1

 
—

Net periodic benefit cost
$
7.6

 
$
6.3

 
$
0.8

 
$
0.7



PCA makes pension plan contributions that are sufficient to fund its actuarially determined costs, generally equal to the minimum amounts required by the Employee Retirement Income Security Act (ERISA). During the three months ended March 31, 2015, we made payments of $0.4 million to our nonqualified pension plans. We have no required minimum qualified contributions in 2015.