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Employee Benefit Plans and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2017
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 for our pension plans were as follows (dollars in millions):
 
Pension Plans
 
 
Three Months Ended March 31
 
 
2017
 
2016
 
Service cost
$
6.1

 
$
6.1

 
Interest cost
10.4

 
10.2

 
Expected return on plan assets
(13.5
)
 
(12.4
)
 
Net amortization of unrecognized amounts
 
 
 
 
Prior service cost
1.5

 
1.4

 
Actuarial loss
1.9

 
1.4

 
Net periodic benefit cost
$
6.4

 
$
6.7

 


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). From time to time, PCA may make additional discretionary contributions based on the funded status of the plans, tax deductibility, income from operations, and other factors. For the three months ended March 31, 2017, we made contributions of $3.7 million to our qualified pension plans. We did not make contributions to our qualified plans during the three months ended March 31, 2016. We expect to contribute at least the estimated required minimum contributions to our qualified plans of approximately $8.0 million in 2017.

The components of net periodic benefit cost for our postretirement plans were as follows (dollars in millions):
 
Postretirement Plans
 
 
Three Months Ended March 31
 
 
2017
 
2016
 
Service cost
$
0.1

 
$
0.2

 
Interest cost
0.1

 
0.2

 
Amortization of actuarial (income) loss
—

 
(0.2
)
 
Net periodic benefit cost
$
0.2

 
$
0.2