Employee Benefit Plans and Other Postretirement Benefits

3 Months Ended

Mar. 31, 2020

Compensation And Retirement Disclosure [Abstract]

Employee Benefit Plans and Other Postretirement Benefits

13. 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,
	2020			2019
Service cost	$	5.9		$	6.2
Interest cost		10.0			11.7
Expected return on plan assets		(14.2	)		(13.0	)
Net amortization of unrecognized amounts
Prior service cost		1.1			1.6
Actuarial loss		2.7			1.7
Net periodic benefit cost	$	5.5		$	8.2

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. During the three months ended March 31, 2020 and 2019, payments to our nonqualified pension plans were insignificant. For the three months ended March 31, 2020 and 2019, we made contributions of $3.9 million and $0.7 million, respectively, to our qualified pension plans. We expect to contribute at least the estimated required minimum contributions to our qualified plans of approximately $19.8 million in 2020.

For the three months ended March 31, 2020 and 2019, the net periodic benefit cost for our postretirement plans was insignificant.