Employee Benefit Plans and Other Postretirement Benefits

3 Months Ended

Mar. 31, 2025

Retirement Benefits [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,
	2025			2024
Service cost	$	2.6		$	3.1
Interest cost		14.3			13.9
Expected return on plan assets		(15.6	)		(16.5	)
Net amortization of unrecognized amounts
Prior service cost		1.4			1.4
Actuarial loss		—			0.2
Net periodic benefit cost	$	2.7		$	2.1

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 both the three months ended March 31, 2025 and 2024, payments to our nonqualified pension plans were insignificant. During both the three months ended March 31, 2025 and 2024, we did not make any contributions to our qualified pension plans. We do not have a required minimum contribution amount established for 2025.

For both the three months ended March 31, 2025 and 2024, the net periodic benefit cost for our postretirement plans was insignificant.