Employee Benefit Plans and Other Postretirement Benefits

9 Months Ended

Sep. 30, 2015

Compensation and Retirement Disclosure [Abstract]

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 September 30						Nine Months Ended September 30
	2015			2014			2015			2014
Service cost	$	6.1		$	5.8		$	17.9		$	17.4
Interest cost	11.6			11.5			34.6			34.4
Expected return on plan assets	(13.3		)	(12.7		)	(39.8		)	(38.0		)
Net amortization of unrecognized amounts
Prior service cost	1.4			1.6			4.2			4.9
Actuarial loss	2.1			0.2			6.4			0.4
Net periodic benefit cost	$	7.9		$	6.4		$	23.3		$	19.1

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). During the nine months ended September 30, 2015, we made payments of $0.8 million to our nonqualified pension plans. We have no required minimum qualified contributions in 2015.

The components of net periodic benefit cost for our postretirement plans were as follows (dollars in millions):



	Postretirement Plans
	Three Months Ended September 30				Nine Months Ended September 30
	2015		2014		2015		2014
Service cost	$	0.4	$	0.4	$	1.3	$	1.2
Interest cost	0.3		0.3		0.9		0.9
Net amortization of unrecognized amounts
Prior service cost	—		—		—		(0.1		)
Actuarial loss	—		—		0.1		0.1
Net periodic benefit cost	$	0.7	$	0.7	$	2.3	$	2.1