DEFINED BENEFIT PENSION PLANS

The following table sets forth the net periodic pension cost for our defined benefit pension and postretirement plans during the quarter ended March 31, 2018 and 2017. In accordance with ASU 2017-07, "Retirement Benefits - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost" (an amendment to ASC 715), all non-service related costs associated with our pension and post retirement plans are recorded outside of operating income. The net periodic pension cost included the following components:



	Quarter Ended March 31,
Dollar amounts in millions	2018			2017
Service cost	$	1.1		$	1.4
Other components of net periodic pension cost:
Interest cost	2.9			3.2
Expected return on plan assets	(3.4		)	(3.3		)
Amortization of prior service cost ¹	0.1			0.2
Amortization of net loss ¹	1.6			1.4
Net periodic pension cost	$	2.3		$	2.9

Net periodic pension cost included in cost of sales	$	0.7		$	0.9
Net periodic pension cost included in selling, general, and administrative expenses	0.4			0.4
Net periodic pension cost included in other non-operating items	1.2			1.6
	$	2.3		$	2.9

¹The amortization of prior service costs and net loss are included in the amounts reclassified from accumulated other comprehensive income (loss). See Note 16 for additional details.

During the three months ended March 31, 2018, we made $0.7 million in pension contributions to our defined benefit pension plans. We expect to contribute between $10.0 million and $12.0 million to our defined benefit pension plans in the remaining months of 2018.