

13.	Retirement Plans

The net periodic benefit cost for the Company's defined benefit pension plans was as follows:



	Three Months Ended				Six Months Ended
	June 29, 2018		June 30, 2017		June 29, 2018		June 30, 2017
Service cost	$	—	$	0.2	$	0.1	$	1.3
Interest cost	0.1		0.4		0.3		1.6
Expected return on plan assets	—		—		—		(0.8		)
Amortization of net actuarial loss	0.2		0.3		0.3		1.8
Amortization of prior service cost	0.1		0.1		0.1		0.2
Plan settlements	—		0.5		—		69.7
Net periodic benefit cost	$	0.4	$	1.5	$	0.8	$	73.8

The net periodic benefit credit for the Company's postretirement benefit plans was approximately $0.7 million and zero for the three months ended June 29, 2018 and June 30, 2017, respectively, and $1.0 million and zero for the six months ended June 29, 2018 and June 30, 2017, respectively.

Of the net periodic benefit cost for the Company's defined benefit pension plans and postretirement benefit plans, only service costs are included within other employee compensation costs recorded within cost of sales, R&D, and SG&A expenses, while all other components of the net periodic benefit costs are included within other income and expense on the unaudited condensed consolidated statements of income.

Pension Plan Termination

During the six months ended June 30, 2017, the Company completed the third-party settlement of the remaining obligations of six defined benefit pension plans that were terminated during fiscal 2016. In conjunction with this final settlement, the Company made a $61.3 million cash contribution to the terminated plans and recognized a $69.7 million charge, included within other (expense) income expense, net within the unaudited condensed consolidated statement of income.