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Retirement Plans
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Retirement Plans
12.
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 30,
2017
 
June 24,
2016
 
June 30,
2017
 
June 24,
2016
Service cost
$
0.2


$
0.4

 
$
1.5

 
$
0.8

Interest cost
0.4


3.5

 
2.1

 
7.0

Expected return on plan assets
—


(4.2
)
 
(1.3
)
 
(8.4
)
Amortization of net actuarial loss
0.4


2.6

 
2.6

 
5.2

Amortization of prior service cost
0.1

 
—

 
0.2

 
—

Plan settlements
0.5

 
3.3

 
69.7

 
7.0

Net periodic benefit cost
$
1.6


$
5.6

 
$
74.8

 
$
11.6



The net periodic benefit credit for the Company's postretirement benefit plans was approximately zero for the three months ended June 30, 2017 and June 24, 2016, and for the six months ended June 30, 2017 and June 24, 2016 was approximately zero and $0.1 million, respectively.

Net periodic benefit cost for the Company's defined benefit pension plans and postretirement benefit plans was included within cost of sales; research and development; and selling, general and administrative ("SG&A") expenses 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 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 SG&A expenses.