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Retirement Plans
 9 Months Ended
Sep. 28, 2018
Retirement Benefits [Abstract]  
Retirement Plans
13.
Retirement Plans
The net periodic benefit (credit) cost for the Company's defined benefit pension plans was as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 28,
2018
 
September 29,
2017
 
September 28,
2018
 
September 29,
2017
Service cost
$
0.1

 
$
—

 
$
0.2

 
$
1.3

Interest cost
0.2

 
0.1

 
0.5

 
1.7

Expected return on plan assets
—

 
—

 
—

 
(0.8
)
Amortization of net actuarial loss
0.1

 
—

 
0.4

 
1.8

Amortization of prior service cost
—

 
—

 
0.1

 
0.2

Plan settlements
(3.4
)
 
—

 
(3.4
)
 
69.7

Net periodic benefit (credit) cost
$
(3.0
)
 
$
0.1

 
$
(2.2
)
 
$
73.9



The net periodic benefit credit for the Company's postretirement benefit plans was approximately $0.1 million and zero for the three months ended September 28, 2018 and September 29, 2017, respectively, and $1.1 million and zero for the nine months ended September 28, 2018 and September 29, 2017, respectively.

Of the net periodic benefit (credit) 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 nine months ended September 29, 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, recorded as other income (expense), net within the unaudited condensed consolidated statement of income. During the three months ended September 28, 2018, the Company received a refund of $3.4 million of the initial cash contribution, recorded as other income (expense), net within the unaudited condensed consolidated statement of income.