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Pension Plans (Tables)
 9 Months Ended
Sep. 28, 2018
Retirement Benefits [Abstract]  
Schedule of Net Periodic Pension Costs The following sets forth the components of our net periodic pension costs associated with our noncontributory defined benefit pension plans ($ in millions):
 
Three Months Ended
 
Nine Months Ended
 
September 28, 2018
 
September 29, 2017
 
September 28, 2018
 
September 29, 2017
U.S. Pension Benefits:
 
 
 
 
 
 
 
Interest cost
$
0.3

 
$
—

 
$
0.9

 
$
—

Expected return on plan assets
(0.4
)
 
—

 
(1.1
)
 
—

Net periodic pension cost
$
(0.1
)
 
$
—

 
$
(0.2
)
 
$
—

 
 
 
 
 
 
 
 
Non-U.S. Pension Benefits:
 
 
 
 
 
 
 
Service cost
$
0.5

 
$
1.1

 
$
1.4

 
$
3.1

Interest cost
1.4

 
1.5

 
4.4

 
4.4

Expected return on plan assets
(1.8
)
 
(1.9
)
 
(5.5
)
 
(5.5
)
Amortization of net loss
0.9

 
1.2

 
2.7

 
3.4

Net curtailment and settlement loss recognized
0.3

 
—

 
0.9

 
—

Net periodic pension cost
$
1.3

 
$
1.9

 
$
3.9

 
$
5.4