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Pension Plans (Tables)
 3 Months Ended
Mar. 29, 2019
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
 
March 29, 2019
 
March 30, 2018
U.S. Pension Benefits:
 
 
 
Interest cost
$
0.4

 
$
0.3

Expected return on plan assets
(0.3
)
 
(0.4
)
Net periodic pension cost
$
0.1

 
$
(0.1
)
 
 
 
 
Non-U.S. Pension Benefits:
 
 
 
Service cost
$
0.3

 
$
0.3

Interest cost
1.4

 
1.4

Expected return on plan assets
(1.4
)
 
(1.5
)
Amortization of net loss
0.7

 
0.7

Net curtailment and settlement loss recognized
—

 
0.2

Net periodic pension cost
$
1.0

 
$
1.1