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Pension Plans (Tables)
 9 Months Ended
Sep. 29, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Periodic Pension Costs
The following sets forth the components of our net periodic pension costs associated with these plans ($ in millions):
 
Three Months Ended
 
Nine Months Ended
 
September 29, 2017
 
September 30, 2016
 
September 29, 2017
 
September 30, 2016
Service cost
$
1.1

 
$
0.9

 
$
3.1

 
$
2.6

Interest cost
1.5

 
1.8

 
4.4

 
5.6

Expected return on plan assets
(1.9
)
 
(2.0
)
 
(5.5
)
 
(6.1
)
Amortization of net loss
1.2

 
1.3

 
3.4

 
4.1

Net periodic pension cost
$
1.9

 
$
2.0

 
$
5.4

 
$
6.2