Pension Plans (Tables)

3 Months Ended

Mar. 30, 2018

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 our noncontributory defined benefit pension plans ($ in millions):

	Three Months Ended
	March 30, 2018			March 31, 2017
U.S. Pension Benefits:
Interest cost	$	0.3		$	—
Expected return on plan assets	(0.4		)	—
Net periodic pension cost	$	(0.1	)	$	—
Non-U.S. Pension Benefits:
Service cost	$	0.5		$	1.0
Interest cost	1.5			1.4
Expected return on plan assets	(1.9		)	(1.8		)
Amortization of net loss	0.9			1.1
Net periodic pension cost	$	1.0		$	1.7