Pension and Other Post Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017
Pension And Other Post Retirement Benefits Textuals [Abstract]
Defined Benefit Plan Estimated Future Employer Contributions Remainder Of Year			$ 7.4
Expected UK Pension Plan Contribution For The Year			1.8
Other Postretirement Benefits Plan [Member]
Pension and Other Post-Retirement Benefits
Service cost	$ 0.3	$ 0.3	0.8	$ 0.9
Interest cost	0.3	0.3	0.8	0.9
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(0.2)	(0.2)	(0.7)	(0.7)
Amortization of net loss	(0.6)	(0.5)	(1.7)	(1.6)
Net periodic pension income	(0.2)	(0.1)	(0.8)	(0.5)
Defined Benefit Plans [Member]
Pension and Other Post-Retirement Benefits
Service cost	0.2	0.2	0.6	0.7
Interest cost	9.2	9.4	27.4	28.3
Expected return on plan assets	(17.4)	(18.2)	(52.3)	(54.6)
Amortization of net loss	0.0	0.1	0.0	0.1
Net periodic pension income	$ (8.0)	$ (8.5)	$ (24.3)	$ (25.5)