Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization	$ (0.3)	$ (0.2)
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.9	2.6
Interest cost	1.5	1.4
Expected return on plan assets	(1.1)	(1.1)
Settlements and Curtailments	0.0	0.1
Net amortization	0.0	0.0
Net periodic benefit cost	2.3	3.0
Post-retirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0
Interest cost	0.1	0.1
Expected return on plan assets	0.0	0.0
Settlements and Curtailments	0.0	0.0
Net amortization	(0.3)	(0.3)
Net periodic benefit cost	(0.2)	(0.2)
Other Nonoperating Income (Expense) [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ 0.2	$ 0.2