Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization	$ 0.4	$ (0.3)
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	2.1	1.9
Interest cost	1.1	1.5
Expected return on plan assets	(1.0)	(1.1)
Net amortization	0.7	0.0
Net periodic benefit cost	2.9	2.3
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
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	$ 0.6	$ 0.2