Pension and Other Post Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 02, 2020	Mar. 28, 2019
Pension And Other Post Retirement Benefits Textuals [Abstract]
Defined Benefit Plan Estimated Future Employer Contributions Remainder Of Year	$ 9.4
Expected UK Pension Plan Contribution For The Year	1.8
Defined Benefit Plans [Member]
Pension [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	116.8
Pension and Other Post-Retirement Benefits
Service cost	(0.2)	$ (0.3)
Interest cost	(8.0)	(10.1)
Expected return on plan assets	(17.3)	(16.7)
Amortization of net loss	0.0	0.4
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits	24.7	0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	33.0	0.0
Net periodic pension income	48.6	(5.9)
Other Benefits [Member]
Pension [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	(4.3)
Pension and Other Post-Retirement Benefits
Service cost	(0.3)	(0.2)
Interest cost	(0.2)	(0.3)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(0.2)	(0.2)
Amortization of net loss	(0.5)	(0.6)
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits	11.8	0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	(0.3)	0.0
Net periodic pension income	$ 11.3	$ (0.3)