Pension And Other Benefit Plans - (Components of Net Periodic Benefit Cost of Defined Benefit Pension Pans) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ (2.6)	$ (2.2)	$ (7.8)	$ (6.8)
Net periodic pension cost	(2.4)	(2.0)	(7.4)	(5.2)
Defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	(2.6)	(2.2)	(7.8)	(6.8)
Interest cost	(0.5)	(0.5)	(1.3)	(1.6)
Expected return on plan assets	1.0	0.7	2.8	2.3
Amortization of initial net obligation	0.0	0.0	(0.2)	(0.1)
Amortization of prior service credit	0.1	0.1	0.3	0.1
Amortization of actuarial loss	(0.5)	(0.1)	(1.3)	(0.3)
Curtailment and settlement gains recognized	0.1	0.0	0.1	1.2
Net periodic pension cost	$ (2.4)	$ (2.0)	$ (7.4)	$ (5.2)