Defined Benefit Plans (Components of Net Periodic Benefit Cost of Defined Benefit Pension Pans) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost	$ (2.0)	$ (1.1)	$ (5.2)	$ (5.6)
Defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	(2.2)	(2.6)	(6.8)	(7.5)
Interest cost	(0.5)	(0.5)	(1.6)	(1.5)
Expected return on plan assets	0.7	1.0	2.3	2.9
Amortization of initial net obligation	0.0	(0.1)	(0.1)	(0.2)
Amortization of prior service credit	0.1	0.1	0.1	0.1
Amortization of net loss	(0.1)	(0.2)	(0.3)	(0.6)
Curtailment and settlement gains recognized	0.0	1.2	1.2	1.2
Net periodic pension cost	$ (2.0)	$ (1.1)	$ (5.2)	$ (5.6)