Defined 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	$ (11.0)	$ (7.7)	$ (28.0)	$ (22.7)
Net periodic benefit (cost)	(7.6)	(3.5)	(14.2)	(8.4)
Defined benefit pension plans | U.S. pension benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	(1.6)	0.0	(4.8)
Interest cost	(17.3)	(22.1)	(51.2)	(66.5)
Expected return on plan assets	30.1	31.0	89.7	94.2
Amortization of actuarial loss	(9.5)	(6.7)	(27.6)	(19.1)
Amortization of prior service credit	(0.2)	(0.2)	(0.7)	(0.7)
Net periodic benefit (cost)	3.1	0.4	10.2	3.1
Defined benefit pension plans | Non-U.S. pension benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	(10.9)	(6.0)	(27.7)	(17.6)
Interest cost	(6.0)	(6.1)	(16.2)	(18.4)
Expected return on plan assets	9.1	10.0	26.9	30.2
Amortization of actuarial loss	(2.4)	(1.1)	(7.1)	(3.3)
Amortization of prior service credit	0.2	0.0	0.8	0.1
Curtailment gain recognized	0.0	0.0	0.4	0.0
Settlement gain recognized	0.0	0.1	0.0	0.0
Net periodic benefit (cost)	$ (10.0)	$ (3.1)	$ (22.9)	$ (9.0)