Defined Benefit Plans (Components of Net Periodic Benefit Cost of Defined Benefit Pension Pans) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ (10.9)	$ (9.8)
Net periodic benefit cost	(3.1)	(2.9)
Defined benefit pension plans | U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	(2.1)	(1.9)
Interest cost	(20.2)	(21.0)
Expected return on plan assets	(33.1)	(32.9)
Amortization of actuarial loss	7.8	6.6
Amortization of prior service credit	(0.3)	0.0
Net periodic benefit cost	2.7	3.4
Defined benefit pension plans | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	(8.7)	(7.7)
Interest cost	(6.7)	(6.3)
Expected return on plan assets	(12.1)	(10.2)
Amortization of actuarial loss	1.5	1.9
Amortization of prior service credit	0.1	0.1
Settlement loss recognized	(0.4)	0.0
Net periodic benefit cost	$ (5.1)	$ (5.6)