Derivative Instruments and Hedging Activities - Non-designated Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized against Earnings				$ (5.9)
Non-designated derivatives:
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized against Earnings	$ 12.0	$ (5.7)	$ 7.9	(15.0)
Foreign currency forward contracts | Other expense, net | Non-designated derivatives:
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized against Earnings	11.8	(5.0)	8.6	(13.9)
Foreign currency forward contracts | Interest expense, net | Non-designated derivatives:
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized against Earnings	$ 0.2	$ (0.7)	$ (0.7)	$ (1.1)