Deferred Revenue And Performance Obligations - Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018
Revenue Recognition and Deferred Revenue [Abstract]
Beginning balance of the period	$ 452.4	$ 356.2	$ 387.2	$ 276.6
Revenue recognized	(76.7)	(41.5)	(300.5)	(201.7)
Acquired deferred revenue	1.5	26.6	1.5	50.3
Net deferred revenue activity	41.8	23.0	330.8	239.1
Ending balance of the period	$ 419.0	$ 364.3	$ 419.0	$ 364.3