Reporting Segment And Geographic Information (Reconciliation Of The Company's Consolidated Segment Operating Income To Consolidated Income Before Income Taxes) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 28, 2018	Dec. 29, 2017		Dec. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Unallocated Corporate Expenses		$ (1,360.3)	$ (1,141.9)	[1]	$ (1,054.1)	[1]
Acquired deferred revenue adjustment		(23.6)	(2.8)		(2.6)
Restructuring Charges	[2]	(8.7)	(10.5)		(13.3)
Amortization of purchased intangible assets		(179.6)	(148.8)	[1]	(150.8)	[1]
Stock-based Compensation		(76.9)	(64.8)	[1]	(52.6)	[1]
Amortization of acquisition-related inventory set-up		(0.2)	(2.8)		0.0
Acquisition and divestiture items		(38.9)	(7.4)		(6.8)
Executive Transition Costs					(1.0)
Amortization of acquired capitalized commissions		4.7	1.3		1.6
Consolidated Operating income		320.7	235.7	[1]	180.4	[1]
Non-operating income (expense), net		(42.7)	12.5	[1]	(4.3)	[1]
Consolidated Income Before Taxes		278.0	248.2	[1]	176.1	[1]
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating income		734.6	558.3		476.4
Corporate, Non-Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Unallocated Corporate Expenses	[3]	$ (90.7)	$ (86.8)		$ (70.5)

[1] See Note 2 for a summary of adjustments

[2] Restructuring charges primarily consist of severance and benefits, resulting from employee headcount reductions in connection with the Company's restructuring programs related to decisions to streamline processes and reduce the cost structure. As of the end of fiscal 2018, the Company's restructuring liability was $3.0 million, which is expected to be settled in fiscal 2019. Restructuring liabilities are reported within Other current liabilities on the Consolidated Balance Sheets.

[3] Unallocated corporate expense includes general corporate expense.