Reporting Segment And Geographic Information (Schedule Of Revenue From Customers) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Dec. 29, 2017		Dec. 30, 2016		Jan. 01, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues		$ 708.4	$ 670.0	$ 661.9	$ 613.9	$ 585.5	$ 584.1	$ 609.6	$ 583.0	$ 2,654.2	[1]	$ 2,362.2	[1]	$ 2,290.4	[1]
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1]									1,285.7		1,156.0		1,142.1
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1]									677.1		574.9		557.2
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1]									378.3		352.6		321.1
Other Non-US Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1]									313.1		278.7		270.0
Ten Percent Customer member [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues										$ 0.0		$ 0.0		$ 0.0
Ten Percent Customer member [Member] | Sales Revenue, Net [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage										10.00%		10.00%		10.00%
Ten Percent Accounts Receivable member [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues										$ 0.0		$ 0.0
Ten Percent Accounts Receivable member [Member] | Accounts Receivable [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage										10.00%		10.00%

[1] Revenue is attributed to countries based on the location of the customer.