Goodwill And Intangible Assets (Summary Of Acquired Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 25, 2011	Dec. 26, 2010
Identifiable intangible assets, Gross Carrying Amount	$ 414.9	$ 399.5
Identifiable intangible assets, Accumulated Amortization	(344.8)	(329.8)
Goodwill	169.3	164.8
Goodwill, Accumulated Amortization
Identifiable intangible assets, including goodwill, gross carrying amount	584.2	564.4
Minimum [Member] | Customer Base [Member]
Identifiable intangible assets, Period of Amortization, years	8
Developed Technology [Member] | Minimum [Member]
Identifiable intangible assets, Period of Amortization, years	2
Maximum [Member] | Customer Base [Member]
Identifiable intangible assets, Period of Amortization, years	10
Developed Technology [Member] | Maximum [Member]
Identifiable intangible assets, Period of Amortization, years	15
In Process R&D [Member]
Identifiable intangible assets, Gross Carrying Amount	2.8	1.8
In Process R&D, Period of Amortization, years	indefinite lived
Covenant Not To Compete [Member]
Identifiable intangible assets, Gross Carrying Amount	30.4	30.4
Identifiable intangible assets, Accumulated Amortization	(30.4)	(30.4)
Identifiable intangible assets, Period of Amortization, years	5
Assembled Workforce [Member]
Identifiable intangible assets, Gross Carrying Amount	1.0	1.0
Identifiable intangible assets, Accumulated Amortization	(1.0)	(0.9)
Identifiable intangible assets, Period of Amortization, years	5
Process Technology [Member]
Identifiable intangible assets, Gross Carrying Amount	1.6	1.6
Identifiable intangible assets, Accumulated Amortization	(1.5)	(1.2)
Identifiable intangible assets, Period of Amortization, years	5
Patents [Member]
Identifiable intangible assets, Gross Carrying Amount	5.9	5.9
Identifiable intangible assets, Accumulated Amortization	(5.7)	(5.6)
Identifiable intangible assets, Period of Amortization, years	4
Trademarks And Tradenames [Member]
Identifiable intangible assets, Gross Carrying Amount	25.2	25.2
Identifiable intangible assets, Accumulated Amortization	(25.2)	(25.2)
Identifiable intangible assets, Period of Amortization, years	1
Customer Base [Member]
Identifiable intangible assets, Gross Carrying Amount	81.6	81.6
Identifiable intangible assets, Accumulated Amortization	(67.8)	(65.9)
Developed Technology [Member]
Identifiable intangible assets, Gross Carrying Amount	250.7	238.9
Identifiable intangible assets, Accumulated Amortization	(210.8)	(199.0)
Core Technology [Member]
Identifiable intangible assets, Gross Carrying Amount	15.7	13.1
Identifiable intangible assets, Accumulated Amortization	$ (2.4)	$ (1.6)
Identifiable intangible assets, Period of Amortization, years	10