Intangible Assets (Gross Carrying Amount And Accumulated Amortization Of Intangible Assets Subject To Amortization) (Details) (USD $) In Millions, unless otherwise specified	Mar. 30, 2012	Dec. 30, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 178.5	$ 258.6
Accumulated Amortization	(170.9)	(201.5)
Net	7.6	57.1
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	147.6	212.8
Accumulated Amortization	(147.3)	(169.1)
Net	0.3	43.7
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	30.9	35.2
Accumulated Amortization	(23.6)	(23.7)
Net	7.3	11.5
Trade Names/ Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets		0.2
Accumulated Amortization		(0.2)
Net
Leasehold Improvements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets		(2.7)
Accumulated Amortization		2.3
Net		(0.4)
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets		13.1
Accumulated Amortization		(10.8)
Net		$ 2.3