Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Mar. 27, 2011
Consolidated Statements Of Operations [Abstract]
Total revenue	$ 352.2	$ 413.0
Cost of sales	247.3	261.0
Gross margin	104.9	152.0
Gross margin %	29.80%	36.80%
Operating expenses:
Research and development	40.1	36.9
Selling, general and administrative	54.7	55.1
Amortization of acquisition-related intangibles	4.8	5.6
Restructuring and impairments	2.4	2.5
Total operating expenses	102.0	100.1
Operating income	2.9	51.9
Other expense, net	1.5	1.1
Income before income taxes	1.4	50.8
Provision (benefit) for income taxes	(0.2)	7.3
Net income	$ 1.6	$ 43.5
Net income per common share:
Basic	$ 0.01	$ 0.34
Diluted	$ 0.01	$ 0.33
Weighted average common shares:
Basic	126.3	126.1
Diluted	129.2	130.9