Segment Information (Schedule Of Selected Operating Segment Financial Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 01, 2012		Mar. 27, 2011
Segment Reporting Information [Line Items]
Total revenue	$ 352.2		$ 413.0
Operating income (loss)	2.9		51.9
Other expense, net	1.5		1.1
Income before income taxes	1.4		50.8
Restructuring and impairments expense	(2.4)		(2.5)
Stock-based compensation expense	(6.9)		(5.0)
Selling, general and administrative expense	(54.7)		(55.1)
MCCC [Member]
Segment Reporting Information [Line Items]
Total revenue	142.6		144.1
Operating income (loss)	24.9		27.8
PCIA [Member]
Segment Reporting Information [Line Items]
Total revenue	174.2		212.3
Operating income (loss)	25.0		60.0
SDT [Member]
Segment Reporting Information [Line Items]
Total revenue	35.4		56.6
Operating income (loss)	4.3		13.4
Corporate [Member]
Segment Reporting Information [Line Items]
Restructuring and impairments expense	(2.4)		(2.5)
Stock-based compensation expense	(6.9)		(5.0)
Selling, general and administrative expense	(42.2)		(41.4)
Other	$ 0.2	[1]	$ (0.4)	[1]

[1] Other in 2011 primarily consists of accelerated depreciation related to the previously planned closure of the Mountaintop facility.