Computation Of Net Income Per Share (Schedule Of Computation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Mar. 27, 2011
Computation Of Net Income Per Share [Abstract]
Net income	$ 1.6	$ 43.5
Basic weighted average shares outstanding	126.3	126.1
Net income per share, Basic	$ 0.01	$ 0.34
Assumed exercise of common stock equivalents	2.9	4.8
Diluted weighted average common and common equivalent shares	129.2	130.9
Net income per share, Diluted	$ 0.01	$ 0.33
Anti-dilutive common stock equivalents, non-vested stock, DSUs, RSUs, and PUs	6.0	4.8