Schedule of Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Earnings Per Share Disclosure [Line Items]
Net income (loss)	$ (7.5)	$ 11.9	$ (8.0)	$ 13.5
Weighted average shares outstanding	127.6	126.9	127.4	126.6
Net income (loss) per share	$ (0.06)	$ 0.09	$ (0.06)	$ 0.11
Assumed exercise of common stock equivalents	0	1.8	0	2.5
Diluted weighted average common and common equivalent shares	127.6	128.7	127.4	129.1
Net income (loss) per share	$ (0.06)	$ 0.09	$ (0.06)	$ 0.10
Anti-dilutive common stock equivalents, non-vested stock, DSUs, RSUs, and PUs	2.4	3.6	2.2	4.7