Schedule of Computation of Basic and Diluted Income Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Earnings Per Share Disclosure [Line Items]
Net income (loss)	$ (1.0)	$ 12.1	$ 7.5	$ 4.1
Weighted average shares outstanding	119.5	127.3	122.5	127.4
Net income (loss) per share	$ (0.01)	$ 0.10	$ 0.06	$ 0.03
Assumed exercise of common stock equivalents		1.1	1.9	1.4
Diluted weighted average common and common equivalent shares	119.5	128.4	124.4	128.8
Net income (loss) per share	$ (0.01)	$ 0.09	$ 0.06	$ 0.03
Anti-dilutive common stock equivalents, non-vested stock, PSUs, DSUs, and RSUs	2.6	2.4	0.5	2.2