Common Shares and Net Income (Loss) per Common Share - Reconciliation of Numerator and Denominators of Basic and Diluted Net (Loss) Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Numerator (in millions):
Continuing operations									$ (0.1)	$ 28.9	$ (3.6)
Discontinued operations									3.0	354.0	2.2
Net income (loss)									$ 2.9	$ 382.9	$ (1.4)
Basic Earnings Per Share:
Weighted average common shares outstanding - basic (in shares)									135,224	139,097	139,078
Continuing operations (In USD per share)	$ 0.05	$ 0.06	$ 0.03	$ (0.14)	$ 0.03	$ 0.06	$ 0.09	$ 0.03	$ 0	$ 0.21	$ (0.03)
Discontinued operations (In USD per share)	0.01	0.01	0	0	(0.02)	0.01	(0.01)	2.55	0.02	2.54	0.02
Net income (loss) (In USD per share)	0.06	0.07	0.03	(0.14)	0.01	0.07	0.08	2.58	$ 0.02	$ 2.75	$ (0.01)
Denominator (in thousands):
Weighted average common shares outstanding - basic (in shares)									135,224	139,097	139,078
Diluted (in shares)									135,224	141,436	139,078
Diluted Earnings Per Share:
Continuing operations (In USD per share)	0.05	0.06	0.03	(0.14)	0.03	0.06	0.09	0.03	$ 0	$ 0.21	$ (0.03)
Discontinued operations (In USD per share)	0.01	0.01	0	0	(0.02)	0.01	(0.01)	2.51	0.02	2.50	0.02
Net income (loss) (In USD per share)	$ 0.06	$ 0.07	$ 0.03	$ (0.14)	$ 0.01	$ 0.07	$ 0.08	$ 2.54	$ 0.02	$ 2.71	$ (0.01)
Performance-based RSUs
Denominator (in thousands):
Dilutive effect of awards (in shares)									0	900	0
Time-based RSUs
Denominator (in thousands):
Dilutive effect of awards (in shares)									0	240	0
Stock options
Denominator (in thousands):
Dilutive effect of awards (in shares)									0	1,199	0