Common Shares and Net (Loss) Income 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. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Numerator (in millions):
Continuing operations									$ 28.9	$ (3.6)	$ (60.3)
Discontinued operations									354.0	2.2	(17.5)
Net income (loss)									$ 382.9	$ (1.4)	$ (77.8)
Weighted average common shares outstanding - basic (in shares)									139,097	139,078	128,290
Continuing operations (In USD per share)	$ 0.03	$ 0.06	$ 0.09	$ 0.03	$ 0.07	$ 0.01	$ (0.03)	$ (0.07)	$ 0.21	$ (0.03)	$ (0.47)
Discontinued operations (In USD per share)	(0.02)	0.01	(0.01)	2.55	0.05	0.29	(0.15)	(0.19)	2.54	0.02	(0.14)
Net income (loss) (In USD per share)	0.01	0.07	0.08	2.58	0.12	0.30	(0.18)	(0.26)	$ 2.75	$ (0.01)	$ (0.61)
Denominator (in thousands):
Weighted average common shares outstanding - basic (in shares)									139,097	139,078	128,290
Diluted (in shares)									141,436	139,078	128,290
Diluted Earnings Per Share:
Continuing operations (In USD per share)	0.03	0.06	0.09	0.03	0.07	0.01	(0.03)	(0.07)	$ 0.21	$ (0.03)	$ (0.47)
Discontinued operations (In USD per share)	(0.02)	0.01	(0.01)	2.51	0.05	0.29	(0.15)	(0.19)	2.50	0.02	(0.14)
Net income (loss) (In USD per share)	$ 0.01	$ 0.07	$ 0.08	$ 2.54	$ 0.12	$ 0.30	$ (0.18)	$ (0.26)	$ 2.71	$ (0.01)	$ (0.61)
Performance-based RSUs
Denominator (in thousands):
Dilutive effect of awards (in shares)									900	0	0
Time-based RSUs
Denominator (in thousands):
Dilutive effect of awards (in shares)									240	0	0
Stock options
Denominator (in thousands):
Dilutive effect of awards (in shares)									1,199	0	0