Income Taxes - Income Tax (Benefit) Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Current
Canada	$ 0.0	$ 0.0	$ 0.0
Outside Canada	2.3	3.9	1.3
Income tax (benefit) expense, current continuing operations, Total	2.3	3.9	1.3
Deferred
Canada	(5.6)	0.0	8.7
Outside Canada	(1.5)	(33.9)	11.2
Income tax (benefit) expense, deferred continued operations, Total	(7.1)	(33.9)	19.9
Income tax (benefit) expense	$ (4.8)	$ (30.0)	$ 21.2