Income Tax Expense (Benefit) - Income Tax Expense (Benefit) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Current
Canada	$ (0.3)	$ 4.0
Outside Canada	2.7	3.7	$ 2.5
Income tax (benefit) expense, current, Total	2.4	7.7	2.5
Deferred
Canada	8.7	(2.5)	0.3
Outside Canada	14.5	(27.9)	(64.2)
Income tax (benefit) expense, deferred, Total	23.2	(30.4)	(63.9)
Income tax expense (benefit)	$ 25.6	$ (22.7)	$ (61.4)