Other Income (Expense) - Net - Computation of Other Income (Expense) - Net (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Other Income and Expenses [Abstract]
Interest income		$ 0.2	$ 0.2	$ 0.5
Net foreign exchange loss	$ (2.0)	(1.0)	(5.7)	(0.9)
Other	(0.1)		(0.2)	0.1
Total other income (expense) - net	$ (2.1)	$ (0.8)	$ (5.7)	$ (0.3)