Other Income (Expense) - Net - Computation of Other Income (Expense) - Net (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Other Income and Expenses [Abstract]
Interest income	$ 0.1	$ 0.1
Net foreign exchange loss	(2.1)	(1.7)
Net periodic pension and postretirement benefits (costs) – non-service	0.6	(0.7)
Settlement of treasury lock	13.3	0.0
Loss on early extinguishment of debt	(7.8)	0.0
Other	(1.3)	(0.1)
Total other income (expense) – net	$ 2.8	$ (2.4)