Other Income (Expense) - Net - Computation of Other Income (Expense) - Net (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Other Income and Expenses [Abstract]
Interest income	$ 0.3	$ 0.3	$ 0.7	$ 0.7
Net foreign exchange loss	(0.7)	(1.0)	(2.6)	(2.5)
Net periodic pension and postretirement benefits – non-service	2.4	2.8	5.4	5.0
Other	0.0	0.0	0.0	0.4
Total other income (expense) – net	$ 2.0	$ 2.1	$ 3.5	$ 3.6