Revenue from Contracts with Customers - Schedule of Deferred Revenue and Customer Advances by Arrangement (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Change in Contract with Customer, Liability [Line Items]
Beginning balance, January 1	$ 24.8	$ 17.5
Additions to deferred revenue and customer advances	107.4	77.7
Amount of deferred revenue and customer advances recognized in income	(95.5)	(75.0)
Ending balance, December 31	$ 36.7	24.8
Electro Scientific Industries Inc [Member]
Change in Contract with Customer, Liability [Line Items]
Deferred revenue and customer advances assumed		$ 4.6