Business Segment, Geographic Area, Product/Service Offerings and Significant Customer Information - Net Revenues by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Net revenues	$ 589.8	$ 462.5	$ 1,669.8	$ 1,400.1
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Net revenues	361.3	240.7	995.1	710.7
Light & Motion [Member]
Segment Reporting Information [Line Items]
Net revenues	175.9	172.4	507.3	549.0
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Net revenues	$ 52.6	$ 49.4	$ 167.4	$ 140.4