Business Segment, Geographic Area, Product/Service Offerings and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Trade accounts receivable, net	$ 363.9	$ 341.1
Inventory, net	494.2	462.1
Total assets	858.1	803.2
Operating Segments [Member] | Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable, net	202.9	185.9
Inventory, net	261.0	224.8
Total assets	463.9	410.7
Operating Segments [Member] | Light & Motion [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable, net	143.7	147.2
Inventory, net	169.9	163.7
Total assets	313.6	310.9
Operating Segments [Member] | Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable, net	42.5	40.1
Inventory, net	64.6	73.5
Total assets	107.1	113.6
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable, net	(25.2)	(32.1)
Inventory, net	(1.3)	0.1
Total assets	$ (26.5)	$ (32.0)