Business Segment, Geographic Area, Product/Service Offerings and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Accounts receivable	$ 381.0	$ 341.1
Inventory, net	474.2	462.1
Total assets	855.2	803.2
Operating Segments [Member] | Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Accounts receivable	196.1	185.9
Inventory, net	227.2	224.8
Total assets	423.3	410.7
Operating Segments [Member] | Light & Motion [Member]
Segment Reporting Information [Line Items]
Accounts receivable	158.6	147.2
Inventory, net	174.5	163.7
Total assets	333.1	310.9
Operating Segments [Member] | Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Accounts receivable	57.7	40.1
Inventory, net	72.4	73.5
Total assets	130.1	113.6
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Accounts receivable	(31.4)	(32.1)
Inventory, net	0.1	0.1
Total assets	$ (31.3)	$ (32.0)