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Business Segment, Geographic Area, and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Accounts receivable	$ 420.8	$ 392.7
Inventory, net	515.2	501.4
Total assets	936.0	894.1
Operating Segments [Member] | Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Accounts receivable	247.4	229.1
Inventory, net	290.5	273.3
Total assets	537.9	502.4
Operating Segments [Member] | Light & Motion [Member]
Segment Reporting Information [Line Items]
Accounts receivable	132.9	122.6
Inventory, net	157.4	166.1
Total assets	290.3	288.7
Operating Segments [Member] | Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Accounts receivable	61.5	51.7
Inventory, net	69.9	63.7
Total assets	131.4	115.4
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Accounts receivable	(21.0)	(10.7)
Inventory, net	(2.6)	(1.7)
Total assets	$ (23.6)	$ (12.4)

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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