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Business Segment, Geographic Area, and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Accounts receivable	$ 431.7	$ 392.7
Inventory, net	527.0	501.4
Total assets	958.7	894.1
Operating Segments [Member] | Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Accounts receivable	257.0	229.1
Inventory, net	310.0	273.3
Total assets	567.0	502.4
Operating Segments [Member] | Light & Motion [Member]
Segment Reporting Information [Line Items]
Accounts receivable	131.3	122.6
Inventory, net	157.1	166.1
Total assets	288.4	288.7
Operating Segments [Member] | Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Accounts receivable	66.7	51.7
Inventory, net	63.3	63.7
Total assets	130.0	115.4
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Accounts receivable	(23.3)	(10.7)
Inventory, net	(3.4)	(1.7)
Total assets	$ (26.7)	$ (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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