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Business Segment, Geographic Area, and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Accounts receivable	$ 443.4	$ 392.7
Inventories	550.4	501.4
Total assets	993.8	894.1
Operating Segments [Member] | Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Accounts receivable	292.2	229.1
Inventories	317.9	273.3
Total assets	610.1	502.4
Operating Segments [Member] | Light & Motion [Member]
Segment Reporting Information [Line Items]
Accounts receivable	139.1	122.6
Inventories	170.9	166.1
Total assets	310.0	288.7
Operating Segments [Member] | Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Accounts receivable	36.7	51.7
Inventories	64.1	63.7
Total assets	100.8	115.4
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Accounts receivable	(24.6)	(10.7)
Inventories	(2.5)	(1.7)
Total assets	$ (27.1)	$ (12.4)

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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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