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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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