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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)

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