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Business Segment, Geographic Area, Product/Service Offerings and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Trade accounts receivable, net | $ 363.9 | $ 341.1
Inventory, net | 494.2 | 462.1
Total assets | 858.1 | 803.2
Operating Segments [Member] | Vacuum & Analysis [Member] |  |
Segment Reporting Information [Line Items] |  |
Trade accounts receivable, net | 202.9 | 185.9
Inventory, net | 261.0 | 224.8
Total assets | 463.9 | 410.7
Operating Segments [Member] | Light & Motion [Member] |  |
Segment Reporting Information [Line Items] |  |
Trade accounts receivable, net | 143.7 | 147.2
Inventory, net | 169.9 | 163.7
Total assets | 313.6 | 310.9
Operating Segments [Member] | Equipment & Solutions [Member] |  |
Segment Reporting Information [Line Items] |  |
Trade accounts receivable, net | 42.5 | 40.1
Inventory, net | 64.6 | 73.5
Total assets | 107.1 | 113.6
Corporate, Eliminations & Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Trade accounts receivable, net | (25.2) | (32.1)
Inventory, net | (1.3) | 0.1
Total assets | $ (26.5) | $ (32.0)

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