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Business Segment, Geographic Area, Product/Service Offerings and Significant Customer Information - Reconciliation of Segment Gross Profit to Consolidated Net Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Gross profit | $ 262.0 |  |  | $ 205.0 |  |  | $ 747.9 | $ 614.1
Research and development | 42.5 |  |  | 41.7 |  |  | 127.7 | 122.3
Selling, general and administrative | 87.0 |  |  | 82.1 |  |  | 260.3 | 247.8
Acquisition and integration costs | 0.5 |  |  | 2.1 |  |  | 3.4 | 35.5
Restructuring and other | 3.1 |  |  | 1.5 |  |  | 6.8 | 4.7
Amortization of intangible assets | 12.5 |  |  | 17.0 |  |  | 42.6 | 50.3
Asset impairment |  |  |  |  |  |  | 1.2 |
COVID-19 related net credits |  |  |  |  |  |  | (1.2) |
Fees and expenses related to repricing of Term Loan Facility |  |  |  | 0.6 |  |  |  | 6.5
Gain on sale of long-lived assets |  |  |  | (6.8) |  |  |  | (6.8)
Income from operations | 116.4 |  |  | 66.8 |  |  | 307.1 | 153.8
Interest and other expense, net | 7.6 |  |  | 11.4 |  |  | 24.6 | 31.2
Income before income taxes | 108.8 |  |  | 55.4 |  |  | 282.5 | 122.6
Provision for income taxes | 17.1 |  |  | 8.0 |  |  | 48.0 | 25.0
Net income | 91.7 | $ 73.7 | $ 69.1 | 47.4 | $ 37.7 | $ 12.5 | 234.5 | 97.6
Vacuum & Analysis [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Gross profit | 163.5 |  |  | 102.8 |  |  | 444.1 | 303.0
Light & Motion [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Gross profit | 76.0 |  |  | 79.9 |  |  | 227.8 | 257.6
Equipment & Solutions [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Gross profit | $ 22.5 |  |  | $ 22.3 |  |  | $ 76.0 | $ 53.5

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