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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 | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit | $ 301.6 | $ 262.0 | $ 246.3 | $ 239.6 | $ 216.3 | $ 205.0 | $ 211.0 | $ 198.1 | $ 1,049.5 | $ 830.4 | $ 979.5
Research and development |  |  |  |  |  |  |  |  | 173.1 | 164.1 | 135.7
Selling, general and administrative |  |  |  |  |  |  |  |  | 353.1 | 330.3 | 298.1
Acquisition and integration costs |  |  |  |  |  |  |  |  | 3.8 | 37.3 | 3.1
Restructuring and other |  |  |  |  |  |  |  |  | 9.4 | 7.0 | 4.6
Amortization of intangible assets |  |  |  |  |  |  |  |  | 55.2 | 67.4 | 43.5
Asset impairment |  |  |  |  |  |  |  |  | 2.3 | 4.7 |
COVID-19 related net credits |  |  |  |  |  |  |  |  | (1.2) |  |
Fees and expenses related to repricing of Term Loan Facility |  |  |  |  |  |  |  |  |  | 6.6 | 0.4
Gain on sale of long-lived assets |  |  |  |  |  |  |  |  |  | (6.8) |
Income from operations | 146.7 | 116.4 | 100.8 | 89.9 | 66.1 | 66.8 | 63.9 | 23.1 | 453.8 | 219.8 | 494.1
Interest income |  |  |  |  |  |  |  |  | 1.4 | 5.4 | 5.8
Interest expense |  |  |  |  |  |  |  |  | 29.1 | 44.1 | 16.9
Other expense, net |  |  |  |  |  |  |  |  | 3.1 | 3.3 | 2.0
Income before income taxes |  |  |  |  |  |  |  |  | 423.0 | 177.8 | 481.0
Provision for income taxes |  |  |  |  |  |  |  |  | 72.9 | 37.4 | 88.1
Net income | $ 115.6 | $ 91.7 | $ 73.7 | $ 69.1 | $ 42.8 | $ 47.4 | $ 37.7 | $ 12.5 | 350.1 | 140.4 | 392.9
Vacuum & Analysis [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 633.7 | 426.4 | 577.6
Light & Motion [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 309.8 | 336.8 | $ 401.9
Equipment & Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | $ 106.0 | $ 67.2 |

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