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Acquisitions - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 01, 2019 | Sep. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Acquisition Date [Line Items] |  |  |  |  |
Goodwill |  |  | $ 1,062.1 | $ 1,058.5 | $ 587.0
Total purchase price, net of cash and cash equivalents acquired |  | $ 988.6 |  |  |
Electro Scientific Industries Inc [Member] |  |  |  |  |
Acquisition Date [Line Items] |  |  |  |  |
Current assets (excluding inventory) | $ 208.0 |  |  |  |
Inventory | 81.7 |  |  |  |
Intangible assets | 316.2 |  |  |  |
Goodwill | 474.0 |  |  |  |
Property, plant and equipment | 65.5 |  |  |  |
Long-term assets | 9.6 |  |  |  |
Total assets acquired | 1,155.0 |  |  |  |
Current liabilities | 51.5 |  |  |  |
Non-current deferred taxes | 33.0 |  |  |  |
Other long-term liabilities | 7.2 |  |  |  |
Total liabilities assumed | 91.7 |  |  |  |
Fair value of assets acquired and liabilities assumed | 1,063.3 |  |  |  |
Less: Cash and cash equivalents acquired | (44.1) |  |  |  |
Total purchase price, net of cash and cash equivalents acquired | $ 1,019.2 |  |  |  |

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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=121600890&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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- Definition The amount of inventory recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=121600890&loc=d3e2207-128464 + Details
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