MKS Instruments (MKSI) 10-Q 3 Nov 21 2021 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Oct. 27, 2021
Cover [Abstract]
Amendment Flag	false
Document Type	10-Q
Document Quarterly Report	true
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Document Transition Report	false
Current Fiscal Year End Date	--12-31
Document Period End Date	Sep. 30, 2021
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Entity Registrant Name	MKS INSTRUMENTS, INC.
Entity Central Index Key	0001049502
Trading Symbol	MKSI
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		55,458,911
Entity File Number	0-23621
Entity Tax Identification Number	04-2277512
Entity Address, Address Line One	2 Tech Drive, Suite 201,
Entity Address, City or Town	Andover
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01810
Entity Incorporation, State or Country Code	MA
City Area Code	978
Local Phone Number	645-5500
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common Stock

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 633.3	$ 608.3
Short-term investments	246.3	227.7
Trade accounts receivable, net of allowance for doubtful accounts of $2.4 and $2.0 at September 30, 2021 and December 31, 2020, respectively	443.4	392.7
Inventories	550.4	501.4
Other current assets	121.5	74.3
Total current assets	1,994.9	1,804.4
Property, plant and equipment, net	316.8	284.3
Right-of-use assets	184.5	184.4
Goodwill	1,226.2	1,066.4
Intangible assets, net	589.5	512.2
Long-term investments	6.4	6.5
Other assets	47.6	45.6
Total assets	4,365.9	3,903.8
Current liabilities:
Short-term debt	9	14.5
Accounts payable	150.8	110.6
Accrued compensation	118.9	117.9
Income taxes payable	16.5	18.3
Lease liabilities	17.3	15.8
Deferred revenue and customer advances	37.6	31.2
Other current liabilities	87	65.6
Total current liabilities	437.1	373.9
Long-term debt, net	809.7	815
Non-current deferred taxes	98.5	59.2
Non-current accrued compensation	48.7	49.5
Non-current lease liabilities	193	187.4
Other non-current liabilities	50.3	57.9
Total liabilities	1,637.3	1,542.9
Commitments and contingencies (Note 19)
Stockholders’ equity:
Preferred Stock, $0.01 par value per share, 2 shares authorized; none issued and outstanding
Common Stock, no par value, 200 shares authorized; 55.5 and 55.2 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	0.1	0.1
Additional paid-in capital	892.8	873.2
Retained earnings	1,853	1,487.3
Accumulated other comprehensive (loss) income	(17.3)	0.3
Total stockholders’ equity	2,728.6	2,360.9
Total liabilities and stockholders’ equity	$ 4,365.9	$ 3,903.8

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2.4	$ 2
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	55,500,000	55,200,000
Common stock, shares outstanding	55,500,000	55,200,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net revenues:
Net revenues	$ 741.9	$ 589.8	$ 2,185.7	$ 1,669.8
Cost of revenues:
Cost of revenues	393.5	327.8	1,160	921.9
Gross profit	348.4	262	1,025.7	747.9
Research and development	51.7	42.5	148.9	127.7
Selling, general and administrative	95.8	87	288.9	260.3
Acquisition and integration costs	8.6	0.5	20.8	3.4
Restructuring and other	2	3.1	9.9	6.8
Amortization of intangible assets	15	12.5	40.1	42.6
Asset impairment				1.2
COVID-19 related net credits				(1.2)
Income from operations	175.3	116.4	517.1	307.1
Interest income	0.1	0.1	0.4	1.1
Interest expense	6.3	6.6	19.1	22.7
Other expense, net	2.9	1.1	11.5	3
Income before income taxes	166.2	108.8	486.9	282.5
Provision for income taxes	33.8	17.1	85.7	48
Net income	132.4	91.7	401.2	234.5
Other comprehensive income, net of tax:
Changes in value of financial instruments designated as cash flow hedges	3	(0.6)	13.9	(7.7)
Foreign currency translation adjustments	(18.2)	17.1	(31.6)	12.1
Net unrecognized pension gain	0.3	0.1	0.2	0.1
Unrealized (loss) gain on investments			(0.1)	0.2
Total comprehensive income	$ 117.5	$ 108.3	$ 383.6	$ 239.2
Net income per share:
Basic	$ 2.39	$ 1.66	$ 7.24	$ 4.26
Diluted	$ 2.38	$ 1.66	$ 7.21	$ 4.24
Weighted average common shares outstanding:
Basic	55.5	55.2	55.4	55.1
Diluted	55.7	55.4	55.7	55.3
Products [Member]
Net revenues:
Net revenues	$ 649.1	$ 506.8	$ 1,910.8	$ 1,441
Cost of revenues:
Cost of revenues	344.5	280.7	1,011.8	794.8
Services [Member]
Net revenues:
Net revenues	92.8	83	274.9	228.8
Cost of revenues:
Cost of revenues	$ 49	$ 47.1	$ 148.2	$ 127.1

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2019	$ 2,023.3	$ 0.1	$ 864.3	$ 1,181.2	$ (22.3)
Beginning Balance, Shares at Dec. 31, 2019		54,600,000
Net issuance under stock-based plans	(20.4)		(20.4)
Net issuance under stock-based plans, Shares		300,000
Stock-based compensation	8.5		8.5
Cash dividend	(11)			(11)
Comprehensive income (net of tax):
Net income	69.1			69.1
Other comprehensive income (loss)	(17)				(17)
Ending Balance at Mar. 31, 2020	2,052.5	$ 0.1	852.4	1,239.3	(39.3)
Ending Balance, Shares at Mar. 31, 2020		54,900,000
Beginning Balance at Dec. 31, 2019	2,023.3	$ 0.1	864.3	1,181.2	(22.3)
Beginning Balance, Shares at Dec. 31, 2019		54,600,000
Comprehensive income (net of tax):
Net income	234.5
Ending Balance at Sep. 30, 2020	2,226.8	$ 0.1	861.6	1,382.7	(17.6)
Ending Balance, Shares at Sep. 30, 2020		55,100,000
Beginning Balance at Mar. 31, 2020	2,052.5	$ 0.1	852.4	1,239.3	(39.3)
Beginning Balance, Shares at Mar. 31, 2020		54,900,000
Net issuance under stock-based plans	(0.5)		(0.5)
Net issuance under stock-based plans, Shares		200,000
Stock-based compensation	6.8		6.8
Cash dividend	(11)			(11)
Comprehensive income (net of tax):
Net income	73.7			73.7
Other comprehensive income (loss)	5.1				5.1
Ending Balance at Jun. 30, 2020	2,126.6	$ 0.1	858.7	1,302	(34.2)
Ending Balance, Shares at Jun. 30, 2020		55,100,000
Net issuance under stock-based plans	(4.5)		(4.5)
Stock-based compensation	7.4		7.4
Cash dividend	(11)			(11)
Comprehensive income (net of tax):
Net income	91.7			91.7
Other comprehensive income (loss)	16.6				16.6
Ending Balance at Sep. 30, 2020	2,226.8	$ 0.1	861.6	1,382.7	(17.6)
Ending Balance, Shares at Sep. 30, 2020		55,100,000
Beginning Balance at Dec. 31, 2020	2,360.9	$ 0.1	873.2	1,487.3	0.3
Beginning Balance, Shares at Dec. 31, 2020		55,200,000
Net issuance under stock-based plans	(5.3)		(5.3)
Net issuance under stock-based plans, Shares		100,000
Stock-based compensation	10		10
Cash dividend	(11.1)			(11.1)
Comprehensive income (net of tax):
Net income	122.3			122.3
Other comprehensive income (loss)	(7.8)				(7.8)
Ending Balance at Mar. 31, 2021	2,469	$ 0.1	877.9	1,598.5	(7.5)
Ending Balance, Shares at Mar. 31, 2021		55,300,000
Beginning Balance at Dec. 31, 2020	2,360.9	$ 0.1	873.2	1,487.3	0.3
Beginning Balance, Shares at Dec. 31, 2020		55,200,000
Comprehensive income (net of tax):
Net income	401.2
Ending Balance at Sep. 30, 2021	2,728.6	$ 0.1	892.8	1,853	(17.3)
Ending Balance, Shares at Sep. 30, 2021		55,500,000
Beginning Balance at Mar. 31, 2021	2,469	$ 0.1	877.9	1,598.5	(7.5)
Beginning Balance, Shares at Mar. 31, 2021		55,300,000
Net issuance under stock-based plans	(2.4)		(2.4)
Net issuance under stock-based plans, Shares		100,000
Stock-based compensation	8.8		8.8
Cash dividend	(12.2)			(12.2)
Comprehensive income (net of tax):
Net income	146.5			146.5
Other comprehensive income (loss)	5.1				5.1
Ending Balance at Jun. 30, 2021	2,614.8	$ 0.1	884.3	1,732.8	(2.4)
Ending Balance, Shares at Jun. 30, 2021		55,400,000
Net issuance under stock-based plans	(0.4)		(0.4)
Net issuance under stock-based plans, Shares		100,000
Stock-based compensation	8.9		8.9
Cash dividend	(12.2)			(12.2)
Comprehensive income (net of tax):
Net income	132.4			132.4
Other comprehensive income (loss)	(14.9)				(14.9)
Ending Balance at Sep. 30, 2021	$ 2,728.6	$ 0.1	$ 892.8	$ 1,853	$ (17.3)
Ending Balance, Shares at Sep. 30, 2021		55,500,000

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Statement Of Stockholders Equity [Abstract]
Cash dividend, per common share	$ 0.22	$ 0.22	$ 0.20	$ 0.20	$ 0.20	$ 0.20

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows provided by operating activities:
Net income	$ 401.2	$ 234.5
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	76.1	75.8
Unrealized gain on derivatives not designated as hedging instruments	(1.3)	(1.2)
Amortization of debt issuance costs, original issue discount, and soft call premium	1.8	2.1
Stock-based compensation	27.8	22.7
Provision for excess and obsolete inventory	13.6	19.8
Deferred income taxes	7.2	(0.7)
Asset impairment		1.2
Other	1.4	1.8
Changes in operating assets and liabilities:
Trade accounts receivable	(51.3)	(20.9)
Inventories	(61.7)	(47.1)
Other current and non-current assets	(0.2)	10.9
Accounts payable	38.2	24.5
Accrued compensation	2.5	(5.8)
Income taxes payable	(28.7)	21.4
Other current and non-current liabilities	18.6	27
Net cash provided by operating activities	445.2	366
Cash flows used in investing activities:
Acquisition of business, net of cash acquired	(268.4)
Purchases of investments	(497)	(358.2)
Maturities of investments	342.9	181.5
Sales of investments	134.6	64.3
Purchases of property, plant and equipment	(63.3)	(59.9)
Net cash used in investing activities	(351.2)	(172.3)
Cash flows used in financing activities:
Net proceeds from borrowings	1	20.1
Payments on short-term and long-term borrowings	(12.8)	(77)
Dividend payments	(35.5)	(33)
Net payments related to employee stock awards	(14.4)	(25.4)
Net cash used in financing activities	(61.7)	(115.3)
Effect of exchange rate changes on cash and cash equivalents	(7.3)	0.3
Increase in cash and cash equivalents	25	78.7
Cash and cash equivalents at beginning of period	608.3	414.6
Cash and cash equivalents at end of period	$ 633.3	$ 493.3

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	1) Basis of Presentation The terms “MKS” and the “Company” refer to MKS Instruments, Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The interim financial data as of September 30, 2021, and for the three and nine months ended September 30, 2021 are unaudited; however, in the opinion of MKS, the interim data includes all adjustments, consisting of normal recurring adjustments, necessary for a fair statement of the results for the interim periods. The condensed consolidated balance sheet presented as of December 31, 2020 has been derived from the consolidated audited financial statements as of that date. The unaudited condensed consolidated financial statements presented herein have been prepared in accordance with the instructions to Form 10-Q and do not include all of the information and note disclosures required by United States generally accepted accounting principles (“U.S. GAAP”). The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the MKS Annual Report on Form 10-K for the year ended December 31, 2020 filed with the U.S. Securities and Exchange Commission on February 23, 2021. The preparation of these unaudited condensed consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On an on-going basis, management evaluates its estimates and judgments, including those related to revenue recognition, inventory valuation, warranty costs, stock-based compensation, intangible assets, goodwill, other long-lived assets and other acquisition expenses and income taxes

Recently Issued or Adopted Acco

Recently Issued or Adopted Accounting Pronouncements	9 Months Ended
	Sep. 30, 2021
Accounting Changes And Error Corrections [Abstract]
Recently Issued or Adopted Accounting Pronouncements	2) Recently Issued or Adopted Accounting Prono uncements In October 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2021-08, "Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers" ("ASU No. 2021-08"). ASU No. 2021-08 will require companies to apply the definition of a performance obligation under ASC Topic 606 to recognize and measure contract assets and contract liabilities (i.e., deferred revenue) relating to contracts with customers that are acquired in a business combination. Under current U.S. GAAP, an acquirer generally recognizes assets acquired and liabilities assumed in a business combination, including contract assets and contract liabilities arising from revenue contracts with customers, at fair value on the acquisition date. ASU No. 2021-08 will result in the acquirer recording acquired contract assets and liabilities on the same basis that would have been recorded by the acquiree before the acquisition under ASC Topic 606. ASU No. 2021-08 is effective for fiscal years beginning after December 15, 2022, with early adoption permitted. The Company is currently evaluating the impact of this ASU on its financial statements. In March 2020, the FASB issued ASU No. 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” This standard provides temporary optional expedients and exceptions to accounting guidance on contract modifications and hedge accounting to ease entities’ financial reporting burdens as the market transitions from the London Interbank Offered Rate (“LIBOR”) and other interbank offered rates to alternative reference rates. The standard was effective upon issuance and generally can be applied through December 31, 2022. In January 2021, the FASB issued ASU 2021-01, “Reference Rate Reform (Topic 848): Scope.” The amendments in this update clarify that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivative instruments that use an interest rate for margining, discounting, or contract price alignment that is modified as a result of reference rate reform. Amendments in this update to the expedients and exceptions in Topic 848 capture the incremental consequences of the scope clarification and tailor the existing guidance to derivative instruments affected by the discounting transition. The amendments in this update do not apply to contract modifications made after December 31, 2022, new hedging relationships entered into after December 31, 2022, and existing hedging relationships evaluated for effectiveness in periods after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that apply certain optional expedients in which the accounting effects are recorded through the end of the hedging relationship (including periods after December 31, 2022). The Company’s adoption of the requirements of these standards has not resulted in a material impact on its financial position, results of operations and cash flows, but the adoption of the requirements may impact the Company in the future. In December 2019, the FASB issued ASU 2019-12, “Income Taxes (Topic 740).” This standard simplifies the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The amendments also improve consistent application and simplify U.S. GAAP for other areas of Topic 740 by clarifying and amending existing guidance. This standard is effective for annual periods , and interim periods within those fiscal years, beginning after December 15, 202 0 . The Company adopted this ASU during the first quarter of 2021 and the adoption of this ASU did no t have a material impact on its financial position, results of operations and cash flows.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 2021
Revenue From Contract With Customer [Abstract]
Revenue from Contracts with Customers	3 ) Revenue from Contracts with Customers Contract assets as of September 30, 2021 and December 31, 2020 were $3.8 and $3.7, respectively, and are included in other current assets. A rollforward of the Company’s deferred revenue and customer advances is as follows: Nine Months Ended September 30, 2021 September 30, 2020 Beginning balance, January 1 (1) $ 36.7 $ 24.8 Additions to deferred revenue and customer advances 68.1 76.3 Amount of deferred revenue and customer advances recognized in income (63.7 ) (65.6 ) Ending balance, September 30 (2) $ 41.1 $ 35.5 (1) Beginning deferred revenue and customer advances as of January 1, 2021 included $18.4 of current deferred revenue, $5.5 of long-term deferred revenue and $12.8 of current customer advances. (2) Ending deferred revenue and customer advances as of September 30, 2021 included $20.0 of current deferred revenue, $3.5 of long-term deferred revenue and $17.6 of current customer advances. Disaggregation of Revenue The following table summarizes revenue from contracts with customers: Three Months Ended September 30, 2021 Vacuum & Analysis Light & Motion Equipment & Solutions Total Net revenues: Products $ 425.7 $ 190.8 $ 32.6 $ 649.1 Services 57.4 17.9 17.5 92.8 Total net revenues $ 483.1 $ 208.7 $ 50.1 $ 741.9 Three Months Ended September 30, 2020 Vacuum & Analysis Light & Motion Equipment & Solutions Total Net revenues: Products $ 313.9 $ 156.9 $ 36.0 $ 506.8 Services 47.4 19.0 16.6 83.0 Total net revenues $ 361.3 $ 175.9 $ 52.6 $ 589.8 Nine Months Ended September 30, 2021 Vacuum & Analysis Light & Motion Equipment & Solutions Total Net revenues: Products $ 1,203.7 $ 531.5 $ 175.6 $ 1,910.8 Services 172.9 52.1 49.9 274.9 Total net revenues $ 1,376.6 $ 583.6 $ 225.5 $ 2,185.7 Nine Months Ended September 30, 2020 Vacuum & Analysis Light & Motion Equipment & Solutions Total Net revenues: Products $ 863.5 $ 457.3 $ 120.2 $ 1,441.0 Services 131.6 50.0 47.2 228.8 Total net revenues $ 995.1 $ 507.3 $ 167.4 $ 1,669.8 Product revenue, excluding revenue from certain custom products, is recorded at a point in time, while the majority of the service revenue and revenue from certain custom products is recorded over time.

Investments

Investments	9 Months Ended
	Sep. 30, 2021
Investments Debt And Equity Securities [Abstract]
Investments	4 ) Investments The following tables show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments: As of September 30, 2021: Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value Short-term investments: Time deposits and certificates of deposit $ 24.0 $ — $ — $ 24.0 Bankers’ acceptance drafts 2.5 — — 2.5 Commercial paper 86.2 — — 86.2 Corporate obligations 35.3 — — 35.3 U.S. treasury obligations 98.3 — — 98.3 $ 246.3 $ — $ — $ 246.3 As of September 30, 2021: Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value Long-term investments: Group insurance contracts $ 5.5 $ 0.9 $ — $ 6.4 As of December 31, 2020: Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value Short-term investments: Time deposits and certificates of deposit $ 0.7 $ — $ — $ 0.7 Bankers' acceptance drafts 3.8 — — 3.8 U.S. treasury obligations 223.2 — — 223.2 $ 227.7 $ — $ — $ 227.7 As of December 31, 2020: Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value Long-term investments: Group insurance contracts $ 5.6 $ 0.9 $ — $ 6.5 Management has the ability to liquidate its investments in order to meet the Company’s liquidity needs in the next 12 months. Accordingly, those investments with contractual maturities greater than one year from the date of purchase are classified as short-term on the accompanying balance sheets. Interest income is accrued as earned. Dividend income is recognized as income on the date the security trades “ex-dividend.” The cost of marketable securities sold is determined by the specific identification method. Realized gains or losses are reflected in income and were not material for the three and nine months ended September 30, 2021 and 2020.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	5 ) Fair Value Measurements In accordance with the provisions of fair value accounting, a fair value measurement assumes that the transaction to sell an asset or transfer a liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability and defines fair value based upon an exit price model. The fair value measurement guidance establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The guidance describes three levels of inputs that may be used to measure fair value: Level 1 Quoted prices in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments or securities or derivative contracts that are valued using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data. Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the Company categorizes such assets and liabilities based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. Assets and liabilities of the Company are measured at fair value on a recurring basis as of September 30, 2021 and are summarized as follows: Fair Value Measurements at Reporting Date Using Description September 30, 2021 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Cash equivalents: Money market funds $ 44.7 $ 44.7 $ — $ — Commercial paper 0.1 — 0.1 — U.S. treasury obligations 17.5 — 17.5 — Available-for-sale investments: Time deposits and certificates of deposit 23.9 — 23.9 — Bankers' acceptance drafts 2.5 — 2.5 — Commercial paper 86.2 — 86.2 — Corporate obligations 35.3 — 35.3 U.S. treasury obligations 98.3 — 98.3 — Group insurance contracts 6.4 — 6.4 — Derivatives – foreign exchange forward contracts 3.0 — 3.0 — Derivatives – interest rate hedge-non-current 3.7 — 3.7 Funds in investments and other assets: Israeli pension assets 19.3 — 19.3 — Deferred compensation plan assets: Mutual funds and exchange traded funds 1.6 — 1.6 — Total assets $ 342.5 $ 44.7 $ 297.8 $ — Liabilities: Derivatives –foreign exchange forward contracts $ 0.7 $ — $ 0.7 $ — Derivatives – interest rate hedge – non-current 7.5 — 7.5 — Total liabilities $ 8.2 $ — $ 8.2 $ — Reported as follows: Assets: Cash equivalents $ 62.3 $ 62.2 $ 0.1 $ — Short-term investments 246.2 — 246.2 — Other current assets 3.0 — 3.0 — Total current assets $ 311.5 $ 62.2 $ 249.3 $ — Long-term investments $ 6.4 $ — $ 6.4 $ — Other assets 24.6 — 24.6 — Total long-term assets $ 31.0 $ — $ 31.0 $ — Liabilities: Other current liabilities $ 0.7 $ — $ 0.7 $ — Other liabilities $ 7.5 $ — $ 7.5 $ — Assets and liabilities of the Company are measured at fair value on a recurring basis as of December 31, 2020 and are summarized as follows: Fair Value Measurements at Reporting Date Using Description December 31, 2020 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Cash equivalents: Money market funds $ 1.3 $ 1.3 $ — $ — Commercial paper 0.3 — 0.3 — U.S. treasury obligations 62.1 — 62.1 — Available-for-sale investments: Time deposits and certificates of deposit 0.7 — 0.7 — Bankers' acceptance drafts 3.8 — 3.8 — U.S. treasury obligations 223.2 — 223.2 — Group insurance contracts 6.5 — 6.5 — Funds in investments and other assets: Israeli pension assets 18.8 — 18.8 — Deferred compensation plan assets: Mutual funds and exchange traded funds 1.7 — 1.7 — Total assets $ 318.4 $ 1.3 $ 317.1 $ — Liabilities: Derivatives – foreign exchange forward contracts $ 6.5 $ — $ 6.5 $ — Derivatives – interest rate hedge - non-current 14.0 — 14.0 — Total liabilities $ 20.5 $ — $ 20.5 $ — Reported as follows: Assets: Cash equivalents $ 63.7 $ 1.3 $ 62.4 $ — Short-term investments 227.7 — 227.7 — Total current assets $ 291.4 $ 1.3 $ 290.1 $ — Long-term investments $ 6.5 $ — $ 6.5 $ — Other assets 20.5 — 20.5 — Total long-term assets $ 27.0 $ — $ 27.0 $ — Liabilities: Other current liabilities $ 6.5 $ — $ 6.5 $ — Other liabilities $ 14.0 $ — $ 14.0 $ — Money Market Funds Money market funds are cash equivalents and are classified within Level 1 of the fair value hierarchy. Available-For-Sale Investments The Company measures its debt and equity investments at fair value. The Company’s available-for-sale investments are classified within Level 2 of the fair value hierarchy. Israeli Pension Assets Israeli pension assets represent investments in mutual funds, government securities and other time deposits. These investments are set aside for the retirement benefit of the employees of the Company’s Israeli subsidiaries. These funds are classified within Level 2 of the fair value hierarchy. Derivatives As a result of the Company’s global operating activities, the Company is exposed to market risks from changes in foreign currency exchange rates and variable interest rates, which may adversely affect its operating results and financial position. When deemed appropriate, the Company minimizes its risks from foreign currency exchange rate and interest rate fluctuations through the use of derivative financial instruments. The principal market in which the Company executes its foreign currency contracts and interest rate swaps is the institutional market in an over-the-counter environment with a relatively high level of price transparency. The market participants are typically large commercial banks. The foreign exchange forward contracts and interest rate hedges are valued using broker quotations or market transactions and are classified within Level 2 of the fair value hierarchy.

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2021
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives	6 ) Derivatives The Company enters into derivative instruments for risk management purposes only, including derivatives designated as hedging instruments and those utilized as economic hedges. The Company operates internationally and, in the normal course of business, is exposed to fluctuations in interest rates and foreign exchange rates. These fluctuations can increase the costs of financing, investing and operating the business. The Company has used derivative instruments, such as foreign exchange forward contracts, to manage certain foreign currency exposure, and interest rate swaps to manage interest rate exposure. By nature, all financial instruments involve market and credit risks. The Company enters into derivative instruments with major investment grade financial institutions, for which no collateral is required. The Company has policies to monitor the credit risk of these counterparties. While there can be no assurance, the Company does not anticipate any material non-performance by any of these counterparties. Foreign Exchange Forward Contracts The Company hedges a portion of its forecasted foreign currency-denominated intercompany sales of inventory, over a maximum period of eighteen months, using foreign exchange forward contracts accounted for as cash-flow hedges related to British, Euro, Japanese, South Korean and Taiwanese currencies. To the extent these derivatives are effective in off-setting the variability of the hedged cash flows, and otherwise meet the hedge accounting criteria, changes in the derivatives’ fair value are not included in current earnings but are included in other comprehensive income (“OCI”) in stockholders’ equity. These changes in fair value will subsequently be reclassified into earnings, as applicable, when the forecasted transaction occurs. To the extent that a previously designated hedging transaction is no longer an effective hedge, any ineffectiveness measured in the hedging relationship is recorded in earnings in the period it occurs. The cash flows resulting from foreign exchange forward contracts are classified in the condensed consolidated statements of cash flows as part of cash flows from operating activities. The Company does not enter into derivative instruments for trading or speculative purposes. In conjunction with the acquisition of Photon Control Inc., a Canada corporation (“Photon Control”), which closed in July 2021, the Company entered into a foreign currency contract to hedge the Canadian dollar purchase price. For the three and nine months ended September 30, 2021, the Company recorded a fair value loss of $2.8 and $10.3, respectively, which is included in other expense, net. As of September 30, 2021 and December 31, 2020, the Company had outstanding foreign exchange forward contracts with gross notional values of $207.6 and $176.2, respectively. The following tables provide a summary of the primary net hedging positions and corresponding fair values held as of September 30, 2021 and December 31, 2020: September 30, 2021 Currency Hedged (Buy/Sell) Gross Notional Value Fair Value (1) U.S. dollar/Japanese yen $ 51.5 $ 0.9 U.S. dollar/South Korean won 81.2 1.4 U.S. dollar/euro 14.4 0.1 U.S. dollar/U.K. pound sterling 6.9 — U.S. dollar/Taiwan dollar 53.6 (0.1 ) Total $ 207.6 $ 2.3 December 31, 2020 Currency Hedged (Buy/Sell) Gross Notional Value Fair Value (1) U.S. dollar/Japanese yen $ 61.5 $ (1.1 ) U.S. dollar/South Korean won 62.2 (3.1 ) U.S. dollar/euro 13.1 (0.6 ) U.S. dollar/U.K. pound sterling 6.1 (0.3 ) U.S. dollar/Taiwan dollar 33.3 (1.4 ) Total $ 176.2 $ (6.5 ) (1) Represents receivable (payable) amount included in the condensed consolidated balance sheet. Interest Rate Swap Agreements The Company entered into various interest rate swap agreements that exchange the variable LIBOR interest rate to a fixed rate in order to manage the exposure to interest rate fluctuations associated with the variable LIBOR interest rate paid on the outstanding balance of the Term Loan Facility, as defined and further described in Note 10. The table below summarizes the various interest rate hedges entered into by the Company: September 30, 2021 September 30, 2021 December 31, 2020 Swap Trade Date Effective Date Maturity Fixed Rate Notional Amount at Effective Date Notional Amount Fair Value Asset (Liability) Fair Value Asset (Liability) 1 April 3, 2019 April 5, 2019 March 31, 2023 2.309 % $ 300.0 $ 300.0 (7.5 ) (12.4 ) 2 October 29, 2020 October 26, 2021 February 28, 2025 0.485 % $ 200.0 $ — 2.3 (0.7 ) 3 October 29, 2020 March 31, 2022 February 28, 2025 0.623 % $ 100.0 $ — 1.4 (0.9 ) Total $ (3.8 ) $ (14.0 ) The interest rate swaps are recorded at fair value on the balance sheet and changes in the fair value are recognized in OCI. To the extent that these arrangements are no longer effective hedges, any ineffectiveness measured in the hedging relationships is recorded immediately in earnings in the period it occurs. The following table provides a summary of the fair value amounts of the Company’s derivative instruments: Derivatives Designated as Hedging Instruments September 30, 2021 December 31, 2020 Derivative assets: Foreign exchange forward contracts (1) $ 3.0 $ — Interest rate hedges (2) 3.7 — Derivative liabilities: Foreign exchange forward contracts (1) (0.7 ) (6.5 ) Interest rate hedge (2) (7.5 ) (14.0 ) Total net derivative liability designated as hedging instruments $ (1.5 ) $ (20.5 ) (1) The derivative asset of $3.0 and derivative liability of $0.7 related to the foreign exchange forward contracts are classified in other current assets and other current liabilities in the condensed consolidated balance sheet as of September 30, 2021. The derivative liability of $6.5 related to the foreign exchange forward contracts is classified in other current liabilities in the condensed consolidated balance sheet as of December 31, 2020. These foreign exchange forward contracts are subject to a master netting agreement with one financial institution. However, the Company has elected to record these contracts on a gross basis in the balance sheet. (2) The interest rate hedge asset of $3.7 is classified in other non-current assets in the condensed consolidated balance sheet as of September 30, 2021. The interest rate hedge liabilities of $7.5 and $14.0 are classified in other non-current liabilities in the condensed consolidated balance sheet as of September 30, 2021 and December 31, 2020, respectively. The net amount of existing gains as of September 30, 2021 that is expected to be reclassified from OCI into earnings within the next 12 months is immaterial. The following table provides a summary of the gains (losses) on derivatives designated as cash flow hedging instruments: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Forward exchange forward contracts: Net (loss) gain recognized in accumulated OCI (1) $ 3.0 $ (0.6 ) $ 13.9 $ (7.7 ) Net (loss) gain reclassified from accumulated OCI into income (2) $ (0.2 ) $ 0.4 $ (2.1 ) $ 2.2 (1) Net change in the fair value of the effective portion classified in accumulated OCI. (2) Effective portion classified in cost of products for the three and nine months ended September 30, 2021 and 2020. The tax effect of the gains or losses reclassified from accumulated OCI into income is immaterial. The following table provides a summary of the losses on derivatives not designated as hedging instruments: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Foreign exchange forward contracts: Net loss recognized in income (1) $ (2.2 ) $ (0.6 ) $ (9.0 ) $ (0.6 ) (1) The Company enters into foreign exchange forward contracts to hedge against changes in the balance sheet for certain subsidiaries to mitigate the risk associated with certain foreign currency transactions in the ordinary course of business. In conjunction with the acquisition of Photon Control, the Company entered into a foreign currency contract to hedge the Canadian dollar purchase price. These derivatives are not designated as hedging instruments and gains or losses from these derivatives are recorded in other (expense) income in the periods in which they occur.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2021
Inventory Disclosure [Abstract]
Inventories	7 ) Inventories Inventories consist of the following: September 30, 2021 December 31, 2020 Raw materials $ 365.9 $ 321.3 Work-in-process 84.9 76.7 Finished goods 99.6 103.4 $ 550.4 $ 501.4

Leases

Leases	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Leases	8 ) Leases The Company has various operating leases for real estate and non-real estate items. The non-real estate leases are mainly comprised of automobiles but also include office equipment and other lower-valued items. The Company does not have any finance leases. As most of the Company’s leases do not provide an implicit rate, an incremental borrowing rate is used based on the estimated rate of interest for collateralized borrowing over a similar term of the lease payments at commencement date. Some of the Company’s real estate lease agreements include Company options to either extend and/or terminate the lease. The cost of these options is included in our operating lease liabilities to the extent that such options are reasonably certain of being exercised. Leases with renewal options allow the Company to extend the lease term typically between 1 to 10 years. When determining the lease term, renewal options reasonably certain of being exercised are included in the lease term. When determining if a renewal option is reasonably certain of being exercised, the Company considers several economic factors, including but not limited to, the significance of leasehold improvements made to the property, whether the physical space is difficult to replace, underlying contractual obligations, and specific characteristics unique to that particular lease that would make it reasonably certain that the Company would exercise such an option. The Company has existing leases that include variable lease and non-lease components that are not included in the right-of-use asset and lease liability and are reflected as expenses in the periods incurred. Such payments primarily include common area maintenance charges and increases in rent payments that are driven by factors such as future changes in an index (e.g., the Consumer Price Index). The elements of lease expense were as follows: Three Months Ended September 30, 2021 2020 Lease cost: Operating lease cost (1) $ 6.6 $ 7.2 Short-term lease 1.2 1.4 Total lease cost $ 7.8 $ 8.6 Nine Months Ended September 30, 2021 2020 Lease cost: Operating lease cost (1) $ 20.7 $ 22.1 Short-term lease 3.4 3.7 Total lease cost $ 24.1 $ 25.8 (1) Operating lease cost includes an immaterial amount of variable expenses and sublease rental income. The weighted average discount rate and the weighted average remaining lease term were 2.9% and 14.4 years, respectively, as of September 30, 2021. The weighted average discount rate and weighted average remaining lease term were 3.0% and 15.0 years, respectively, as of September 30, 2020. Operating cash flows used for operating leases for the nine months ended September 30, 2021 and 2020 were $11.6 and $15.4, respectively. Operating cash flows used for operating leases for the nine months ended September 30, 2021 of $11.6 was net of $5.0 in tenant improvement allowance receipts. Future lease payments under non-cancelable leases as of September 30, 2021 are detailed as follows: 2021 (remaining) $ 4.8 2022 24.1 2023 21.0 2024 19.5 2025 18.1 Thereafter 172.3 Total lease payments 259.8 Less: imputed interest 49.5 Total operating lease liabilities $ 210.3 The remaining 2021 lease payment amount of $4.8 is net of tenant improvement allowances of $1.3. Amounts presented above do not include payments relating to immaterial leases excluded from the balance sheet as these operating leases had terms of less than twelve months.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	9 ) Goodwill and Intangible Assets Goodwill The Company’s methodology for allocating the purchase price relating to purchase acquisitions is determined through established and generally accepted valuation techniques. Goodwill is measured as the excess of the cost of the acquisition over the sum of the amounts assigned to tangible and identifiable intangible assets acquired less liabilities assumed. The Company assigns assets acquired (including goodwill) and liabilities assumed to one or more reporting units as of the date of acquisition. Typically acquisitions relate to a single reporting unit and thus do not require the allocation of goodwill to multiple reporting units. If the products obtained in an acquisition are assigned to multiple reporting units, the goodwill is distributed to the respective reporting units as part of the purchase price allocation process. Goodwill and purchased intangible assets with indefinite useful lives are not amortized but are reviewed for impairment annually during the fourth quarter of each fiscal year and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. The process of evaluating the potential impairment of goodwill and intangible assets requires significant judgment. The Company regularly monitors current business conditions and other factors including, but not limited to, adverse industry or economic trends, restructuring actions and lower projections of profitability that may impact future operating results. The changes in the carrying amount of goodwill and accumulated impairment loss during the nine months ended September 30, 2021 and year ended December 31, 2020 were as follows: Nine Months Ended September 30, 2021 Twelve Months Ended December 31, 2020 Gross Carrying Amount Accumulated Impairment Loss Net Gross Carrying Amount Accumulated Impairment Loss Net Beginning balance at January 1 $ 1,211.8 $ (145.4 ) $ 1,066.4 $ 1,202.8 $ (144.3 ) $ 1,058.5 Acquired goodwill (1) 168.2 — 168.2 — — — Impairment of goodwill (2) — — — — (1.1 ) (1.1 ) Foreign currency translation (8.4 ) — (8.4 ) 9.0 — 9.0 Ending balance at September 30, 2021 and December 31, 2020 $ 1,371.6 $ (145.4 ) $ 1,226.2 $ 1,211.8 $ (145.4 ) $ 1,066.4 (1) During the nine months ended September 30, 2021, the Company recorded goodwill related to the acquisition of Photon Control. (2) During the twelve months ended December 31, 2020, the Company recorded $1.1 of goodwill impairment charges related to the pending closure of a facility in Europe. Intangible Assets Components of the Company’s intangible assets are comprised of the following: As of September 30, 2021: Gross Accumulated Impairment Charges Accumulated Amortization Foreign Currency Translation Net Completed technology (1) $ 556.4 $ (0.1 ) $ (232.2 ) $ (2.4 ) $ 321.7 Customer relationships (1) 317.6 (1.4 ) (119.6 ) 0.1 196.7 Patents, trademarks, trade names and other (1) 122.5 — (51.5 ) 0.1 71.1 $ 996.5 $ (1.5 ) $ (403.3 ) $ (2.2 ) $ 589.5 (1) During the three months ended September 30, 2021, the Company recorded $121.0 of separately identified intangible assets related to the acquisition of Photon Control, of which $110.0 was completed technology, $9.4 was customer relationships and $1.6 was patents, trademarks, trade names and other. As of December 31, 2020: Gross Accumulated Impairment Charges Accumulated Amortization Foreign Currency Translation Net Completed technology $ 446.4 $ (0.1 ) $ (209.8 ) $ (0.1 ) $ 236.4 Customer relationships 308.2 (1.4 ) (104.8 ) 1.7 203.7 Patents, trademarks, trade names and other 120.9 — (48.6 ) (0.2 ) 72.1 $ 875.5 $ (1.5 ) $ (363.2 ) $ 1.4 $ 512.2 Aggregate amortization expense related to acquired intangible assets for the nine months ended September 30, 2021 and 2020 was $40.1 and $42.6, respectively. Aggregate net amortization expense related to acquired intangible assets for future years is as follows: Year Amount 2021 (remaining) $ 15.2 2022 59.7 2023 58.2 2024 57.3 2025 56.4 2026 52.8 Thereafter 234.0 The Company excluded $55.9 of indefinite-lived trademarks and trade names that were not subject to amortization from the table above.

Debt

Debt	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Debt	1 0 ) Debt The Company’s outstanding debt is as follows: September 30, 2021 December 31, 2020 Short-term debt: Term Loan Facility $ 9.0 $ 9.0 Japanese lines of credit and financing facility — 5.5 $ 9.0 $ 14.5 September 30, 2021 December 31, 2020 Long-term debt: Term Loan Facility, net (1) $ 809.7 $ 815.0 (1) Net of deferred financing fees, original issuance discount and repricing fees in the aggregate of $8.0 and $9.4 as of September 30, 2021 and December 31, 2020, respectively. The Company recognized interest expense of $6.3 and $19.1 for the three and nine months ended September 30, 2021, respectively, and $6.6 and $22.7 for the three and nine months ended September 30, 2020, respectively. Senior Secured Term Loan Credit Facility In connection with the completion of the acquisition of Newport Corporation (“Newport”) in 2016 (the “Newport Merger”), the Company entered into a term loan credit agreement (as amended, the “Term Loan Credit Agreement”) with Barclays Bank PLC, as administrative agent and collateral agent, and the lenders from time to time party thereto, which provided a senior secured term loan credit facility (the “Term Loan Facility”) in the original principal amount of $780.0. The Company has entered into seven amendments to the Term Loan Credit Agreement since 2016, including most recently the May Term Loan Amendment (as defined below). The Term Loan Facility is subject to increase at the Company’s option and subject to receipt of lender commitments in accordance with the Term Loan Credit Agreement. The maturity date of the Term Loan Facility is February 2, 2026 . As of September 30, 2021, borrowings under the Term Loan Facility​​​​​​​ bear interest per annum at one of the following rates selected by the Company: (a) a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50 %, (2) the “prime rate” quoted in The Wall Street Journal , (3) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs, plus 1.00 %, and (4) a floor of 1.00 %, plus, in each case, an applicable margin of 0.75 %; or (b) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, subject to a LIBOR rate floor of 0.0 %, plus an applicable margin of 1.75 %. The Company has elected the interest rate as described in clause (b) of the foregoing sentence. The Term Loan Credit Agreement provides that, unless an alternate rate of interest is agreed, all loans will be determined by reference to the base rate if the LIBOR rate cannot be ascertained, if regulators impose material restrictions on the authority of a lender to make LIBOR rate loans, or for other reasons. In May 2021, the Company entered into an amendment (the “May Term Loan Amendment”) to the Term Loan Credit Agreement. The May Term Loan Amendment amends the Term Loan Facility to, among other things, (i) increase the Company’s ability to incur additional incremental debt facilities to (x) the greater of (1) $600.0 and (2) 100% of consolidated EBITDA, plus (y) an amount equal to the sum of all voluntary prepayments of term loans under the Term Loan Facility, plus (z) an additional unlimited amount subject to pro forma compliance with a secured leverage ratio test of 3.25:1.00, and (ii) increase the Company’s flexibility under certain debt, lien, investment, restricted payment and disposition baskets. The fees incurred, including certain customary lender consent fees, in connection with the were immaterial. As of September 30, 2021, the Company has incurred an aggregate amount of $42.6 of deferred finance fees, original issue discount and repricing fees related to the term loans under the Term Loan Facility, which are included in long-term debt in the accompanying condensed consolidated balance sheets and are being amortized to interest expense over the estimated life of the term loans using the effective interest method. As of September 30, 2021, the remaining balance of deferred finance fees, original issue discount and repricing fees related to the term loans under the Term Loan Facility was $8.0. A portion of the deferred finance fees, original issue discount and repricing fees have been accelerated in connection with the various debt prepayments and amendments between 2016 and 2021. The Company is required to make scheduled quarterly amortization payments each equal to 0.25% of the original principal amount of the Term Loan Facility. As of September 30, 2021, after giving effect to all amendments and repayments prior to such date, the outstanding principal amount of the Term Loan Facility was $826.7, and the interest rate was 1.8%. Under the Term Loan Credit Agreement, the Company is required to prepay outstanding term loans, subject to certain exceptions, with portions of its annual excess cash flow as well as with the net cash proceeds of certain of its asset sales, certain casualty and condemnation events and the incurrence or issuance of certain debt. All obligations under the Term Loan Facility are guaranteed by certain of the Company’s domestic subsidiaries and are secured by substantially all of the Company’s assets and the assets of such subsidiaries, subject to certain exceptions and exclusions. The Term Loan Credit Agreement contains customary representations and warranties, affirmative and negative covenants and provisions relating to events of default. If an event of default occurs, the lenders under the Term Loan Facility will be entitled to take various actions, including the acceleration of amounts due under the Term Loan Facility and all actions generally permitted to be taken by a secured creditor. At September 30, 2021, the Company was in compliance with all covenants under the Term Loan Credit Agreement. Interest Rate Swap Agreements The Company entered into various interest rate swap agreements as described further in Note 6 that exchange the variable LIBOR interest rate to a fixed rate in order to manage the exposure to interest rate fluctuations associated with the variable LIBOR interest rate paid on the outstanding balance of the Term Loan Facility. Senior Secured Asset-Based Revolving Credit Facility In February 2019, in connection with the completion of the acquisition of Electro Scientific Industries, Inc. (the “ESI Merger”), the Company entered into an asset-based revolving credit agreement with Barclays Bank PLC, as administrative agent and collateral agent, the other borrowers from time to time party thereto, and the lenders and letters of credit issuers from time to time party thereto (the “ABL Credit Agreement”), that provides a senior secured asset-based revolving credit facility of up to $100.0, subject to a borrowing base limitation (the “ABL Facility”). The Company has entered into two amendments to the ABL Credit Agreement since 2019. As of September 30, 2021, after giving effect to all amendments, the borrowing base for the ABL Facility at any time equals the sum of: (a) 85% of certain eligible accounts; plus (b) prior to certain notice and field examination and appraisal requirements, the lesser of (i) 20% of net book value of eligible inventory in the United States and (ii) 30% of the borrowing base, and after the satisfaction of such requirements, the lesser of (i) the lesser of (A) 65% of the lower of cost or market value of certain eligible inventory and (B) 85% of the net orderly liquidation value of certain eligible inventory and (ii) 30% of the borrowing base; minus (c) reserves established by the administrative agent, in each case, subject to additional limitations and examination requirements for eligible accounts and eligible inventory acquired in an acquisition after February 1, 2019. The ABL Facility includes borrowing capacity in the form of letters of credit up to $25.0. The Company has not borrowed against the ABL Facility to date. As of September 30, 2021, borrowings under the ABL Facility bear interest at a rate per annum equal to, at the Company’s option, any of the following, plus, in each case, an applicable margin: (a) a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50%, (2) the “prime rate” quoted in The Wall Street Journal In addition to paying interest on any outstanding principal under the ABL Facility, the Company is required to pay a commitment fee in respect of the unutilized commitments thereunder equal to 0.25% per annum. The Company must also pay customary letter of credit fees and agency fees. Under the ABL Facility, the Company is required to prepay amounts outstanding under the ABL Facility (1) if amounts outstanding under the ABL Facility exceed the lesser of (a) the commitment amount and (b) the borrowing base, in an amount required to reduce such shortfall, (2) if amounts outstanding under the ABL Facility in any currency other than U.S. dollars exceed the sublimit for such currency, in an amount required to reduce such shortfall, and (3) during any period in which the Company has excess availability less than the greater of (a) 10.0% of the lesser of (x) the commitment amount and (y) the borrowing base (the “Line Cap”) and (b) $8.5 for 3 consecutive business days, until the time when the Company has excess availability equal to or greater than the greater of (A) 10.0% of the Line Cap and (B) $8.5 for 30 consecutive days, or during the continuance of an event of default, with immediately available funds in its blocked accounts. There is no scheduled amortization under the ABL Facility. Any principal amount outstanding under the ABL Facility is due and payable in full on the fifth anniversary of the closing date, subject to a springing maturity in the event that term loans under the Term Loan Facility in an aggregate amount of at least $100.0 have an earlier maturity date than the ABL Facility. All obligations under the ABL Facility are guaranteed by certain of the Company’s domestic subsidiaries and are secured by substantially all of the Company’s assets and the assets of such subsidiaries, subject to certain exceptions and exclusions. From the time when the Company has excess availability less than the greater of (a) 10.0% of the Line Cap and (b) $8.5 until the time when the Company has excess availability equal to or greater than the greater of (a) 10.0% of the Line Cap and (b) $8.5 for 30 consecutive days, or during the continuance of an event of default, the ABL Credit Agreement requires the Company to maintain a fixed charge coverage ratio, tested on the last day of each fiscal quarter, of at least 1.0 to 1.0. The ABL Credit Agreement also contains customary representations and warranties, affirmative covenants and provisions relating to events of default. If an event of default occurs, the lenders under the ABL Facility will be entitled to take various actions, including the acceleration of amounts due under the ABL Facility and all actions permitted to be taken by a secured creditor. Lines of Credit and Borrowing Arrangements The Company’s Japanese subsidiaries have lines of credit and a financing facility with various financial institutions, many of which generally expire and are renewed at three-month Contractual maturities of the Company’s debt obligations as of September 30, 2021 are as follows: Year Amount 2021 (remaining) $ 2.2 2022 9.0 2023 9.0 2024 9.0 2025 9.0 2026 788.5

Product Warranties

Product Warranties	9 Months Ended
	Sep. 30, 2021
Guarantees And Product Warranties [Abstract]
Product Warranties	1 1 ) Product Warranties The Company provides for the estimated costs to fulfill customer warranty obligations upon the recognition of the related revenue. While the Company engages in extensive product quality programs and processes, including actively monitoring and evaluating the quality of its component suppliers, the Company’s warranty obligations are affected by shipment volume, product failure rates, utilization levels, material usage and supplier warranties on parts delivered to the Company. Should actual product failure rates, utilization levels, material usage, or supplier warranties on parts differ from the Company’s estimates, revisions to the estimated warranty liability would be required. Product warranty activities were as follows: Nine Months Ended September 30, 2021 2020 Beginning of period $ 18.4 $ 14.9 Provision for product warranties 30.4 20.2 Charges to warranty liability (26.0 ) (19.0 ) End of period (1) $ 22.8 $ 16.1 (1) As of September 30, 2021, short-term product warranties of $21.7 and long-term product warranties of $1.1 were included within other current liabilities and other non-current liabilities, respectively, within the accompanying condensed consolidated balance sheet. As of September 30, 2020, short-term product warranties of $13.0 and long-term product warranties of $3.1 were included within other current liabilities and other non-current liabilities, respectively, within the accompanying condensed consolidated balance sheet.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	1 2 ) Income Taxes The Company’s effective tax rates for the three and nine months ended September 30, 2021 were 20.4% and 17.6%, respectively. The effective tax rates for the three and nine months ended September 30, 2021 and related income tax expense, were lower than the U.S. statutory tax rate mainly due to the U.S. deduction for foreign derived intangible income, windfall benefits from stock compensation, and the geographic mix of income earned by the Company’s international subsidiaries being taxed at rates lower than the U.S. statutory tax rate, offset by the U.S. global intangible low-taxed income inclusion and additional withholding taxes on inter-company distributions due to the United Kingdom’s withdrawal from the European Union . The Company’s effective tax rates for the three and nine months ended September 30, 2020 were 15.7% and 17.0%, respectively. The effective tax rates for the three and nine months ended September 30, 2020, and related income tax expense , w ere lower than the U.S. statutory tax rate mainly due to the geographic mix of income earned by the Company’s international subsidiaries being taxed at rates lower than the U.S. statutory tax rate, benefits of stock compensation, and the U.S. deduction for foreign derived intangible income offset by the U.S. tax effects of the U.S. global intangible low - taxed income inclusion and the write-off of deferred tax assets related to certain foreign net operating losses. As of September 30, 2021 and December 31, 2020, the total amount of gross unrecognized tax benefits, which excludes interest and penalties, was $47.3 and $47.0, respectively. The Company accrues interest expense, and if applicable, penalties, for any uncertain tax positions. Interest and penalties are classified as a component of income tax expense. As of September 30, 2021 and December 31, 2020, the Company had accrued interest on unrecognized tax benefits of approximately $0.9 and $0.7, respectively. Over the next 12 months it is reasonably possible that the Company may recognize approximately $3.8 of previously net unrecognized tax benefits, excluding interest and penalties, related to various U.S. federal and foreign tax positions, primarily as a result of the expiration of certain statutes of limitations. The Company and its subsidiaries are subject to examination by U.S. federal, state and foreign tax authorities. The U.S. federal statute of limitations remains open for tax years 2017 through the present. The statute of limitations for the Company’s tax filings in other jurisdictions varies between fiscal years 2015 through present. The Company has certain federal credit carryforwards and state tax loss and credit carryforwards that are open to examination for tax years 2000 through the present.

Net Income Per Share

Net Income Per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Net Income Per Share	1 3 ) Net Income Per Share The following table sets forth the computation of basic and diluted net income per share: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Numerator: Net income $ 132.4 $ 91.7 $ 401.2 $ 234.5 Denominator: Shares used in net income per common share – basic 55.5 55.2 55.4 55.1 Effect of dilutive securities: Restricted stock units and stock appreciation rights 0.2 0.2 0.3 0.2 Shares used in net income per common share – diluted 55.7 55.4 55.7 55.3 Net income per common share: Basic $ 2.39 $ 1.66 $ 7.24 $ 4.26 Diluted $ 2.38 $ 1.66 $ 7.21 $ 4.24 Basic earnings per share (“EPS”) is computed by dividing income available to common stockholders by the weighted-average number of common shares outstanding during the period. The computation of diluted EPS is similar to the computation of basic EPS except that the denominator is increased to include the number of additional common shares that would have been outstanding (using the treasury stock method) if securities containing potentially dilutive common shares (restricted stock units (“RSUs”) and stock appreciation rights (“SARs”)) had been converted to such common shares, and if such assumed conversion is dilutive. For the three and nine months ended September 30, 2021, there were 0.1 weighted-average restricted stock units that would have had an anti-dilutive effect on EPS and were excluded from the computation of diluted weighted-average shares. For the three and nine months ended September 30, 2020, there were no weighted-average restricted stock units that had an anti-dilutive effect on EPS and were excluded from the computation of diluted weighted-average shares.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	1 4 ) Stock-Based Compensation The Company grants RSUs to employees and directors under the 2014 Stock Incentive Plan (the “2014 Plan”). The 2014 Plan is administered by the Compensation Committee of the Company’s Board of Directors. The 2014 Plan is intended to attract and retain employees and directors, and to provide an incentive for these individuals to assist the Company to achieve long-range performance goals and to enable these individuals to participate in the long-term growth of the Company. The total stock-based compensation expense included in the Company’s condensed consolidated statements of operations and comprehensive income was as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Cost of revenues $ 0.9 $ 1.2 $ 2.8 $ 3.1 Research and development 1.1 1.0 3.3 3.0 Selling, general and administrative 6.9 5.1 21.7 15.9 Acquisition and integration costs — 0.1 — 0.7 Total pre-tax stock-based compensation expense $ 8.9 $ 7.4 $ 27.8 $ 22.7 At September 30, 2021, the total compensation expense related to unvested stock-based awards granted to employees and directors under the 2014 Plan that had not been recognized was $43.5. The Company determines the fair value of RSUs based on the closing market price of the Company’s common stock on the date of the award and estimates the fair value of SARs and employee stock purchase plan rights using the Black-Scholes valuation model. Such values are recognized as expense on a straight-line basis for time-based awards and using the accelerated graded vesting method for performance-based awards, both over the requisite service periods. The following table presents the activity for RSUs under the 2014 Plan: Nine Months Ended September 30, 2021 Outstanding RSUs Weighted Average Grant Date Fair Value RSUs – beginning of period 0.6 $ 93.26 Granted 0.2 $ 177.91 Vested (0.3 ) $ 95.47 RSUs – end of period 0.5 $ 127.31 The Company had an immaterial amount of SARs outstanding as of September 30, 2021 and December 31, 2020.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2021
Federal Home Loan Banks [Abstract]
Stockholders' Equity	1 5 ) Stockholders’ Equity Share Repurchase Program On July 25, 2011, the Company’s Board of Directors approved a share repurchase program for the repurchase of up to an aggregate of $200 of its outstanding common stock from time to time in open market purchases, privately negotiated transactions or through other appropriate means. The timing and quantity of any shares repurchased depends upon a variety of factors, including business conditions, stock market conditions and business development activities, including, but not limited to, merger and acquisition opportunities. These repurchases may be commenced, suspended or discontinued at any time without prior notice. The Company has repurchased approximately 2.6 shares of common stock for approximately $127 pursuant to the program since its adoption. During the three and nine months ended September 30, 2021 and 2020, there were no repurchases of common stock. Cash Dividends Holders of the Company’s common stock are entitled to receive dividends when they are declared by the Company’s Board of Directors. In addition, the Company accrues dividend equivalents on the RSUs the Company assumed in the ESI Merger when dividends are declared by the Company’s Board of Directors. During the first quarter of 2021, the Company’s Board of Directors declared a cash dividend of $0.20 per share. During each of the second and third quarters of 2021, the Company’s Board of Directors declared a cash dividend of $0.22 per share. The total amount of the dividends declared in 2021 was $ 35.5 , or $ per share . During each of the first , second and third quarters of 2020 , t he Company’s Board of Directors declared a cash dividend of $ 0.20 per share , which totaled $ , or $ per share . On October 25, 2021, the Company’s Board of Directors declared a quarterly cash dividend of $0.22 per share to be paid on December 10, 2021 to stockholders of record as of November 29, 2021. Future dividend declarations, if any, as well as the record and payment dates for such dividends, are subject to the final determination of the Company’s Board of Directors. In addition, under the Term Loan Facility and ABL Facility, the Company may be restricted from paying dividends under certain circumstances.

Acquisition

Acquisition	9 Months Ended
	Sep. 30, 2021
Business Combinations [Abstract]
Acquisition	16) Acquisition Photon Control On July 15, 2021, the Company completed its acquisition of Photon Control (the “Photon Control Acquisition”), pursuant to a definitive agreement (the “Arrangement Agreement”). Photon Control designs, manufactures and distributes a wide range of optical sensors and systems to measure temperature and position used in semiconductor wafer fabrication. At the effective time of the Photon Control Acquisition and pursuant to the terms and conditions of the Arrangement Agreement, each share of Photon Control’s common stock issued and outstanding as of immediately prior to the effective time of the Photon Control Acquisition, was converted into the right to receive CAD 3.60 per share in cash, without interest and subject to deduction for any required withholding tax. The Company paid to the former Photon Control securityholders aggregate consideration of CAD 378.6, or USD 302.7, excluding related transaction fees and expenses. The Company funded the payment of the aggregate consideration with available cash on hand. Photon Control is included in the Company’s Light & Motion segment. The purchase price of Photon Control consisted of the following: Cash paid for outstanding shares (1) $ 302.7 Less: Cash and cash equivalents acquired (34.3 ) Total purchase price, net of cash and cash equivalents acquired $ 268.4 (1) Represents cash paid of CAD 3.60 per share for approximately 105.2 shares of Photon Control common stock, without interest and subject to deduction for any required withholding tax. Under the acquisition method of accounting, the total estimated acquisition consideration is allocated to the acquired tangible and intangible assets and assumed liabilities of Photon Control based on their fair values as of the acquisition date. Any excess of the acquisition consideration over the fair value of assets acquired and liabilities assumed is allocated to goodwill. The Company expects that none of this goodwill or intangible assets will be deductible for tax purposes. Surround the Chamber The following table summarizes the preliminary allocation of the purchase price to the fair values assigned to assets acquired and liabilities assumed at the date of the Photon Control Acquisition: Current assets $ 51.4 Intangible assets 121.0 Goodwill 168.2 Other non-current assets 8.6 Total assets acquired 349.2 Current liabilities 13.7 Non-current deferred taxes 32.1 Other long-term liabilities 0.7 Total liabilities assumed 46.5 Fair value of assets acquired and liabilities assumed 302.7 Less: Cash and cash equivalents acquired (34.3 ) Total purchase price, net of cash and cash equivalents acquired $ 268.4 The acquired intangible assets are being amortized on a straight-line basis, which approximates the economic use of the assets over their estimated useful lives. The following table reflects the allocation of the acquired intangible assets and related estimate of useful lives: Completed technology $ 110.0 9 years Customer relationships $ 9.4 10 years Trade names 0.2 0.5 years Backlog 1.4 1.5 years $ 121.0 While the Company uses its best estimates and assumptions as part of the purchase price allocation process to value the assets acquired and liabilities assumed on the acquisition date, its estimates and assumptions are subject to refinement. The net fair value of the acquired intangible assets was determined using the income approach. In performing these valuations, the key underlying judgments and assumptions used included the appropriate discount rates as well as forecasted revenue growth rates, gross profit and operating margins. Fair value estimates are based on a complex series of judgments about future events and uncertainties and rely heavily on estimates and assumptions. The judgments used to determine the estimated fair value assigned to each class of assets acquired and liabilities assumed, as well as asset lives, can materially impact the Company’s results of operations. The finalization of the purchase accounting assessment may result in a change in the valuation of assets acquired and liabilities assumed and may have a material impact on the Company’s results of operations and financial position. As a result, during the measurement period, which may be up to one year from the acquisition date, the Company records adjustments to the assets acquired and liabilities assumed with a corresponding offset to goodwill to reflect additional information received about facts and circumstances which existed at the date of acquisition. The Company records adjustments to the assets acquired and liabilities assumed subsequent to the purchase price allocation period in the Company’s operating results in the period in which the adjustments are determined. Any potential adjustments made could be material in relation to the preliminary values presented. The results of operations of the Photon Control business from the acquisition closing date of July 15, 2021 through September 30, 2021, were not material to the Company's results of operations. The acquisition was also not material to the Company’s results of operations, for the periods presented, on a pro forma basis.

Business Segment, Geographic Ar

Business Segment, Geographic Area, and Significant Customer Information	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Business Segment, Geographic Area, and Significant Customer Information	1 7 ) Business Segment, Geographic Area, and Significant Customer Information The Company is a global provider of instruments, systems, subsystems and process control solutions that measure, monitor, deliver, analyze, power and control critical parameters of advanced manufacturing processes to improve process performance and productivity for its customers. The Company’s products are derived from its core competencies in pressure measurement and control, flow measurement and control, gas and vapor delivery, gas composition analysis, electronic control technology, reactive gas generation and delivery, power generation and delivery, vacuum technology, temperature sensing, lasers, photonics, optics , precision motion control, vibration control and laser-based manufacturing systems solutions. The Company also provides services relating to the maintenance and repair of its products, installation services and training. The Company ’ s primary served markets include semiconductor, industrial technolo gies, life and health sciences, and research and defense. The Company’s Chief Operating Decision Maker (“CODM”), which is the Company’s Chief Executive Officer, utilizes financial information to make decisions about allocating resources and assessing performance for the entire Company, which is used in the decision-making process to assess performance. Reportable Segments The Vacuum & Analysis segment provides a broad range of instruments, components and subsystems which are derived from the Company’s core competencies in pressure measurement and control, flow measurement and control, gas and vapor delivery, gas composition analysis, electronic control technology, reactive gas generation and delivery, power generation and delivery and vacuum technology. The Light & Motion segment provides a broad range of instruments, components and subsystems which are derived from the Company’s core competencies in temperature sensing, lasers, photonics, optics, precision motion control and vibration control. The Equipment & Solutions segment provides a range of products including laser-based systems for printed circuit board (“PCB”) manufacturing, which includes flexible interconnect PCB processing systems and high density interconnect solutions for rigid PCB manufacturing and substrate processing and multi-layer ceramic capacitor test systems. The Company derives its segment results directly from the manner in which results are reported in its management reporting system. The accounting policies that the Company uses to derive reportable segment results are substantially the same as those used for external reporting purposes. The Company groups its similar products within its three reportable segments. The following table sets forth net revenues by reportable segment: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Vacuum & Analysis $ 483.1 $ 361.3 $ 1,376.6 $ 995.1 Light & Motion 208.7 175.9 583.6 507.3 Equipment & Solutions 50.1 52.6 225.5 167.4 $ 741.9 $ 589.8 $ 2,185.7 $ 1,669.8 The following table sets forth a reconciliation of segment gross profit to consolidated net income: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Gross profit by reportable segment: Vacuum & Analysis $ 226.3 $ 163.5 $ 643.8 $ 444.1 Light & Motion 100.6 76.0 272.6 227.8 Equipment & Solutions 21.5 22.5 109.3 76.0 Total gross profit by reportable segment 348.4 262.0 1,025.7 747.9 Operating expenses: Research and development 51.7 42.5 148.9 127.7 Selling, general and administrative 95.8 87.0 288.9 260.3 Acquisition and integration costs 8.6 0.5 20.8 3.4 Restructuring and other 2.0 3.1 9.9 6.8 Amortization of intangible assets 15.0 12.5 40.1 42.6 Asset impairment — — — 1.2 COVID-19 related net credits — — — (1.2 ) Income from operations 175.3 116.4 517.1 307.1 Interest income 0.1 0.1 0.4 1.1 Interest expense 6.3 6.6 19.1 22.7 Other expense, net 2.9 1.1 11.5 3.0 Income before income taxes 166.2 108.8 486.9 282.5 Provision for income taxes 33.8 17.1 85.7 48.0 Net income $ 132.4 $ 91.7 $ 401.2 $ 234.5 The following table sets forth capital expenditures by reportable segment for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Vacuum & Analysis $ 10.8 $ 9.7 $ 27.2 $ 28.8 Light & Motion 8.3 12.9 25.0 21.4 Equipment & Solutions 1.4 6.4 11.1 9.7 Total capital expenditures $ 20.5 $ 29.0 $ 63.3 $ 59.9 The following table sets forth depreciation and amortization by reportable segment for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Vacuum & Analysis $ 5.1 $ 5.1 $ 17.3 $ 15.1 Light & Motion 13.5 9.6 32.3 33.5 Equipment & Solutions 8.8 8.6 26.5 27.2 Total depreciation and amortization $ 27.4 $ 23.3 $ 76.1 $ 75.8 Total income tax expense is not presented by reportable segment because the necessary information is not available nor used by the CODM. The following table sets forth segment assets by reportable segment: September 30, 2021 Vacuum & Analysis Light & Motion Equipment & Corporate, Eliminations & Other Total Segment assets: Accounts receivable $ 292.2 $ 139.1 $ 36.7 $ (24.6 ) $ 443.4 Inventories 317.9 170.9 64.1 (2.5 ) 550.4 Total segment assets $ 610.1 $ 310.0 $ 100.8 $ (27.1 ) $ 993.8 December 31, 2020 Vacuum & Analysis Light & Motion Equipment & Corporate, Eliminations & Other Total Segment assets: Accounts receivable $ 229.1 $ 122.6 $ 51.7 $ (10.7 ) $ 392.7 Inventories 273.3 166.1 63.7 (1.7 ) 501.4 Total segment assets $ 502.4 $ 288.7 $ 115.4 $ (12.4 ) $ 894.1 The following is a reconciliation of segment assets to consolidated total assets: September 30, 2021 December 31, 2020 Total segment assets $ 993.8 $ 894.1 Cash and cash equivalents and short-term investments 879.6 836.0 Other current assets 121.5 74.3 Property, plant and equipment, net 316.8 284.3 Right-of-use assets 184.5 184.4 Goodwill and intangible assets, net 1,815.7 1,578.6 Other assets and long-term investments 54.0 52.1 Consolidated total assets $ 4,365.9 $ 3,903.8 Geographic Area Information about the Company’s operations by geographic area is presented in the tables below. Net revenues from unaffiliated customers are based on the location in which the sale originated. Intercompany sales between geographic areas are at tax transfer prices and have been eliminated from consolidated net revenues. Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Net revenues: United States $ 348.4 $ 281.2 $ 922.7 $ 757.7 South Korea 90.6 65.8 292.6 206.8 China 80.4 67.6 263.5 192.5 Taiwan 44.1 27.8 164.8 73.3 Japan 46.9 39.9 141.2 117.1 Other Asia 74.0 59.4 228.4 175.3 Europe 57.5 48.1 172.5 147.1 $ 741.9 $ 589.8 $ 2,185.7 $ 1,669.8 Long-lived assets: (1) September 30, 2021 December 31, 2020 North America $ 402.4 $ 364.0 Europe 34.5 45.1 Asia 102.1 94.8 $ 539.0 $ 503.9 (1) Long-lived assets include property, plant and equipment, net, right-of-use assets, and certain other assets, and exclude goodwill, intangible assets and long-term tax-related accounts. Goodwill associated with each of the Company’s reportable segments is as follows: September 30, 2021 December 31, 2020 Reportable segment: Vacuum & Analysis $ 195.2 $ 196.2 Light & Motion 556.3 395.3 Equipment & Solutions 474.7 474.9 Total goodwill $ 1,226.2 $ 1,066.4 Major Customers The following customers represented greater than 10% of the Company’s net revenues as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Lam Research Corporation 18.4 % 14.1 % 14.6 % 12.3 % Applied Materials, Inc. 10.6 % 11.0 % 10.7 % 10.8 %

Restructuring and Other

Restructuring and Other	9 Months Ended
	Sep. 30, 2021
Expense Of Restructuring Activities And Other [Abstract]
Restructuring and Other	1 8 ) Restructuring and Other Restructuring The Company recorded restructuring charges of $1.0 and $5.9 during the three and nine months ended September 30, 2021, respectively, primarily related to severance costs due to a global cost saving initiative, costs related to the pending closure of two facilities in Europe and movement of certain products to low cost regions. The Company recorded restructuring charges of $0.4 and $2.0 during the three and nine months ended September 30, 2020, respectively, primarily related to the closure of a facility in Europe and costs related to the exit of certain product groups. Restructuring activities were as follows: Nine Months Ended September 30, 2021 2020 Beginning of period $ 0.3 $ 3.7 Charged to expense 5.9 2.0 Payments and adjustments (5.8 ) (4.4 ) End of period $ 0.4 $ 1.3 Other The Company recorded charges of $1.0 and $4.0 during the three and nine months ended September 30, 2021, respectively, related primarily to duplicate facility costs. The Company recorded charges of $2.7 and $5.4 during the three and nine months ended September 30, 2020, respectively, related to duplicate facility costs. The Company received an insurance reimbursement of $0.5 during the nine months ended September 30, 2020 for costs recorded on a legal settlement from a contractual obligation assumed as part of the Newport Merger.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	1 9 ) Commitments and Contingencies In 2016, two putative class actions lawsuit captioned Dixon Chung v. Newport Corp., et al., Case No. A-16-733154-C, and Hubert C. Pincon v. Newport Corp., et al., Case No. A-16-734039-B, were filed in the District Court, Clark County, Nevada on behalf of a putative class of stockholders of Newport for claims related to the merger agreement (“Newport Merger Agreement”) between the Company, Newport, and a wholly-owned subsidiary of the Company (“Merger Sub”). The lawsuits named as defendants the Company, Newport, Merger Sub, and certain then current and former members of Newport’s board of directors. Both complaints alleged that Newport directors breached their fiduciary duties to Newport’s stockholders by agreeing to sell Newport through an inadequate and unfair process, which led to inadequate and unfair consideration, by agreeing to unfair deal protection devices and by omitting material information from the proxy statement. The complaints also alleged that the Company, Newport and Merger Sub aided and abetted the directors’ alleged breaches of their fiduciary duties. The District Court consolidated the actions, and plaintiffs later filed an amended complaint captioned In re Newport Corporation Shareholder Litigation, Case No. A-16-733154-B, in the District Court, Clark County, Nevada, on behalf of a putative class of Newport’s stockholders for claims related to the Newport Merger Agreement. The amended complaint alleged Newport’s former board of directors breached their fiduciary duties to Newport’s stockholders and that the Company, Newport and Merger Sub had aided and abetted these breaches and sought monetary damages, including pre- and post-judgment interest. In June 2017, the District Court granted defendants’ motion to dismiss and dismissed the amended complaint against all defendants but granted plaintiffs leave to amend. On July 27, 2017, plaintiffs filed a second amended complaint containing substantially similar allegations but naming only Newport’s former directors as defendants. On August 8, 2017, the District Court dismissed the Company and Newport from the action. The second amended complaint seeks monetary damages, including pre- and post-judgment interest. The District Court granted a motion for class certification on September 27, 2018, appointing Mr. Pincon and Locals 302 and 612 of the International Union of Operating Engineers - Employers Construction Industry Retirement Trust as class representatives. On June 11, 2018, plaintiff Dixon Chung was voluntarily dismissed from the litigation. On August 9, 2019, plaintiffs filed a motion for leave to file a third amended complaint, which was denied on October 10, 2019. On August 23, 2019, defendants filed a motion for summary judgment. On January 23, 2020, the District Court entered its findings of fact, conclusions of law, and order granting defendants’ motion for summary judgment. On February 18, 2020, plaintiffs filed a notice of appeal from the District Court’s order granting defendants’ motion for summary judgment, as well as from the District Court’s prior orders granting defendants’ motion for a bench trial and denying plaintiffs’ motion for leave to file an amended complaint. On November 30, 2020, plaintiffs filed their opening brief in the Nevada Supreme Court in support of their appeal from the District Court’s orders. On January 29, 2021, defendants filed their answering brief, and on March 30, 2021, plaintiffs filed their reply brief. The Nevada Supreme Court has scheduled oral argument for December 15, 2021. The Company is also subject to various legal proceedings and claims that have arisen in the ordinary course of business. In the opinion of management, the ultimate disposition of these matters, and the matters noted above, will not have a material adverse effect on the Company’s results of operations, financial condition or cash flows.

Subsequent Events and Pending A

Subsequent Events and Pending Acquisition	9 Months Ended
	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events and Pending Acquisition	20 ) Subsequent Events and Pending Acquisition On July 1, 2021, the Company entered into a definitive agreement (as amended from time to time, the “Implementation Agreement”) to acquire Atotech Limited (“Atotech”), a leading process chemicals technology company and a market leader in advanced electroplating solutions. Pursuant to the Implementation Agreement, the Company agreed to pay $16.20 per share in cash and 0.0552 of a share of MKS common stock for each outstanding common share of Atotech, for total cash and stock consideration of approximately $5,100. The acquisition is expected to close by the end of 2021, subject to the satisfaction of certain closing conditions, including receipt of required regulatory approvals, approval by the Royal Court of Jersey and approval by Atotech’s shareholders. The Company’s obligations to complete the acquisition are not subject to any financing condition. In connection with entering into the Implementation Agreement, the Company entered into (a) a commitment letter (the “Initial Commitment Letter”), dated as of July 1, 2021, with JPMorgan Chase Bank, N.A. and Barclays Bank PLC (collectively, the “Initial Commitment Parties”) and (b) joinders to the Initial Commitment Letter to add certain additional lender parties (the “Commitment Letter Joinders” and, together with the Initial Commitment Letter, the “Commitment Letter”) dated as of July 23, 2021, with the Initial Commitment Parties and the additional lenders party thereto (collectively, the “Supplemental Commitment Parties” and, together with the Initial Commitment Parties, the “Commitment Parties”), pursuant to which, subject to the terms and conditions set forth therein, the Commitment Parties committed to provide (i) a senior secured term loan credit facility in an aggregate principal amount of $5,300 (the “New Term Loan Facility”) and (ii) a senior secured revolving credit facility with aggregate total commitments of $500 (the “New Revolving Credit Facility”). The New Term Loan Facility and New Revolving Credit Facility would refinance the Term Loan Facility and ABL Facility, respectively , and the New Term Loan Facility would be used to finance a portion of the acquisition and to refinance certain existing indebtedness of Atotech . On October 22, 2021, the Company completed the syndication of the New Term Loan Facility, comprised of two tranches: a USD 4,700 loan at LIBOR plus 2.25%, a floor of 0.50% and 0.25% of original issue discount, and a Euro tranche of EUR 500 (approximately USD 600) at EURIBOR plus 2.75%, a floor of 0.00% and 0.25% of original issue discount. The proceeds from the anticipated New Term Loan Facility will be used to finance a portion of the acquisition of Atotech and to repay the existing Term Loan Facility and certain existing indebtedness of Atotech . The Commitment Parties’ obligations under the Commitment Letter and the closing and initial funding under the New Term Loan Facility are subject to certain customary conditions including, without limitation, the consummation of the acquisition of Atotech in accordance with the Implementation Agreement, the accuracy of specified representations and warranties of the Company and other customary closing conditions.

Recently Issued or Adopted Ac_2

Recently Issued or Adopted Accounting Pronouncements (Policies)	9 Months Ended
	Sep. 30, 2021
Accounting Changes And Error Corrections [Abstract]
Recently Issued or Adopted Accounting Pronouncements	In October 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2021-08, "Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers" ("ASU No. 2021-08"). ASU No. 2021-08 will require companies to apply the definition of a performance obligation under ASC Topic 606 to recognize and measure contract assets and contract liabilities (i.e., deferred revenue) relating to contracts with customers that are acquired in a business combination. Under current U.S. GAAP, an acquirer generally recognizes assets acquired and liabilities assumed in a business combination, including contract assets and contract liabilities arising from revenue contracts with customers, at fair value on the acquisition date. ASU No. 2021-08 will result in the acquirer recording acquired contract assets and liabilities on the same basis that would have been recorded by the acquiree before the acquisition under ASC Topic 606. ASU No. 2021-08 is effective for fiscal years beginning after December 15, 2022, with early adoption permitted. The Company is currently evaluating the impact of this ASU on its financial statements. In March 2020, the FASB issued ASU No. 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” This standard provides temporary optional expedients and exceptions to accounting guidance on contract modifications and hedge accounting to ease entities’ financial reporting burdens as the market transitions from the London Interbank Offered Rate (“LIBOR”) and other interbank offered rates to alternative reference rates. The standard was effective upon issuance and generally can be applied through December 31, 2022. In January 2021, the FASB issued ASU 2021-01, “Reference Rate Reform (Topic 848): Scope.” The amendments in this update clarify that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivative instruments that use an interest rate for margining, discounting, or contract price alignment that is modified as a result of reference rate reform. Amendments in this update to the expedients and exceptions in Topic 848 capture the incremental consequences of the scope clarification and tailor the existing guidance to derivative instruments affected by the discounting transition. The amendments in this update do not apply to contract modifications made after December 31, 2022, new hedging relationships entered into after December 31, 2022, and existing hedging relationships evaluated for effectiveness in periods after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that apply certain optional expedients in which the accounting effects are recorded through the end of the hedging relationship (including periods after December 31, 2022). The Company’s adoption of the requirements of these standards has not resulted in a material impact on its financial position, results of operations and cash flows, but the adoption of the requirements may impact the Company in the future. In December 2019, the FASB issued ASU 2019-12, “Income Taxes (Topic 740).” This standard simplifies the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The amendments also improve consistent application and simplify U.S. GAAP for other areas of Topic 740 by clarifying and amending existing guidance. This standard is effective for annual periods , and interim periods within those fiscal years, beginning after December 15, 202 0 . The Company adopted this ASU during the first quarter of 2021 and the adoption of this ASU did no t have a material impact on its financial position, results of operations and cash flows.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue From Contract With Customer [Abstract]
Schedule of Deferred Revenue and Customer Advances by Arrangement	A rollforward of the Company’s deferred revenue and customer advances is as follows: Nine Months Ended September 30, 2021 September 30, 2020 Beginning balance, January 1 (1) $ 36.7 $ 24.8 Additions to deferred revenue and customer advances 68.1 76.3 Amount of deferred revenue and customer advances recognized in income (63.7 ) (65.6 ) Ending balance, September 30 (2) $ 41.1 $ 35.5 (1) Beginning deferred revenue and customer advances as of January 1, 2021 included $18.4 of current deferred revenue, $5.5 of long-term deferred revenue and $12.8 of current customer advances. (2) Ending deferred revenue and customer advances as of September 30, 2021 included $20.0 of current deferred revenue, $3.5 of long-term deferred revenue and $17.6 of current customer advances.
Summary of Revenue from Contracts with Customers	The following table summarizes revenue from contracts with customers: Three Months Ended September 30, 2021 Vacuum & Analysis Light & Motion Equipment & Solutions Total Net revenues: Products $ 425.7 $ 190.8 $ 32.6 $ 649.1 Services 57.4 17.9 17.5 92.8 Total net revenues $ 483.1 $ 208.7 $ 50.1 $ 741.9 Three Months Ended September 30, 2020 Vacuum & Analysis Light & Motion Equipment & Solutions Total Net revenues: Products $ 313.9 $ 156.9 $ 36.0 $ 506.8 Services 47.4 19.0 16.6 83.0 Total net revenues $ 361.3 $ 175.9 $ 52.6 $ 589.8 Nine Months Ended September 30, 2021 Vacuum & Analysis Light & Motion Equipment & Solutions Total Net revenues: Products $ 1,203.7 $ 531.5 $ 175.6 $ 1,910.8 Services 172.9 52.1 49.9 274.9 Total net revenues $ 1,376.6 $ 583.6 $ 225.5 $ 2,185.7 Nine Months Ended September 30, 2020 Vacuum & Analysis Light & Motion Equipment & Solutions Total Net revenues: Products $ 863.5 $ 457.3 $ 120.2 $ 1,441.0 Services 131.6 50.0 47.2 228.8 Total net revenues $ 995.1 $ 507.3 $ 167.4 $ 1,669.8

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2021
Investments Debt And Equity Securities [Abstract]
Gross Unrealized Gains and (Losses) Aggregated by Investment Category	The following tables show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments: As of September 30, 2021: Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value Short-term investments: Time deposits and certificates of deposit $ 24.0 $ — $ — $ 24.0 Bankers’ acceptance drafts 2.5 — — 2.5 Commercial paper 86.2 — — 86.2 Corporate obligations 35.3 — — 35.3 U.S. treasury obligations 98.3 — — 98.3 $ 246.3 $ — $ — $ 246.3 As of September 30, 2021: Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value Long-term investments: Group insurance contracts $ 5.5 $ 0.9 $ — $ 6.4 As of December 31, 2020: Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value Short-term investments: Time deposits and certificates of deposit $ 0.7 $ — $ — $ 0.7 Bankers' acceptance drafts 3.8 — — 3.8 U.S. treasury obligations 223.2 — — 223.2 $ 227.7 $ — $ — $ 227.7 As of December 31, 2020: Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value Long-term investments: Group insurance contracts $ 5.6 $ 0.9 $ — $ 6.5

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis	Assets and liabilities of the Company are measured at fair value on a recurring basis as of September 30, 2021 and are summarized as follows: Fair Value Measurements at Reporting Date Using Description September 30, 2021 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Cash equivalents: Money market funds $ 44.7 $ 44.7 $ — $ — Commercial paper 0.1 — 0.1 — U.S. treasury obligations 17.5 — 17.5 — Available-for-sale investments: Time deposits and certificates of deposit 23.9 — 23.9 — Bankers' acceptance drafts 2.5 — 2.5 — Commercial paper 86.2 — 86.2 — Corporate obligations 35.3 — 35.3 U.S. treasury obligations 98.3 — 98.3 — Group insurance contracts 6.4 — 6.4 — Derivatives – foreign exchange forward contracts 3.0 — 3.0 — Derivatives – interest rate hedge-non-current 3.7 — 3.7 Funds in investments and other assets: Israeli pension assets 19.3 — 19.3 — Deferred compensation plan assets: Mutual funds and exchange traded funds 1.6 — 1.6 — Total assets $ 342.5 $ 44.7 $ 297.8 $ — Liabilities: Derivatives –foreign exchange forward contracts $ 0.7 $ — $ 0.7 $ — Derivatives – interest rate hedge – non-current 7.5 — 7.5 — Total liabilities $ 8.2 $ — $ 8.2 $ — Reported as follows: Assets: Cash equivalents $ 62.3 $ 62.2 $ 0.1 $ — Short-term investments 246.2 — 246.2 — Other current assets 3.0 — 3.0 — Total current assets $ 311.5 $ 62.2 $ 249.3 $ — Long-term investments $ 6.4 $ — $ 6.4 $ — Other assets 24.6 — 24.6 — Total long-term assets $ 31.0 $ — $ 31.0 $ — Liabilities: Other current liabilities $ 0.7 $ — $ 0.7 $ — Other liabilities $ 7.5 $ — $ 7.5 $ — Assets and liabilities of the Company are measured at fair value on a recurring basis as of December 31, 2020 and are summarized as follows: Fair Value Measurements at Reporting Date Using Description December 31, 2020 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Cash equivalents: Money market funds $ 1.3 $ 1.3 $ — $ — Commercial paper 0.3 — 0.3 — U.S. treasury obligations 62.1 — 62.1 — Available-for-sale investments: Time deposits and certificates of deposit 0.7 — 0.7 — Bankers' acceptance drafts 3.8 — 3.8 — U.S. treasury obligations 223.2 — 223.2 — Group insurance contracts 6.5 — 6.5 — Funds in investments and other assets: Israeli pension assets 18.8 — 18.8 — Deferred compensation plan assets: Mutual funds and exchange traded funds 1.7 — 1.7 — Total assets $ 318.4 $ 1.3 $ 317.1 $ — Liabilities: Derivatives – foreign exchange forward contracts $ 6.5 $ — $ 6.5 $ — Derivatives – interest rate hedge - non-current 14.0 — 14.0 — Total liabilities $ 20.5 $ — $ 20.5 $ — Reported as follows: Assets: Cash equivalents $ 63.7 $ 1.3 $ 62.4 $ — Short-term investments 227.7 — 227.7 — Total current assets $ 291.4 $ 1.3 $ 290.1 $ — Long-term investments $ 6.5 $ — $ 6.5 $ — Other assets 20.5 — 20.5 — Total long-term assets $ 27.0 $ — $ 27.0 $ — Liabilities: Other current liabilities $ 6.5 $ — $ 6.5 $ — Other liabilities $ 14.0 $ — $ 14.0 $ —

Derivatives (Tables)

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Summary of Primary Net Hedging Positions and Corresponding Fair Values	The following tables provide a summary of the primary net hedging positions and corresponding fair values held as of September 30, 2021 and December 31, 2020: September 30, 2021 Currency Hedged (Buy/Sell) Gross Notional Value Fair Value (1) U.S. dollar/Japanese yen $ 51.5 $ 0.9 U.S. dollar/South Korean won 81.2 1.4 U.S. dollar/euro 14.4 0.1 U.S. dollar/U.K. pound sterling 6.9 — U.S. dollar/Taiwan dollar 53.6 (0.1 ) Total $ 207.6 $ 2.3 December 31, 2020 Currency Hedged (Buy/Sell) Gross Notional Value Fair Value (1) U.S. dollar/Japanese yen $ 61.5 $ (1.1 ) U.S. dollar/South Korean won 62.2 (3.1 ) U.S. dollar/euro 13.1 (0.6 ) U.S. dollar/U.K. pound sterling 6.1 (0.3 ) U.S. dollar/Taiwan dollar 33.3 (1.4 ) Total $ 176.2 $ (6.5 ) (1) Represents receivable (payable) amount included in the condensed consolidated balance sheet.
Summary of Various Interest Rate Hedges	The table below summarizes the various interest rate hedges entered into by the Company: September 30, 2021 September 30, 2021 December 31, 2020 Swap Trade Date Effective Date Maturity Fixed Rate Notional Amount at Effective Date Notional Amount Fair Value Asset (Liability) Fair Value Asset (Liability) 1 April 3, 2019 April 5, 2019 March 31, 2023 2.309 % $ 300.0 $ 300.0 (7.5 ) (12.4 ) 2 October 29, 2020 October 26, 2021 February 28, 2025 0.485 % $ 200.0 $ — 2.3 (0.7 ) 3 October 29, 2020 March 31, 2022 February 28, 2025 0.623 % $ 100.0 $ — 1.4 (0.9 ) Total $ (3.8 ) $ (14.0 )
Summary of Fair Value Amounts of Company's Derivative Instruments	The following table provides a summary of the fair value amounts of the Company’s derivative instruments: Derivatives Designated as Hedging Instruments September 30, 2021 December 31, 2020 Derivative assets: Foreign exchange forward contracts (1) $ 3.0 $ — Interest rate hedges (2) 3.7 — Derivative liabilities: Foreign exchange forward contracts (1) (0.7 ) (6.5 ) Interest rate hedge (2) (7.5 ) (14.0 ) Total net derivative liability designated as hedging instruments $ (1.5 ) $ (20.5 ) (1) The derivative asset of $3.0 and derivative liability of $0.7 related to the foreign exchange forward contracts are classified in other current assets and other current liabilities in the condensed consolidated balance sheet as of September 30, 2021. The derivative liability of $6.5 related to the foreign exchange forward contracts is classified in other current liabilities in the condensed consolidated balance sheet as of December 31, 2020. These foreign exchange forward contracts are subject to a master netting agreement with one financial institution. However, the Company has elected to record these contracts on a gross basis in the balance sheet. (2) The interest rate hedge asset of $3.7 is classified in other non-current assets in the condensed consolidated balance sheet as of September 30, 2021. The interest rate hedge liabilities of $7.5 and $14.0 are classified in other non-current liabilities in the condensed consolidated balance sheet as of September 30, 2021 and December 31, 2020, respectively.
Summary of Gain (Losses) on Derivatives Designated as Cash Flow Hedging Instruments	The following table provides a summary of the gains (losses) on derivatives designated as cash flow hedging instruments: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Forward exchange forward contracts: Net (loss) gain recognized in accumulated OCI (1) $ 3.0 $ (0.6 ) $ 13.9 $ (7.7 ) Net (loss) gain reclassified from accumulated OCI into income (2) $ (0.2 ) $ 0.4 $ (2.1 ) $ 2.2 (1) Net change in the fair value of the effective portion classified in accumulated OCI. (2) Effective portion classified in cost of products for the three and nine months ended September 30, 2021 and 2020. The tax effect of the gains or losses reclassified from accumulated OCI into income is immaterial.
Summary of (Loss) Gain on Derivatives Not Designated as Hedging Instruments	The following table provides a summary of the losses on derivatives not designated as hedging instruments: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Foreign exchange forward contracts: Net loss recognized in income (1) $ (2.2 ) $ (0.6 ) $ (9.0 ) $ (0.6 ) (1) The Company enters into foreign exchange forward contracts to hedge against changes in the balance sheet for certain subsidiaries to mitigate the risk associated with certain foreign currency transactions in the ordinary course of business. In conjunction with the acquisition of Photon Control, the Company entered into a foreign currency contract to hedge the Canadian dollar purchase price. These derivatives are not designated as hedging instruments and gains or losses from these derivatives are recorded in other (expense) income in the periods in which they occur.

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2021
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories consist of the following: September 30, 2021 December 31, 2020 Raw materials $ 365.9 $ 321.3 Work-in-process 84.9 76.7 Finished goods 99.6 103.4 $ 550.4 $ 501.4

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Schedule of Elements of Lease Payments	The elements of lease expense were as follows: Three Months Ended September 30, 2021 2020 Lease cost: Operating lease cost (1) $ 6.6 $ 7.2 Short-term lease 1.2 1.4 Total lease cost $ 7.8 $ 8.6 Nine Months Ended September 30, 2021 2020 Lease cost: Operating lease cost (1) $ 20.7 $ 22.1 Short-term lease 3.4 3.7 Total lease cost $ 24.1 $ 25.8 (1) Operating lease cost includes an immaterial amount of variable expenses and sublease rental income.
Future Lease Payment Under Non-Cancelable Lease	Future lease payments under non-cancelable leases as of September 30, 2021 are detailed as follows: 2021 (remaining) $ 4.8 2022 24.1 2023 21.0 2024 19.5 2025 18.1 Thereafter 172.3 Total lease payments 259.8 Less: imputed interest 49.5 Total operating lease liabilities $ 210.3

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	The changes in the carrying amount of goodwill and accumulated impairment loss during the nine months ended September 30, 2021 and year ended December 31, 2020 were as follows: Nine Months Ended September 30, 2021 Twelve Months Ended December 31, 2020 Gross Carrying Amount Accumulated Impairment Loss Net Gross Carrying Amount Accumulated Impairment Loss Net Beginning balance at January 1 $ 1,211.8 $ (145.4 ) $ 1,066.4 $ 1,202.8 $ (144.3 ) $ 1,058.5 Acquired goodwill (1) 168.2 — 168.2 — — — Impairment of goodwill (2) — — — — (1.1 ) (1.1 ) Foreign currency translation (8.4 ) — (8.4 ) 9.0 — 9.0 Ending balance at September 30, 2021 and December 31, 2020 $ 1,371.6 $ (145.4 ) $ 1,226.2 $ 1,211.8 $ (145.4 ) $ 1,066.4 (1) During the nine months ended September 30, 2021, the Company recorded goodwill related to the acquisition of Photon Control. (2) During the twelve months ended December 31, 2020, the Company recorded $1.1 of goodwill impairment charges related to the pending closure of a facility in Europe.
Intangible Assets	Intangible Assets Components of the Company’s intangible assets are comprised of the following: As of September 30, 2021: Gross Accumulated Impairment Charges Accumulated Amortization Foreign Currency Translation Net Completed technology (1) $ 556.4 $ (0.1 ) $ (232.2 ) $ (2.4 ) $ 321.7 Customer relationships (1) 317.6 (1.4 ) (119.6 ) 0.1 196.7 Patents, trademarks, trade names and other (1) 122.5 — (51.5 ) 0.1 71.1 $ 996.5 $ (1.5 ) $ (403.3 ) $ (2.2 ) $ 589.5 (1) During the three months ended September 30, 2021, the Company recorded $121.0 of separately identified intangible assets related to the acquisition of Photon Control, of which $110.0 was completed technology, $9.4 was customer relationships and $1.6 was patents, trademarks, trade names and other. As of December 31, 2020: Gross Accumulated Impairment Charges Accumulated Amortization Foreign Currency Translation Net Completed technology $ 446.4 $ (0.1 ) $ (209.8 ) $ (0.1 ) $ 236.4 Customer relationships 308.2 (1.4 ) (104.8 ) 1.7 203.7 Patents, trademarks, trade names and other 120.9 — (48.6 ) (0.2 ) 72.1 $ 875.5 $ (1.5 ) $ (363.2 ) $ 1.4 $ 512.2
Estimated Net Amortization Expense	Aggregate net amortization expense related to acquired intangible assets for future years is as follows: Year Amount 2021 (remaining) $ 15.2 2022 59.7 2023 58.2 2024 57.3 2025 56.4 2026 52.8 Thereafter 234.0

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Schedule of Short-Term Debt	The Company’s outstanding debt is as follows: September 30, 2021 December 31, 2020 Short-term debt: Term Loan Facility $ 9.0 $ 9.0 Japanese lines of credit and financing facility — 5.5 $ 9.0 $ 14.5
Schedule of Long-Term Debt	September 30, 2021 December 31, 2020 Long-term debt: Term Loan Facility, net (1) $ 809.7 $ 815.0 (1) Net of deferred financing fees, original issuance discount and repricing fees in the aggregate of $8.0 and $9.4 as of September 30, 2021 and December 31, 2020, respectively.
Schedule of Contractual Maturities of Debt Obligations	Contractual maturities of the Company’s debt obligations as of September 30, 2021 are as follows: Year Amount 2021 (remaining) $ 2.2 2022 9.0 2023 9.0 2024 9.0 2025 9.0 2026 788.5

Product Warranties (Tables)

Product Warranties (Tables)	9 Months Ended
	Sep. 30, 2021
Guarantees And Product Warranties [Abstract]
Product Warranty Activities	Product warranty activities were as follows: Nine Months Ended September 30, 2021 2020 Beginning of period $ 18.4 $ 14.9 Provision for product warranties 30.4 20.2 Charges to warranty liability (26.0 ) (19.0 ) End of period (1) $ 22.8 $ 16.1 (1) As of September 30, 2021, short-term product warranties of $21.7 and long-term product warranties of $1.1 were included within other current liabilities and other non-current liabilities, respectively, within the accompanying condensed consolidated balance sheet. As of September 30, 2020, short-term product warranties of $13.0 and long-term product warranties of $3.1 were included within other current liabilities and other non-current liabilities, respectively, within the accompanying condensed consolidated balance sheet.

Net Income Per Share (Tables)

Net Income Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Income Per Share	The following table sets forth the computation of basic and diluted net income per share: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Numerator: Net income $ 132.4 $ 91.7 $ 401.2 $ 234.5 Denominator: Shares used in net income per common share – basic 55.5 55.2 55.4 55.1 Effect of dilutive securities: Restricted stock units and stock appreciation rights 0.2 0.2 0.3 0.2 Shares used in net income per common share – diluted 55.7 55.4 55.7 55.3 Net income per common share: Basic $ 2.39 $ 1.66 $ 7.24 $ 4.26 Diluted $ 2.38 $ 1.66 $ 7.21 $ 4.24

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Schedule of Total Stock-Based Compensation Expense Included in Company's Condensed Consolidated Statements of Operations and Comprehensive Income	The total stock-based compensation expense included in the Company’s condensed consolidated statements of operations and comprehensive income was as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Cost of revenues $ 0.9 $ 1.2 $ 2.8 $ 3.1 Research and development 1.1 1.0 3.3 3.0 Selling, general and administrative 6.9 5.1 21.7 15.9 Acquisition and integration costs — 0.1 — 0.7 Total pre-tax stock-based compensation expense $ 8.9 $ 7.4 $ 27.8 $ 22.7
Summary of Activity for RSUs	The following table presents the activity for RSUs under the 2014 Plan: Nine Months Ended September 30, 2021 Outstanding RSUs Weighted Average Grant Date Fair Value RSUs – beginning of period 0.6 $ 93.26 Granted 0.2 $ 177.91 Vested (0.3 ) $ 95.47 RSUs – end of period 0.5 $ 127.31

Acquisition (Tables)

Acquisition (Tables)	9 Months Ended
	Sep. 30, 2021
Business Combinations [Abstract]
Summary of Purchase Price	The purchase price of Photon Control consisted of the following: Cash paid for outstanding shares (1) $ 302.7 Less: Cash and cash equivalents acquired (34.3 ) Total purchase price, net of cash and cash equivalents acquired $ 268.4 (1) Represents cash paid of CAD 3.60 per share for approximately 105.2 shares of Photon Control common stock, without interest and subject to deduction for any required withholding tax.
Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed	The following table summarizes the preliminary allocation of the purchase price to the fair values assigned to assets acquired and liabilities assumed at the date of the Photon Control Acquisition: Current assets $ 51.4 Intangible assets 121.0 Goodwill 168.2 Other non-current assets 8.6 Total assets acquired 349.2 Current liabilities 13.7 Non-current deferred taxes 32.1 Other long-term liabilities 0.7 Total liabilities assumed 46.5 Fair value of assets acquired and liabilities assumed 302.7 Less: Cash and cash equivalents acquired (34.3 ) Total purchase price, net of cash and cash equivalents acquired $ 268.4
Allocation of Acquired Intangible Assets and Related Estimates of Useful Lives	The following table reflects the allocation of the acquired intangible assets and related estimate of useful lives: Completed technology $ 110.0 9 years Customer relationships $ 9.4 10 years Trade names 0.2 0.5 years Backlog 1.4 1.5 years $ 121.0

Business Segment, Geographic _2

Business Segment, Geographic Area, and Significant Customer Information (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Net Revenues, Assets and Goodwill by Reportable Segment	The following table sets forth net revenues by reportable segment: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Vacuum & Analysis $ 483.1 $ 361.3 $ 1,376.6 $ 995.1 Light & Motion 208.7 175.9 583.6 507.3 Equipment & Solutions 50.1 52.6 225.5 167.4 $ 741.9 $ 589.8 $ 2,185.7 $ 1,669.8 The following table sets forth segment assets by reportable segment: September 30, 2021 Vacuum & Analysis Light & Motion Equipment & Corporate, Eliminations & Other Total Segment assets: Accounts receivable $ 292.2 $ 139.1 $ 36.7 $ (24.6 ) $ 443.4 Inventories 317.9 170.9 64.1 (2.5 ) 550.4 Total segment assets $ 610.1 $ 310.0 $ 100.8 $ (27.1 ) $ 993.8 December 31, 2020 Vacuum & Analysis Light & Motion Equipment & Corporate, Eliminations & Other Total Segment assets: Accounts receivable $ 229.1 $ 122.6 $ 51.7 $ (10.7 ) $ 392.7 Inventories 273.3 166.1 63.7 (1.7 ) 501.4 Total segment assets $ 502.4 $ 288.7 $ 115.4 $ (12.4 ) $ 894.1 Goodwill associated with each of the Company’s reportable segments is as follows: September 30, 2021 December 31, 2020 Reportable segment: Vacuum & Analysis $ 195.2 $ 196.2 Light & Motion 556.3 395.3 Equipment & Solutions 474.7 474.9 Total goodwill $ 1,226.2 $ 1,066.4
Reconciliation of Segment Gross Profit to Consolidated Net Income	The following table sets forth a reconciliation of segment gross profit to consolidated net income: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Gross profit by reportable segment: Vacuum & Analysis $ 226.3 $ 163.5 $ 643.8 $ 444.1 Light & Motion 100.6 76.0 272.6 227.8 Equipment & Solutions 21.5 22.5 109.3 76.0 Total gross profit by reportable segment 348.4 262.0 1,025.7 747.9 Operating expenses: Research and development 51.7 42.5 148.9 127.7 Selling, general and administrative 95.8 87.0 288.9 260.3 Acquisition and integration costs 8.6 0.5 20.8 3.4 Restructuring and other 2.0 3.1 9.9 6.8 Amortization of intangible assets 15.0 12.5 40.1 42.6 Asset impairment — — — 1.2 COVID-19 related net credits — — — (1.2 ) Income from operations 175.3 116.4 517.1 307.1 Interest income 0.1 0.1 0.4 1.1 Interest expense 6.3 6.6 19.1 22.7 Other expense, net 2.9 1.1 11.5 3.0 Income before income taxes 166.2 108.8 486.9 282.5 Provision for income taxes 33.8 17.1 85.7 48.0 Net income $ 132.4 $ 91.7 $ 401.2 $ 234.5
Schedule of Capital Expenditures, Depreciation and Amortization Expense of Intangible Assets by Reportable Segment	The following table sets forth capital expenditures by reportable segment for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Vacuum & Analysis $ 10.8 $ 9.7 $ 27.2 $ 28.8 Light & Motion 8.3 12.9 25.0 21.4 Equipment & Solutions 1.4 6.4 11.1 9.7 Total capital expenditures $ 20.5 $ 29.0 $ 63.3 $ 59.9 The following table sets forth depreciation and amortization by reportable segment for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Vacuum & Analysis $ 5.1 $ 5.1 $ 17.3 $ 15.1 Light & Motion 13.5 9.6 32.3 33.5 Equipment & Solutions 8.8 8.6 26.5 27.2 Total depreciation and amortization $ 27.4 $ 23.3 $ 76.1 $ 75.8
Reconciliation of Segment Assets to Consolidated Total Assets	The following is a reconciliation of segment assets to consolidated total assets: September 30, 2021 December 31, 2020 Total segment assets $ 993.8 $ 894.1 Cash and cash equivalents and short-term investments 879.6 836.0 Other current assets 121.5 74.3 Property, plant and equipment, net 316.8 284.3 Right-of-use assets 184.5 184.4 Goodwill and intangible assets, net 1,815.7 1,578.6 Other assets and long-term investments 54.0 52.1 Consolidated total assets $ 4,365.9 $ 3,903.8
Schedule of Net Revenues and Long-Lived Assets by Geographic Regions	Intercompany sales between geographic areas are at tax transfer prices and have been eliminated from consolidated net revenues. Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Net revenues: United States $ 348.4 $ 281.2 $ 922.7 $ 757.7 South Korea 90.6 65.8 292.6 206.8 China 80.4 67.6 263.5 192.5 Taiwan 44.1 27.8 164.8 73.3 Japan 46.9 39.9 141.2 117.1 Other Asia 74.0 59.4 228.4 175.3 Europe 57.5 48.1 172.5 147.1 $ 741.9 $ 589.8 $ 2,185.7 $ 1,669.8 Long-lived assets: (1) September 30, 2021 December 31, 2020 North America $ 402.4 $ 364.0 Europe 34.5 45.1 Asia 102.1 94.8 $ 539.0 $ 503.9 (1) Long-lived assets include property, plant and equipment, net, right-of-use assets, and certain other assets, and exclude goodwill, intangible assets and long-term tax-related accounts.
Summary of Net Revenues by Major Customers	The following customers represented greater than 10% of the Company’s net revenues as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Lam Research Corporation 18.4 % 14.1 % 14.6 % 12.3 % Applied Materials, Inc. 10.6 % 11.0 % 10.7 % 10.8 %

Restructuring and Other (Tables

Restructuring and Other (Tables)	9 Months Ended
	Sep. 30, 2021
Expense Of Restructuring Activities And Other [Abstract]
Schedule of Company's Restructuring Activity	Restructuring activities were as follows: Nine Months Ended September 30, 2021 2020 Beginning of period $ 0.3 $ 3.7 Charged to expense 5.9 2.0 Payments and adjustments (5.8 ) (4.4 ) End of period $ 0.4 $ 1.3

Recently Issued or Adopted Ac_3

Recently Issued or Adopted Accounting Pronouncements - Additional Information (Detail) - Accounting Standards Update 2019-12 [Member]	Sep. 30, 2021
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, immaterial effect	true

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Accounting Standards Codification Topic 606 adjustment [Member]
Change in Contract with Customer, Liability [Line Items]
Contract assets	$ 3.8	$ 3.7

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Schedule of Deferred Revenue and Customer Advances by Arrangement (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Change In Contract With Customer Liability [Abstract]
Beginning balance, January 1	$ 36.7	$ 24.8
Additions to deferred revenue and customer advances	68.1	76.3
Amount of deferred revenue and customer advances recognized in income	(63.7)	(65.6)
Ending balance, September 30	$ 41.1	$ 35.5

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Schedule of Deferred Revenue and Customer Advances by Arrangement (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Jan. 01, 2021	Dec. 31, 2020
Change in Contract with Customer, Liability [Line Items]
Long-term deferred revenue	$ 3.5	$ 5.5
Deferred revenue and customer advances	37.6		$ 31.2
Deferred Revenue [Member]
Change in Contract with Customer, Liability [Line Items]
Deferred revenue and customer advances	20	18.4
Customer Advances [Member]
Change in Contract with Customer, Liability [Line Items]
Deferred revenue and customer advances	$ 17.6	$ 12.8

Revenue from Contracts with C_6

Revenue from Contracts with Customers - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Net revenues	$ 741.9	$ 589.8	$ 2,185.7	$ 1,669.8
Products [Member]
Disaggregation of Revenue [Line Items]
Net revenues	649.1	506.8	1,910.8	1,441
Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	92.8	83	274.9	228.8
Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	483.1	361.3	1,376.6	995.1
Vacuum & Analysis [Member] | Products [Member]
Disaggregation of Revenue [Line Items]
Net revenues	425.7	313.9	1,203.7	863.5
Vacuum & Analysis [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	57.4	47.4	172.9	131.6
Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	208.7	175.9	583.6	507.3
Light & Motion [Member] | Products [Member]
Disaggregation of Revenue [Line Items]
Net revenues	190.8	156.9	531.5	457.3
Light & Motion [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	17.9	19	52.1	50
Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	50.1	52.6	225.5	167.4
Equipment & Solutions [Member] | Products [Member]
Disaggregation of Revenue [Line Items]
Net revenues	32.6	36	175.6	120.2
Equipment & Solutions [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	$ 17.5	$ 16.6	$ 49.9	$ 47.2

Investments - Gross Unrealized

Investments - Gross Unrealized Gains and (Losses) Aggregated by Investment Category (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	$ 246.3	$ 227.7
Investments, Estimated Fair Value	246.3	227.7
Time Deposits and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	24	0.7
Investments, Estimated Fair Value	24	0.7
Bankers' Acceptance Drafts [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	2.5	3.8
Investments, Estimated Fair Value	2.5	3.8
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	86.2
Investments, Estimated Fair Value	86.2
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	35.3
Investments, Estimated Fair Value	35.3
U.S. Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	98.3	223.2
Investments, Estimated Fair Value	98.3	223.2
Group Insurance Contracts [Member] | Long Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	5.5	5.6
Investments, Gross Unrealized Gains	0.9	0.9
Investments, Estimated Fair Value	$ 6.4	$ 6.5

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	$ 246.3	$ 227.7
Short-term investments	246.3	227.7
Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	86.2
Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	35.3
Other Current Liabilities [Member] | Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives liabilities foreign exchange forward contracts	0.7	6.5
Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	62.3	63.7
Total assets	342.5	318.4
Total liabilities	8.2	20.5
Short-term investments	246.2	227.7
Other current assets	3
Total current assets	311.5	291.4
Long-term investments	6.4	6.5
Other assets	24.6	20.5
Total long-term assets	31	27
Fair Value Measurements, Recurring [Member] | Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives assets foreign exchange forward contracts	3
Derivatives liabilities foreign exchange forward contracts	0.7	6.5
Fair Value Measurements, Recurring [Member] | Interest Rate Hedge [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives assets interest rate hedge-non-current	3.7
Derivatives liabilities interest rate hedge - non-current	7.5	14
Fair Value Measurements, Recurring [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0.1	0.3
Available-for-sale investments	86.2
Fair Value Measurements, Recurring [Member] | Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	35.3
Fair Value Measurements, Recurring [Member] | Group Insurance Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	6.4	6.5
Fair Value Measurements, Recurring [Member] | Israeli Pension Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pension assets	19.3	18.8
Fair Value Measurements, Recurring [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	44.7	1.3
Fair Value Measurements, Recurring [Member] | U.S. Treasury Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	17.5	62.1
Available-for-sale investments	98.3	223.2
Fair Value Measurements, Recurring [Member] | Time Deposits and Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	23.9	0.7
Fair Value Measurements, Recurring [Member] | Bankers' Acceptance Drafts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	2.5	3.8
Fair Value Measurements, Recurring [Member] | Mutual Funds and Exchange Traded Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan assets	1.6	1.7
Fair Value Measurements, Recurring [Member] | Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities	0.7	6.5
Fair Value Measurements, Recurring [Member] | Other Noncurrent Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities	7.5	14
Fair Value Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	62.2	1.3
Total assets	44.7	1.3
Total current assets	62.2	1.3
Fair Value Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	44.7	1.3
Fair Value Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0.1	62.4
Total assets	297.8	317.1
Total liabilities	8.2	20.5
Short-term investments	246.2	227.7
Other current assets	3
Total current assets	249.3	290.1
Long-term investments	6.4	6.5
Other assets	24.6	20.5
Total long-term assets	31	27
Fair Value Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives assets foreign exchange forward contracts	3
Derivatives liabilities foreign exchange forward contracts	0.7	6.5
Fair Value Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Hedge [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives assets interest rate hedge-non-current	3.7
Derivatives liabilities interest rate hedge - non-current	7.5	14
Fair Value Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0.1	0.3
Available-for-sale investments	86.2
Fair Value Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	35.3
Fair Value Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Group Insurance Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	6.4	6.5
Fair Value Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Israeli Pension Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pension assets	19.3	18.8
Fair Value Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	17.5	62.1
Available-for-sale investments	98.3	223.2
Fair Value Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Time Deposits and Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	23.9	0.7
Fair Value Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Bankers' Acceptance Drafts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	2.5	3.8
Fair Value Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mutual Funds and Exchange Traded Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan assets	1.6	1.7
Fair Value Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities	0.7	6.5
Fair Value Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Noncurrent Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities	$ 7.5	$ 14

Derivatives - Additional Inform

Derivatives - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Maximum period for hedging a portion of forecasted foreign currency denominated intercompany sales of inventory		18 months
Accumulated other comprehensive income realization period		12 months
Foreign Exchange Forward Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross notional values of outstanding forward foreign exchange contracts	$ 207.6	$ 207.6	$ 176.2
Other Expense, Net [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value loss	$ 2.8	$ 10.3

Derivatives - Summary of Primar

Derivatives - Summary of Primary Net Hedging Positions and Corresponding Fair Values (Detail) - Foreign Exchange Forward Contracts [Member] - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	$ 207.6	$ 176.2
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	2.3	(6.5)
U.S. Dollar/Japanese Yen [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	51.5	61.5
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	0.9	(1.1)
U.S. Dollar/South Korean Won [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	81.2	62.2
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	1.4	(3.1)
U.S. Dollar/Euro [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	14.4	13.1
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	0.1	(0.6)
U.S. Dollar/U.K. Pound Sterling [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	6.9	6.1
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net		(0.3)
U.S. Dollar/Taiwan Dollar [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	53.6	33.3
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	$ (0.1)	$ (1.4)

Derivatives - Summary of Variou

Derivatives - Summary of Various Interest Rate Hedges (Detail) - Incremental Term Loan Facility [Member] - Interest Rate Hedge [Member] - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Fair Value Asset (Liability)	$ (3.8)	$ (14)
Swap Agreement One [Member]
Derivative [Line Items]
Trade Date	Apr. 3, 2019
Effective Date	Apr. 5, 2019
Maturity	Mar. 31, 2023
Fixed Rate	2.309%
Notional Amount at Effective Date	$ 300
Fair Value Asset (Liability)	$ (7.5)	(12.4)
Swap Agreement Two [Member]
Derivative [Line Items]
Trade Date	Oct. 29, 2020
Effective Date	Oct. 26, 2021
Maturity	Feb. 28, 2025
Fixed Rate	0.485%
Notional Amount at Effective Date	$ 200
Fair Value Asset (Liability)	$ 2.3	(0.7)
Swap Agreement Three [Member]
Derivative [Line Items]
Trade Date	Oct. 29, 2020
Effective Date	Mar. 31, 2022
Maturity	Feb. 28, 2025
Fixed Rate	0.623%
Notional Amount at Effective Date	$ 100
Fair Value Asset (Liability)	$ 1.4	$ (0.9)

Derivatives - Summary of Fair V

Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total net derivative liability designated as hedging instruments	$ (1.5)	$ (20.5)
Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Total net derivative liability designated as hedging instruments	2.3	(6.5)
Foreign Exchange Forward Contracts [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	3
Derivative liabilities	(0.7)	(6.5)
Interest Rate Hedge [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	3.7
Derivative liabilities	$ (7.5)	$ (14)

Derivatives - Summary of Fair_2

Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Other Current Assets [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Forward foreign exchange contract derivative assets	$ 3
Other Current Liabilities [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Forward foreign exchange contract derivative liabilities	0.7	$ 6.5
Other Non-current Assets [Member] | Interest Rate Hedge [Member]
Derivatives, Fair Value [Line Items]
Interest rate hedge derivative assets	3.7
Other Noncurrent Liabilities [Member] | Interest Rate Hedge [Member]
Derivatives, Fair Value [Line Items]
Interest rate hedge liabilities	$ 7.5	$ 14

Derivatives - Summary of Gain (

Derivatives - Summary of Gain (Losses) on Derivatives Designated as Cash Flow Hedging Instruments (Detail) - Cash Flow Hedging [Member] - Foreign Exchange Forward Contracts [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Net (loss) gain recognized in accumulated OCI	$ 3	$ (0.6)	$ 13.9	$ (7.7)
Net (loss) gain reclassified from accumulated OCI into income	$ (0.2)	$ 0.4	$ (2.1)	$ 2.2

Derivatives - Summary of (Loss)

Derivatives - Summary of (Loss) Gain on Derivatives Not Designated as Hedging Instruments (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Foreign Exchange Contracts [Member]
Derivative Instruments Gain Loss Not Designated As Hedging Instruments [Line Items]
Net loss recognized in income	$ (2.2)	$ (0.6)	$ (9)	$ (0.6)

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 365.9	$ 321.3
Work-in-process	84.9	76.7
Finished goods	99.6	103.4
Inventories	$ 550.4	$ 501.4

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Leases [Line Items]
Lessee, operating leases, option to extend	Leases with renewal options allow the Company to extend the lease term typically between 1 to 10 years
Lessee, operating lease, existence of option to extend [true false]	true
Lessee, operating lease, option to terminate	real estate lease agreements include Company options to either extend and/or terminate the lease
Lessee, operating lease, existence of option to terminate [true false]	true
Weighted average discount rate	2.90%	3.00%
Weighted average remaining lease term	14 years 4 months 24 days	15 years
Operating cash flows used for operating leases	$ 11.6	$ 15.4
Tenant Improvements allowance receipts	5
Remaining 2021 lease payment	4.8
Tenant improvement allowance for 2021	$ 1.3
Minimum [Member]
Leases [Line Items]
Operating leases, options to extend leases term	1 year
Maximum [Member]
Leases [Line Items]
Operating leases, options to extend leases term	10 years

Leases - Lease expense (Detail)

Leases - Lease expense (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lease cost:
Operating lease cost	[1]	$ 6.6	$ 7.2	$ 20.7	$ 22.1
Short-term lease		1.2	1.4	3.4	3.7
Total lease cost		$ 7.8	$ 8.6	$ 24.1	$ 25.8
[1]	Operating lease cost includes an immaterial amount of variable expenses and sublease rental income.

Leases - Schedule of Future Lea

Leases - Schedule of Future Lease Payments (Detail) $ in Millions	Sep. 30, 2021USD ($)
Leases [Abstract]
2021 (remaining)	$ 4.8
2022	24.1
2023	21
2024	19.5
2025	18.1
Thereafter	172.3
Total lease payments	259.8
Less: imputed interest	49.5
Total operating lease liabilities	$ 210.3

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Goodwill (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance, Goodwill Gross Carrying Amount	$ 1,211.8	$ 1,202.8
Acquired goodwill, Gross Carrying Amount	168.2
Foreign currency translation, Gross Carrying Amount	(8.4)	9
Ending balance, Goodwill Gross Carrying Amount	1,371.6	1,211.8
Beginning balance, Accumulated Impairment Loss	(145.4)	(144.3)
Impairment of goodwill, Accumulated Impairment Loss		(1.1)
Ending balance, Accumulated Impairment Loss	(145.4)	(145.4)
Beginning balance, Goodwill Net	1,066.4	1,058.5
Acquired goodwill, Net	168.2
Foreign currency translation, Net	(8.4)	9
Ending balance, Goodwill Net	$ 1,226.2	$ 1,066.4

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Goodwill (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill impairment charges related to pending closure of facility in Europe	$ 1.1

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 996.5	$ 875.5
Accumulated Impairment Charges	(1.5)	(1.5)
Accumulated Amortization	(403.3)	(363.2)
Foreign Currency Translation	(2.2)	1.4
Intangible assets, net	589.5	512.2
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	556.4	446.4
Accumulated Impairment Charges	(0.1)	(0.1)
Accumulated Amortization	(232.2)	(209.8)
Foreign Currency Translation	(2.4)	(0.1)
Intangible assets, net	321.7	236.4
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	317.6	308.2
Accumulated Impairment Charges	(1.4)	(1.4)
Accumulated Amortization	(119.6)	(104.8)
Foreign Currency Translation	0.1	1.7
Intangible assets, net	196.7	203.7
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	122.5	120.9
Accumulated Amortization	(51.5)	(48.6)
Foreign Currency Translation	0.1	(0.2)
Intangible assets, net	$ 71.1	$ 72.1

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 589.5	$ 512.2
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	321.7	236.4
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	196.7	203.7
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	71.1	$ 72.1
Photon Control Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	121
Photon Control Inc [Member] | Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	110
Photon Control Inc [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	9.4
Photon Control Inc [Member] | Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 1.6

Goodwill and Intangible Asset_6

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Goodwill And Intangible Assets [Line Items]
Amortization of intangible assets	$ 15	$ 12.5	$ 40.1	$ 42.6
Trademarks and trade names [member]
Goodwill And Intangible Assets [Line Items]
Un-amortized Intangible assets, net	$ 55.9		$ 55.9

Goodwill and Intangible Asset_7

Goodwill and Intangible Assets - Estimated Net Amortization Expense (Detail) $ in Millions	Sep. 30, 2021USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
2021 (remaining)	$ 15.2
2022	59.7
2023	58.2
2024	57.3
2025	56.4
2026	52.8
Thereafter	$ 234

Debt - Schedule of Short-Term D

Debt - Schedule of Short-Term Debt (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Short Term Debt [Line Items]
Short term debt	$ 9	$ 14.5
Term Loan Facility [Member]
Short Term Debt [Line Items]
Short term debt	$ 9	9
Japan [Member] | Lines of Credit and Financing Facility [Member]
Short Term Debt [Line Items]
Short term debt		$ 5.5

Debt - Schedule of Long-Term De

Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long term debt	$ 809.7	$ 815
Term Loan Facility, Net [Member]
Debt Instrument [Line Items]
Long term debt	$ 809.7	$ 815

Debt - Schedule of Long-Term _2

Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Term Loan Facility, Net [Member]
Debt Instrument [Line Items]
Deferred financing fees, original issuance discount and repricing fees	$ 8	$ 9.4

Debt - Additional Information (

Debt - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Disclosure [Abstract]
Interest expense	$ 6.3	$ 6.6	$ 19.1	$ 22.7

Debt - Senior Secured Term Loan

Debt - Senior Secured Term Loan Credit Facility - Additional Information (Detail) - Newport Corporation [Member]	9 Months Ended
	Sep. 30, 2021USD ($)
Term Loan Credit Agreement
Debt Instrument [Line Items]
Deferred finance fees, original issue discount and re-pricing fee, gross	$ 8,000,000
Term Loan Credit Agreement | Secured Debt [Member]
Debt Instrument [Line Items]
Secured term loan, face amount	$ 780,000,000
Term loan maturity date	Feb. 2, 2026
Debt instrument, interest rate terms	borrowings under the Term Loan Facility​​​​​​​ bear interest per annum at one of the following rates selected by the Company: (a) a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50%, (2) the “prime rate” quoted in The Wall Street Journal, (3) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs, plus 1.00%, and (4) a floor of 1.00%, plus, in each case, an applicable margin of 0.75%; or (b) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, subject to a LIBOR rate floor of 0.0%, plus an applicable margin of 1.75%. The Company has elected the interest rate as described in clause (b) of the foregoing sentence. The Term Loan Credit Agreement provides that, unless an alternate rate of interest is agreed, all loans will be determined by reference to the base rate if the LIBOR rate cannot be ascertained, if regulators impose material restrictions on the authority of a lender to make LIBOR rate loans, or for other reasons.
Debt instrument, interest rate	0.00%
Deferred finance fees, original issue discount and re-pricing fee, gross	$ 42,600,000
Debt instrument, frequency of periodic payment	quarterly
Debt instrument, periodic payment percentage	0.25%
Term Loan Credit Agreement | Secured Debt [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	0.75%
Term Loan Credit Agreement | Secured Debt [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	0.50%
Term Loan Credit Agreement | Secured Debt [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	1.75%
Term Loan Credit Agreement | Secured Debt [Member] | Adjusted One Month LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	1.00%
Term Loan Credit Agreement | Secured Debt [Member] | Floor Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	1.00%
May Term Loan Amendment [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Line of credit facility minimum additional borrowing capacity	$ 600,000,000
Minimum percentage of consolidated EBITDA	100.00%
Leverage ratio	3.25
Term Loan Facility [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured term loan, face amount	$ 826,700,000
Debt instrument, interest rate	1.80%

Debt - Senior Secured Asset-Bas

Debt - Senior Secured Asset-Based Revolving Credit Facility - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2021USD ($)
Debt Instrument [Line Items]
Percentage of commitment amount available	10.00%
Availability under credit facility	$ 8,500,000
Number of consecutive business days for borrowing base	30 days
Asset Based Credit Agreement [Member]
Debt Instrument [Line Items]
Percentage of commitment amount available	10.00%
Availability under credit facility	$ 8,500,000
Number of consecutive business days for borrowing base	3 days
Electro Scientific Industries Inc | Asset Based Credit Agreement [Member] | Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Secured term loan, face amount	$ 100,000,000
Electro Scientific Industries Inc | Asset Based Credit Agreement [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Percentage of borrowing based on eligible accounts	85.00%
Percentage of borrowing based on lower of net book value of eligible inventory	20.00%
Percentage of borrowing base	30.00%
Percentage of borrowing based on lower of cost or market value of certain eligible inventory	65.00%
Percentage of borrowing based on net orderly liquidation value of certain eligible inventory	85.00%
Electro Scientific Industries Inc | Asset Based Credit Agreement [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Borrowing capacity in the form of letters of credit	$ 25,000,000
Newport Corporation [Member] | Asset Based Credit Agreement [Member] | Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Clause to accelerate the scheduled maturities	Under the ABL Facility, the Company is required to prepay amounts outstanding under the ABL Facility (1) if amounts outstanding under the ABL Facility exceed the lesser of (a) the commitment amount and (b) the borrowing base, in an amount required to reduce such shortfall, (2) if amounts outstanding under the ABL Facility in any currency other than U.S. dollars exceed the sublimit for such currency, in an amount required to reduce such shortfall, and (3) during any period in which the Company has excess availability less than the greater of (a) 10.0% of the lesser of (x) the commitment amount and (y) the borrowing base (the “Line Cap”) and (b) $8.5 for 3 consecutive business days, until the time when the Company has excess availability equal to or greater than the greater of (A) 10.0% of the Line Cap and (B) $8.5 for 30 consecutive days, or during the continuance of an event of default, with immediately available funds in its blocked accounts.
Newport Corporation [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	0.50%
Debt instrument, interest rate terms	As of September 30, 2021, borrowings under the ABL Facility bear interest at a rate per annum equal to, at the Company’s option, any of the following, plus, in each case, an applicable margin: (a) a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50%, (2) the “prime rate” quoted in The Wall Street Journal, (3) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs, plus 1.00% and (4) a floor of 0.00%, plus, in each case, an applicable margin ranging from 0.25% to 0.50%; and (b) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, with a floor of 0.00%, plus, in each case, an applicable margin ranging from 1.25% to 1.50%.  The applicable margin for borrowings thereunder is subject to upward or downward adjustment each fiscal quarter, based on the average historical excess availability during the preceding quarter.
Initial commitment fee percentage	0.25%
Number of consecutive business days for borrowing base	30 days
Minimum term loan with earlier maturity than ABL facility subject to spring maturity	$ 100,000,000
Debt instrument, collateral	All obligations under the ABL Facility are guaranteed by certain of the Company’s domestic subsidiaries and are secured by substantially all of the Company’s assets and the assets of such subsidiaries, subject to certain exceptions and exclusions.
Clause to maintain a Fixed Charge Coverage Ratio	From the time when the Company has excess availability less than the greater of (a) 10.0% of the Line Cap and (b) $8.5 until the time when the Company has excess availability equal to or greater than the greater of (a) 10.0% of the Line Cap and (b) $8.5 for 30 consecutive days, or during the continuance of an event of default, the ABL Credit Agreement requires the Company to maintain a fixed charge coverage ratio, tested on the last day of each fiscal quarter, of at least 1.0 to 1.0.
Newport Corporation [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | Minimum [Member]
Debt Instrument [Line Items]
Percentage of line of credit facility excess availability commitment fee	10.00%
Line of credit facility excess availability amount	$ 8,500,000
Fixed charge coverage ratio	1
Newport Corporation [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | Maximum [Member]
Debt Instrument [Line Items]
Percentage of line of credit facility excess availability commitment fee	10.00%
Line of credit facility excess availability amount	$ 8,500,000
Newport Corporation [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | Adjusted One Month LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	1.00%
Newport Corporation [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | Floor Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	0.00%
Newport Corporation [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | Base Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	0.25%
Newport Corporation [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | Base Rate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	0.50%
Newport Corporation [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	1.25%
Newport Corporation [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	1.50%

Debt - Lines of Credit and Borr

Debt - Lines of Credit and Borrowing Arrangements - Additional Information (Detail) - Revolving Lines of Credit [Member] - Japan [Member] - USD ($)	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Aggregate borrowings expire and renewal period	3 months
Borrowing capacity in the form of letters of credit	$ 29,900,000
Total borrowings outstanding	$ 0	$ 5,500,000

Debt - Schedule of Contractual

Debt - Schedule of Contractual Maturities of Debt Obligations (Detail) $ in Millions	Sep. 30, 2021USD ($)
Maturities Of Long Term Debt [Abstract]
2021 (remaining)	$ 2.2
2022	9
2023	9
2024	9
2025	9
2026	$ 788.5

Product Warranties - Product Wa

Product Warranties - Product Warranty Activities (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Guarantees [Abstract]
Beginning of period	$ 18.4	$ 14.9
Provision for product warranties	30.4	20.2
Charges to warranty liability	(26)	(19)
End of period	$ 22.8	$ 16.1

Product Warranties - Product _2

Product Warranties - Product Warranty Activities (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
Other Current Liabilities [Member]
Product Warranty Liability [Line Items]
Short-term product warranties	$ 21.7	$ 13
Other Noncurrent Liabilities [Member]
Product Warranty Liability [Line Items]
Long-term product warranties	$ 1.1	$ 3.1

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Effective tax rate	20.40%	15.70%	17.60%	17.00%
Amount of gross unrecognized tax benefits excluding interest and penalties	$ 47.3		$ 47.3		$ 47
Accrued interest on unrecognized tax benefits	$ 0.9		0.9		$ 0.7
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions			$ 3.8

Net Income Per Share - Computat

Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net income	$ 132.4	$ 146.5	$ 122.3	$ 91.7	$ 73.7	$ 69.1	$ 401.2	$ 234.5
Denominator:
Shares used in net income per common share – basic	55.5			55.2			55.4	55.1
Effect of dilutive securities:
Restricted stock units and stock appreciation rights	0.2			0.2			0.3	0.2
Shares used in net income per common share – diluted	55.7			55.4			55.7	55.3
Net income per common share:
Basic	$ 2.39			$ 1.66			$ 7.24	$ 4.26
Diluted	$ 2.38			$ 1.66			$ 7.21	$ 4.24

Net Income Per Share - Addition

Net Income Per Share - Additional Information (Detail) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restricted Stock Units (RSUs) [Member]
Earnings Per Share [Line Items]
Number of shares excluded from computation of diluted earnings per share	0.1	0	0.1	0

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Total Stock-Based Compensation Expense Included in Company's Condensed Consolidated Statements of Operations and Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	$ 8.9	$ 7.4	$ 27.8	$ 22.7
Cost of Revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	0.9	1.2	2.8	3.1
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	1.1	1	3.3	3
Selling, General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	$ 6.9	5.1	$ 21.7	15.9
Acquisition and Integration Costs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense		$ 0.1		$ 0.7

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) $ in Millions	Sep. 30, 2021USD ($)
Compensation Related Costs [Abstract]
Total compensation expense related to unvested stock-based awards granted to employees, officers and directors	$ 43.5

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Activity for RSUs (Detail) - Stock Incentive Plan 2014 [Member] - Restricted Stock Units (RSUs) [Member]	9 Months Ended
	Sep. 30, 2021$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs/SARs, beginning of period | shares	600,000
Granted | shares	200,000
Vested | shares	(300,000)
RSUs/SARs, end of period | shares	500,000
RSUs/SARs, Weighted Average Grant Date Fair Value, Beginning of period | $ / shares	$ 93.26
Weighted Average Grant Date Fair Value, Granted | $ / shares	177.91
Weighted Average Grant Date Fair Value, Vested | $ / shares	95.47
RSUs/SARs, Weighted Average Grant Date Fair Value, end of period | $ / shares	$ 127.31

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($)	Oct. 25, 2021	Jul. 25, 2011	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase		$ 200,000,000
Stock repurchase, shares		2,600,000	0			0			0	0
Value of shares repurchased		$ 127,000,000
Cash dividends per common share			$ 0.22	$ 0.22	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.64	$ 0.60
Dividend payment to common shareholders									$ 35,500,000	$ 33,000,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Dividend declared date	Oct. 25, 2021
Cash dividend to be paid	$ 0.22
Dividend to be paid date	Dec. 10, 2021
Dividend declared, shareholders of record date	Nov. 29, 2021

Acquisition - Additional Inform

Acquisition - Additional Information (Detail) - Photon Control Inc [Member] $ in Thousands, $ in Millions	Jul. 15, 2021USD ($)	Jul. 15, 2021CAD ($)
Business Acquisition [Line Items]
Date of completed previously announced acquisition	Jul. 15, 2021	Jul. 15, 2021
Price per share of common stock in cash		$ 3,600
Business acquisition, total cash consideration	$ 302.7	$ 378,600

Acquisition - Summary of Purcha

Acquisition - Summary of Purchase Price (Detail) - USD ($) $ in Millions	Jul. 15, 2021	Sep. 30, 2021
Business Acquisition [Line Items]
Total purchase price, net of cash and cash equivalents acquired		$ 268.4
Photon Control, Inc. [Member]
Business Acquisition [Line Items]
Cash paid for outstanding shares	$ 302.7
Less: Cash and cash equivalents acquired	(34.3)
Total purchase price, net of cash and cash equivalents acquired	$ 268.4

Acquisition - Summary of Purc_2

Acquisition - Summary of Purchase Price (Parenthetical) (Detail) - Photon Control Inc [Member] shares in Millions	Jul. 15, 2021$ / sharesshares
Business Acquisition [Line Items]
Price per share of common stock | $ / shares	$ 3.60
Number of shares received per common shares | shares	105.2

Acquisition - Summary of Estima

Acquisition - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions	Jul. 15, 2021	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Acquisition Date [Line Items]
Goodwill		$ 1,226.2	$ 1,066.4	$ 1,058.5
Total purchase price, net of cash and cash equivalents acquired		$ 268.4
Photon Control Inc [Member]
Acquisition Date [Line Items]
Current assets	$ 51.4
Intangible assets	121
Goodwill	168.2
Other non-current assets	8.6
Total assets acquired	349.2
Current liabilities	13.7
Non-current deferred taxes	32.1
Other long-term liabilities	0.7
Total liabilities assumed	46.5
Fair value of assets acquired and liabilities assumed	302.7
Less: Cash and cash equivalents acquired	(34.3)
Total purchase price, net of cash and cash equivalents acquired	$ 268.4

Acquisition - Allocation of Acq

Acquisition - Allocation of Acquired Intangible Assets and Liabilities Related Estimates of Useful Lives (Detail) - Photon Control Inc [Member] $ in Millions	Jul. 15, 2021USD ($)
Acquired Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price	$ 121
Completed Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price	$ 110
Acquired intangible assets, estimated useful lives	9 years
Customer Relationships [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price	$ 9.4
Acquired intangible assets, estimated useful lives	10 years
Trade Names [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price	$ 0.2
Acquired intangible assets, estimated useful lives	6 months
Backlog [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price	$ 1.4
Acquired intangible assets, estimated useful lives	1 year 6 months

Business Segment, Geographic _3

Business Segment, Geographic Area, and Significant Customer Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2021Segment
Segment Reporting [Abstract]
Number of reportable segments	3

Business Segment, Geographic _4

Business Segment, Geographic Area, and Significant Customer Information - Net Revenues by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net revenues	$ 741.9	$ 589.8	$ 2,185.7	$ 1,669.8
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Net revenues	483.1	361.3	1,376.6	995.1
Light & Motion [Member]
Segment Reporting Information [Line Items]
Net revenues	208.7	175.9	583.6	507.3
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Net revenues	$ 50.1	$ 52.6	$ 225.5	$ 167.4

Business Segment, Geographic _5

Business Segment, Geographic Area, 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, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Gross profit	$ 348.4			$ 262			$ 1,025.7	$ 747.9
Research and development	51.7			42.5			148.9	127.7
Selling, general and administrative	95.8			87			288.9	260.3
Acquisition and integration costs	8.6			0.5			20.8	3.4
Restructuring and other	2			3.1			9.9	6.8
Amortization of intangible assets	15			12.5			40.1	42.6
Asset impairment								1.2
COVID-19 related net credits								(1.2)
Income from operations	175.3			116.4			517.1	307.1
Interest income	0.1			0.1			0.4	1.1
Interest expense	6.3			6.6			19.1	22.7
Other expense, net	2.9			1.1			11.5	3
Income before income taxes	166.2			108.8			486.9	282.5
Provision for income taxes	33.8			17.1			85.7	48
Net income	132.4	$ 146.5	$ 122.3	91.7	$ 73.7	$ 69.1	401.2	234.5
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Gross profit	226.3			163.5			643.8	444.1
Light & Motion [Member]
Segment Reporting Information [Line Items]
Gross profit	100.6			76			272.6	227.8
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Gross profit	$ 21.5			$ 22.5			$ 109.3	$ 76

Business Segment, Geographic _6

Business Segment, Geographic Area, and Significant Customer Information - Schedule of Capital Expenditures, Depreciation and Amortization Expense of Intangible Assets by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Capital expenditures	$ 20.5	$ 29	$ 63.3	$ 59.9
Depreciation and amortization	27.4	23.3	76.1	75.8
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Capital expenditures	10.8	9.7	27.2	28.8
Depreciation and amortization	5.1	5.1	17.3	15.1
Light & Motion [Member]
Segment Reporting Information [Line Items]
Capital expenditures	8.3	12.9	25	21.4
Depreciation and amortization	13.5	9.6	32.3	33.5
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Capital expenditures	1.4	6.4	11.1	9.7
Depreciation and amortization	$ 8.8	$ 8.6	$ 26.5	$ 27.2

Business Segment, Geographic _7

Business Segment, Geographic Area, and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Accounts receivable	$ 443.4	$ 392.7
Inventories	550.4	501.4
Total assets	993.8	894.1
Operating Segments [Member] | Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Accounts receivable	292.2	229.1
Inventories	317.9	273.3
Total assets	610.1	502.4
Operating Segments [Member] | Light & Motion [Member]
Segment Reporting Information [Line Items]
Accounts receivable	139.1	122.6
Inventories	170.9	166.1
Total assets	310	288.7
Operating Segments [Member] | Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Accounts receivable	36.7	51.7
Inventories	64.1	63.7
Total assets	100.8	115.4
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Accounts receivable	(24.6)	(10.7)
Inventories	(2.5)	(1.7)
Total assets	$ (27.1)	$ (12.4)

Business Segment, Geographic _8

Business Segment, Geographic Area, and Significant Customer Information - Reconciliation of Segment Assets to Consolidated Total Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Total segment assets	$ 993.8	$ 894.1
Cash and cash equivalents	633.3	608.3
Other current assets	121.5	74.3
Property, plant and equipment, net	316.8	284.3
Right-of-use assets	184.5	184.4
Other assets and long-term investments	47.6	45.6
Consolidated total assets	4,365.9	3,903.8
Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	879.6	836
Other current assets	121.5	74.3
Property, plant and equipment, net	316.8	284.3
Right-of-use assets	184.5	184.4
Goodwill and intangible assets, net	1,815.7	1,578.6
Other assets and long-term investments	54	52.1
Consolidated total assets	$ 4,365.9	$ 3,903.8

Business Segment, Geographic _9

Business Segment, Geographic Area, and Significant Customer Information - Schedule of Net Revenues and Long-Lived Assets by Geographic Regions (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 741.9	$ 589.8	$ 2,185.7	$ 1,669.8
Long-lived assets	539		539		$ 503.9
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	348.4	281.2	922.7	757.7
South Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	90.6	65.8	292.6	206.8
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	80.4	67.6	263.5	192.5
Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	44.1	27.8	164.8	73.3
Other Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	74	59.4	228.4	175.3
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	46.9	39.9	141.2	117.1
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	57.5	$ 48.1	172.5	$ 147.1
Long-lived assets	34.5		34.5		45.1
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	402.4		402.4		364
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 102.1		$ 102.1		$ 94.8

Business Segment, Geographic_10

Business Segment, Geographic Area, and Significant Customer Information - Summary of Goodwill Associated with Reportable Segments (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Goodwill	$ 1,226.2	$ 1,066.4	$ 1,058.5
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Goodwill	195.2	196.2
Light & Motion [Member]
Segment Reporting Information [Line Items]
Goodwill	556.3	395.3
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Goodwill	$ 474.7	$ 474.9

Business Segment, Geographic_11

Business Segment, Geographic Area, and Significant Customer Information - Summary of Net Revenues by Major Customers (Detail) - Sales Revenue, Net [Member] - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lam Research Corporation [Member]
Segment Reporting Information [Line Items]
Percentage of total net revenues	18.40%	14.10%	14.60%	12.30%
Applied Materials, Inc. [Member]
Segment Reporting Information [Line Items]
Percentage of total net revenues	10.60%	11.00%	10.70%	10.80%

Restructuring and Other - Addit

Restructuring and Other - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Other Cost [Line Items]
Restructuring charges	$ 1	$ 0.4	$ 5.9	$ 2
Other charges related to duplicate facility costs	$ 1	$ 2.7	$ 4	5.4
Newport Corporation [Member]
Restructuring Cost and Other Cost [Line Items]
Insurance reimbursement received				$ 0.5

Restructuring and Other - Sched

Restructuring and Other - Schedule of Company's Restructuring Activity (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring And Related Activities [Abstract]
Beginning of period			$ 0.3	$ 3.7
Restructuring charges	$ 1	$ 0.4	5.9	2
Payments and adjustments			(5.8)	(4.4)
End of period	$ 0.4	$ 1.3	$ 0.4	$ 1.3

Subsequent Events and Pending_2

Subsequent Events and Pending Acquisition - Additional Information (Details) $ in Thousands, € in Millions	Oct. 22, 2021USD ($)	Jul. 01, 2021USD ($)shares	Oct. 22, 2021EUR (€)
New Term Loan Facility [Member] | U.S. Dollar Tranche [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Borrowing capacity in the form of letters of credit	$ 4,700,000
Debt instrument, interest rate	2.25%
New Term Loan Facility [Member] | U.S. Dollar Tranche [Member] | Subsequent Event [Member] | Floor Rate [Member]
Subsequent Event [Line Items]
Debt instrument, interest rate	0.50%
New Term Loan Facility [Member] | U.S. Dollar Tranche [Member] | Subsequent Event [Member] | Original Issue Discount [Member]
Subsequent Event [Line Items]
Debt instrument, interest rate	0.25%
New Term Loan Facility [Member] | Euro Tranche | Subsequent Event [Member]
Subsequent Event [Line Items]
Borrowing capacity in the form of letters of credit	$ 600,000		€ 500
Debt instrument, interest rate	2.75%
New Term Loan Facility [Member] | Euro Tranche | Subsequent Event [Member] | Floor Rate [Member]
Subsequent Event [Line Items]
Debt instrument, interest rate	0.00%
New Term Loan Facility [Member] | Euro Tranche | Subsequent Event [Member] | Original Issue Discount [Member]
Subsequent Event [Line Items]
Debt instrument, interest rate	0.25%
Atotech Limited [Member]
Subsequent Event [Line Items]
Date of acquisition agreement		Jul. 1, 2021
Price per share of common stock in cash		$ 16,200
Number of shares received per common shares | shares		0.0552
Business acquisition, total cash consideration		$ 5,100,000
Atotech Limited [Member] | New Term Loan Facility [Member]
Subsequent Event [Line Items]
Senior secured credit facility		5,300,000
Atotech Limited [Member] | Revolving Lines of Credit [Member]
Subsequent Event [Line Items]
Senior secured credit facility		$ 500,000