Gartner (IT) 10-Q3 Nov 232023 Q3 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page - shares	9 Months Ended
Cover Page - shares	Sep. 30, 2023	Oct. 31, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	1-14443
Entity Registrant Name	Gartner, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-3099750
Entity Address, Address Line One	P.O. Box 10212
Entity Address, Address Line Two	56 Top Gallant Road
Entity Address, City or Town	Stamford,
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06902-7700
City Area Code	203
Local Phone Number	964-0096
Title of 12(b) Security	Common Stock, $.0005 par value per share
Trading Symbol	IT
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		77,948,612
Entity Central Index Key	0000749251
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false
Current Fiscal Year End Date	--12-31

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 1,249,355	$ 697,999
Fees receivable, net of allowances of $8,000 and $9,000, respectively	1,140,563	1,556,786
Deferred commissions	285,189	363,079
Prepaid expenses and other current assets	162,449	119,207
Assets held-for-sale	0	49,036
Total current assets	2,837,556	2,786,107
Property, equipment and leasehold improvements, net	259,890	264,581
Operating lease right-of-use assets	379,112	436,592
Goodwill	2,933,266	2,930,211
Intangible assets, net	519,115	584,714
Other assets	315,465	297,531
Total Assets	7,244,404	7,299,736
Current liabilities:
Accounts payable and accrued liabilities	908,558	1,115,198
Deferred revenues	2,394,556	2,443,762
Current portion of long-term debt	9,600	7,800
Liabilities held-for-sale	0	30,840
Total current liabilities	3,312,714	3,597,600
Long-term debt, net of deferred financing fees	2,449,913	2,453,607
Operating lease liabilities	531,048	597,267
Other liabilities	384,091	423,464
Total Liabilities	6,677,766	7,071,938
Stockholders’ Equity
Preferred stock, $0.01 par value, 5,000,000 shares authorized; none issued or outstanding	0	0
Common stock, $0.0005 par value, 250,000,000 shares authorized; 163,602,067 shares issued for both periods	82	82
Additional paid-in capital	2,291,013	2,179,604
Accumulated other comprehensive loss, net	(94,558)	(101,610)
Accumulated earnings	4,530,661	3,856,826
Treasury stock, at cost, 85,007,975 and 84,428,513 common shares, respectively	(6,160,560)	(5,707,104)
Total Stockholders’ Equity	566,638	227,798
Total Liabilities and Stockholders’ Equity	$ 7,244,404	$ 7,299,736

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Fees receivable, allowance	$ 8,000	$ 9,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0005	$ 0.0005
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares issued (in shares)	163,602,067	163,602,067
Treasury stock, common shares (in shares)	85,007,975	84,428,513

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues:
Total revenues	$ 1,408,784	$ 1,331,868	$ 4,320,838	$ 3,971,129
Costs and expenses:
Cost of services and product development	450,841	416,837	1,373,398	1,218,405
Selling, general and administrative	660,527	613,031	1,997,785	1,835,846
Depreciation	24,547	22,882	72,155	68,993
Amortization of intangibles	23,989	24,369	69,625	74,271
Acquisition and integration charges	4,463	1,331	7,804	5,827
Gain from sale of divested operation	0	0	(135,410)	0
Total costs and expenses	1,164,367	1,078,450	3,385,357	3,203,342
Operating income	244,417	253,418	935,481	767,787
Interest expense, net	(21,820)	(30,286)	(73,769)	(91,399)
Gain on event cancellation insurance claims	0	0	3,077	0
Other income, net	1,877	8,930	5,086	46,684
Income before income taxes	224,474	232,062	869,875	723,072
Provision for income taxes	44,465	58,517	196,040	172,087
Net income	$ 180,009	$ 173,545	$ 673,835	$ 550,985
Net income per share:
Basic (in dollars per share)	$ 2.28	$ 2.19	$ 8.51	$ 6.84
Diluted (in dollars per share)	$ 2.26	$ 2.17	$ 8.44	$ 6.77
Weighted average shares outstanding:
Basic (in shares)	78,923	79,259	79,220	80,516
Diluted (in shares)	79,520	80,059	79,862	81,373
Research
Revenues:
Total revenues	$ 1,218,739	$ 1,147,823	$ 3,643,815	$ 3,426,532
Conferences
Revenues:
Total revenues	57,200	77,031	290,739	200,910
Consulting
Revenues:
Total revenues	$ 132,845	$ 107,014	$ 386,284	$ 343,687

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 180,009	$ 173,545	$ 673,835	$ 550,985
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(13,171)	(29,961)	(4,407)	(62,190)
Interest rate swaps – net change in deferred gain or loss	3,707	3,886	11,359	13,125
Pension plans – net change in deferred actuarial loss	33	43	100	(52)
Other comprehensive income (loss), net of tax	(9,431)	(26,032)	7,052	(49,117)
Comprehensive income	$ 170,578	$ 147,513	$ 680,887	$ 501,868

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Changes in Stockholders’ Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss, Net	Accumulated Earnings	Treasury Stock
Beginning balance at Dec. 31, 2021	$ 371,058	$ 82	$ 2,074,896	$ (81,431)	$ 3,049,027	$ (4,671,516)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	172,515				172,515
Other comprehensive income (loss), net	(1,380)			(1,380)
Issuances under stock plans	6,964		579			6,385
Common share repurchases	(463,125)					(463,125)
Stock-based compensation expense	32,121		32,121
Ending balance at Mar. 31, 2022	118,153	82	2,107,596	(82,811)	3,221,542	(5,128,256)
Beginning balance at Dec. 31, 2021	371,058	82	2,074,896	(81,431)	3,049,027	(4,671,516)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	550,985
Other comprehensive income (loss), net	(49,117)
Ending balance at Sep. 30, 2022	(64,926)	82	2,161,940	(130,548)	3,600,012	(5,696,412)
Beginning balance at Mar. 31, 2022	118,153	82	2,107,596	(82,811)	3,221,542	(5,128,256)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	204,925				204,925
Other comprehensive income (loss), net	(21,705)			(21,705)
Issuances under stock plans	5,061		4,634			427
Common share repurchases	(473,755)					(473,755)
Stock-based compensation expense	24,454		24,454
Ending balance at Jun. 30, 2022	(142,867)	82	2,136,684	(104,516)	3,426,467	(5,601,584)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	173,545				173,545
Other comprehensive income (loss), net	(26,032)			(26,032)
Issuances under stock plans	4,994		4,288			706
Common share repurchases	(95,534)					(95,534)
Stock-based compensation expense	20,968		20,968
Ending balance at Sep. 30, 2022	(64,926)	82	2,161,940	(130,548)	3,600,012	(5,696,412)
Beginning balance at Dec. 31, 2022	227,798	82	2,179,604	(101,610)	3,856,826	(5,707,104)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	295,783				295,783
Other comprehensive income (loss), net	5,700			5,700
Issuances under stock plans	7,379		(2,141)			9,520
Common share repurchases	(108,850)					(108,850)
Stock-based compensation expense	45,048		45,048
Ending balance at Mar. 31, 2023	472,858	82	2,222,511	(95,910)	4,152,609	(5,806,434)
Beginning balance at Dec. 31, 2022	227,798	82	2,179,604	(101,610)	3,856,826	(5,707,104)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	673,835
Other comprehensive income (loss), net	7,052
Ending balance at Sep. 30, 2023	566,638	82	2,291,013	(94,558)	4,530,661	(6,160,560)
Beginning balance at Mar. 31, 2023	472,858	82	2,222,511	(95,910)	4,152,609	(5,806,434)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	198,043				198,043
Other comprehensive income (loss), net	10,783			10,783
Issuances under stock plans	5,899		4,313			1,586
Common share repurchases	(133,310)					(133,310)
Stock-based compensation expense	32,233		32,233
Ending balance at Jun. 30, 2023	586,506	82	2,259,057	(85,127)	4,350,652	(5,938,158)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	180,009				180,009
Other comprehensive income (loss), net	(9,431)			(9,431)
Issuances under stock plans	5,893		4,914			979
Common share repurchases	(223,381)					(223,381)
Stock-based compensation expense	27,042		27,042
Ending balance at Sep. 30, 2023	$ 566,638	$ 82	$ 2,291,013	$ (94,558)	$ 4,530,661	$ (6,160,560)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating activities:
Net income	$ 673,835	$ 550,985
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	141,780	143,264
Stock-based compensation expense	104,323	77,543
Deferred taxes	(49,550)	2,476
Gain from sale of divested operation	(135,410)	0
Loss on impairment of lease related assets	19,062	37,546
Reduction in the carrying amount of operating lease right-of-use assets	52,741	52,686
Amortization and write-off of deferred financing fees	3,506	3,420
Gain on de-designated swaps	(7,650)	(51,745)
Changes in assets and liabilities, net of acquisitions and divestitures:
Fees receivable, net	418,033	258,543
Deferred commissions	77,510	96,841
Prepaid expenses and other current assets	(39,204)	(19,936)
Other assets	(28,752)	6,371
Deferred revenues	(51,412)	92,527
Accounts payable and accrued and other liabilities	(247,405)	(352,208)
Cash provided by operating activities	931,407	898,313
Investing activities:
Additions to property, equipment and leasehold improvements	(75,145)	(70,461)
Acquisitions - cash paid (net of cash acquired)	(3,800)	(4,109)
Proceeds from sale of divested operation	156,057	0
Cash provided by (used in) investing activities	77,112	(74,570)
Financing activities:
Proceeds from employee stock purchase plan	19,115	16,980
Payments on borrowings	(5,400)	(3,996)
Purchases of treasury stock	(447,739)	(1,026,414)
Cash used in financing activities	(434,024)	(1,013,430)
Net increase (decrease) in cash and cash equivalents and restricted cash	574,495	(189,687)
Effects of exchange rates on cash and cash equivalents	(23,139)	(42,228)
Cash and cash equivalents and restricted cash, beginning of period	698,599	760,602
Cash and cash equivalents and restricted cash, end of period	$ 1,249,955	$ 528,687

Business and Basis of Presentat

Business and Basis of Presentation	9 Months Ended
Business and Basis of Presentation	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Basis of Presentation	Business and Basis of Presentation Business. Gartner, Inc. (NYSE: IT) delivers actionable, objective insight that drives smarter decisions and stronger performance on an organization’s mission-critical priorities. Segments . Gartner delivers its products and services globally through three business segments: Research, Conferences and Consulting. Revenues and other financial information for the Company’s segments are discussed in Note 7 — Segment Information. Basis of presentation . The accompanying interim Condensed Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”), as defined in Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 270 for interim financial information and with the applicable instructions of U.S. Securities and Exchange Commission (“SEC”) Rule 10-01 of Regulation S-X on Form 10-Q, and should be read in conjunction with the consolidated financial statements and related notes of the Company in its Annual Report on Form 10-K for the year ended December 31, 2022. The fiscal year of Gartner is the twelve-month period from January 1 through December 31. In the opinion of management, all normal recurring accruals and adjustments considered necessary for a fair presentation of financial position, results of operations and cash flows at the dates and for the periods presented herein have been included. The results of operations for the three and nine months ended September 30, 2023 may not be indicative of the results of operations for the remainder of 2023 or beyond. When used in these notes, the terms “Gartner,” the “Company,” “we,” “us,” or “our” refer to Gartner, Inc. and its consolidated subsidiaries. Principles of consolidation . The accompanying interim Condensed Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany transactions and balances have been eliminated. Use of estimates . The preparation of the accompanying interim Condensed Consolidated Financial Statements requires management to make estimates and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities, and reported amounts of revenues and expenses. Such estimates include the valuation of fees receivable, goodwill, intangible assets and other long-lived assets, as well as tax accruals and other liabilities. In addition, estimates are used in revenue recognition, income tax expense or benefit, performance-based compensation charges, depreciation and amortization. Management believes its use of estimates in these interim Condensed Consolidated Financial Statements to be reasonable. Management continually evaluates and revises its estimates using historical experience and other factors, including the general economic environment and actions it may take in the future. Management adjusts these estimates when facts and circumstances dictate. However, these estimates may involve significant uncertainties and judgments and cannot be determined with precision. In addition, these estimates are based on management’s best judgment at a point in time. As a result, differences between estimates and actual results could be material and would be reflected in the Company’s consolidated financial statements in future periods. Cash and cash equivalents and restricted cash. Below is a table presenting the beginning-of-period and end-of-period cash amounts from the Company’s Condensed Consolidated Balance Sheets and the total cash amounts presented in the Condensed Consolidated Statements of Cash Flows (in thousands). September 30, December 31, 2023 2022 Cash and cash equivalents $ 1,249,355 $ 697,999 Restricted cash classified in (1): Prepaid expenses and other current assets 600 — Other assets — 600 Cash and cash equivalents and restricted cash $ 1,249,955 $ 698,599 (1) Restricted cash consisted of an escrow account established in connection with one of the Company’s business acquisitions. Generally, such cash is restricted to use due to provisions contained in the underlying acquisition agreement. The Company will disburse the restricted cash to the sellers of the business upon satisfaction of any contingencies described in such agreements (e.g., potential indemnification claims, etc.). Revenue recognition. Revenue is recognized in accordance with the requirements of FASB ASC Topic 606, Revenue from Contracts with Customers (“ASC Topic 606”). Revenue is only recognized when all of the required criteria for revenue recognition have been met. The accompanying Condensed Consolidated Statements of Operations present revenue net of any sales or value-added taxes that we collect from customers and remit to government authorities. ASC Topic 270 requires certain disclosures in interim financial statements around the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Note 4 — Revenue and Related Matters provides additional information regarding the Company’s revenues. Gain on event cancellation insurance claims. In February 2023, the Company received $3.1 million of proceeds related to 2020 event cancellation insurance claims. The Company does not record any gain on insurance claims in excess of expenses incurred until the receipt of the insurance proceeds is deemed to be realizable. Adoption of new accounting standard. The Company adopted the accounting standard described below during the nine months ended September 30, 2023. Reference Rate Reform — In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform—Facilitation of the Effects of Reference Rate Reform on Financial Reporting (“ASU No. 2020-04”). ASU No. 2020-04 provides that an entity can elect not to apply certain required modification accounting in U.S. GAAP to contracts where all changes to the critical terms relate to reference rate reform (e.g., the expected discontinuance of LIBOR and the transition to an alternative reference interest rate, etc.). In addition, the rule provides optional expedients and exceptions that enable entities to continue to apply hedge accounting for hedging relationships where one or more of the critical terms change due to reference rate reform. The rule became effective for all entities as of March 12, 2020 and, after the issuance of ASU 2022-06, will generally no longer be available to apply after December 31, 2024. During 2023, the Company adopted the practical expedient provided under ASU 2020-04 related to its debt and interest rate swap arrangements and as such, the amendments in the second quarter of 2023 are treated as a continuation of the existing agreements and no gain or loss on the modification was recorded.

Acquisitions and Divestiture

Acquisitions and Divestiture	9 Months Ended
Acquisitions and Divestiture	Sep. 30, 2023
Business Combination and Asset Acquisition [Abstract]
Acquisitions and Divestiture	Acquisitions and Divestiture Acquisitions In September 2023, the Company acquired 100% of a formerly independent sales agent of Gartner research products in the Czech Republic for an aggregate purchase price of $7.9 million, including cash acquired and deferred consideration. The allocation of the purchase price is preliminary with respect to certain tax matters. In October 2022, the Company acquired 100% of the outstanding capital stock of UpCity, Inc. (“UpCity”), a privately-held company based in Chicago, Illinois, for an aggregate purchase price of $6.4 million. UpCity’s online marketplace helps small businesses by connecting them to ratings and reviews of more than 50,000 B2B service providers. Divestiture In February 2023, the Company completed the sale of a non-core business, TalentNeuron, for approximately $161.1 million after consideration of post-close adjustments. $156.1 million cash was received from the sale during the nine months ended September 30, 2023. The Company recorded a pre-tax gain of $135.4 million on the sale of TalentNeuron, which is included in Gain from sale of divested operation in the Condensed Consolidated Statement of Operations for the nine months ended September 30, 2023. TalentNeuron was included in the Company’s Research segment. The principal components of the assets divested included goodwill, intangible assets, net, property, equipment and leasehold improvements, net, and accounts receivable, with carrying amounts of $16.0 million, $9.5 million, $4.5 million and $11.8 million, respectively, while the liabilities transferred with the sale primarily consisted of deferred revenue with a carrying amount of $24.4 million. Such assets and liabilities were included in Assets held-for-sale and Liabilities held-for-sale, respectively, on the Condensed Consolidated Balance Sheet at December 31, 2022 at their respective carrying values at that date.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
Goodwill and Intangible Assets	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible AssetsGoodwill Goodwill represents the excess of the purchase price of acquired businesses over the estimated fair values of the tangible and identifiable intangible net assets acquired. Evaluations of the recoverability of goodwill are performed in accordance with FASB ASC Topic 350, which requires an annual assessment of potential goodwill impairment at the reporting unit level and whenever events or changes in circumstances indicate that the carrying value of goodwill may not be recoverable. When performing the annual assessment of the recoverability of goodwill, the Company initially performs a qualitative analysis evaluating whether any events or circumstances occurred or exist that provide evidence that it is more likely than not that the fair value of any of the Company’s reporting units is less than the related carrying amount. If the Company does not believe that it is more likely than not that the fair value of any of the Company’s reporting units is less than the related carrying amount, then no quantitative impairment test is performed. However, if the results of the qualitative assessment indicate that it is more likely than not that the fair value of a reporting unit is less than its respective carrying amount, then a quantitative impairment test is performed. Evaluating the recoverability of goodwill requires judgments and assumptions regarding future trends and events. As a result, both the precision and reliability of the estimates are subject to uncertainty. The Company’s most recent annual impairment test of goodwill was a qualitative analysis conducted during the quarter ended September 30, 2023 that indicated no impairment. Subsequent to completing the 2023 annual impairment test, there were no events or changes in circumstances noted that required an interim impairment test. The table below presents changes to the carrying amount of goodwill by segment during the nine months ended September 30, 2023 (in thousands). Research Conferences Consulting Total Balance at December 31, 2022 (1) $ 2,651,193 $ 183,951 $ 95,067 $ 2,930,211 Addition due to an acquisition (2) 4,176 — — 4,176 Foreign currency translation impact (1,267) — 146 (1,121) Balance at September 30, 2023 (1) $ 2,654,102 $ 183,951 $ 95,213 $ 2,933,266 (1) The Company does not have any accumulated goodwill impairment losses. (2) The addition was due to the acquisition of an independent sales agent in September 2023. See Note 2 - Acquisitions and Divestiture for additional information. Finite-Lived Intangible Assets The tables below present reconciliations of the carrying amounts of the Company’s finite-lived intangible assets as of the dates indicated (in thousands). September 30, 2023 Customer Technology-related Other Total Gross cost at December 31, 2022 $ 1,060,541 $ 11,200 $ 10,436 $ 1,082,177 Addition due to an acquisition (2) 990 — — 990 Intangible assets fully amortized (987) (39) — (1,026) Foreign currency translation impact 4,970 39 — 5,009 Gross cost 1,065,514 11,200 10,436 1,087,150 Accumulated amortization (1) (553,279) (8,400) (6,356) (568,035) Balance at September 30, 2023 $ 512,235 $ 2,800 $ 4,080 $ 519,115 December 31, 2022 Customer Technology-related Other Total Gross cost $ 1,060,541 11,200 $ 10,436 $ 1,082,177 Accumulated amortization (1) (486,260) (5,600) (5,603) (497,463) Balance at December 31, 2022 $ 574,281 $ 5,600 $ 4,833 $ 584,714 (1) Finite-lived intangible assets are amortized using the straight-line method over the following periods: Customer relationships—6 to 13 years; Technology-related—3 years; and Other—4 to 11 years. (2) The addition was due to the acquisition of an independent sales agent in September 2023. See Note 2 - Acquisitions and Divestiture for additional information. Amortization expense related to finite-lived intangible assets was $24.0 million and $24.4 million during the three months ended September 30, 2023 and 2022, respectively, and $69.6 million and $74.3 million during the nine months ended September 30, 2023 and 2022, respectively. The estimated future amortization expense by year for finite-lived intangible assets is presented in the table below (in thousands). 2023 (remaining three months) $ 22,777 2024 89,240 2025 80,573 2026 77,899 2027 77,290 Thereafter 171,336 $ 519,115

Revenue and Related Matters

Revenue and Related Matters	9 Months Ended
Revenue and Related Matters	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue and Related Matters	Revenue and Related Matters Disaggregated Revenue — The Company’s disaggregated revenue by reportable segment is presented in the tables below for the periods indicated (in thousands). By Primary Geographic Market (1) Three Months Ended September 30, 2023 Primary Geographic Market Research Conferences Consulting Total United States and Canada $ 822,401 $ 7,652 $ 87,409 $ 917,462 Europe, Middle East and Africa 261,813 30,398 29,502 321,713 Other International 134,525 19,150 15,934 169,609 Total revenues $ 1,218,739 $ 57,200 $ 132,845 $ 1,408,784 Three Months Ended September 30, 2022 Primary Geographic Market Research Conferences Consulting Total United States and Canada $ 771,534 $ 44,499 $ 67,194 $ 883,227 Europe, Middle East and Africa 245,093 18,034 26,644 289,771 Other International 131,196 14,498 13,176 158,870 Total revenues $ 1,147,823 $ 77,031 $ 107,014 $ 1,331,868 Nine Months Ended September 30, 2023 Primary Geographic Market Research Conferences Consulting Total United States and Canada $ 2,444,524 $ 179,670 $ 240,797 $ 2,864,991 Europe, Middle East and Africa 788,725 78,408 96,305 963,438 Other International 410,566 32,661 49,182 492,409 Total revenues $ 3,643,815 $ 290,739 $ 386,284 $ 4,320,838 Nine Months Ended September 30, 2022 Primary Geographic Market Research Conferences Consulting Total United States and Canada $ 2,264,733 $ 139,418 $ 208,799 $ 2,612,950 Europe, Middle East and Africa 763,639 40,308 93,135 897,082 Other International 398,160 21,184 41,753 461,097 Total revenues $ 3,426,532 $ 200,910 $ 343,687 $ 3,971,129 (1) Revenue is reported based on where the sale is fulfilled. The Company’s revenue is generated primarily through direct sales to clients by domestic and international sales forces and a network of independent international sales agents. Most of the Company’s products and services are provided on an integrated worldwide basis and, because of this integrated delivery approach, it is not practical to precisely separate the Company’s revenue by geographic location. Accordingly, revenue information presented in the above tables is based on internal allocations, which involve certain management estimates and judgments. By Timing of Revenue Recognition Three Months Ended September 30, 2023 Timing of Revenue Recognition Research Conferences Consulting Total Transferred over time (1) $ 1,125,285 $ — $ 99,719 $ 1,225,004 Transferred at a point in time (2) 93,454 57,200 33,126 183,780 Total revenues $ 1,218,739 $ 57,200 $ 132,845 $ 1,408,784 Three Months Ended September 30, 2022 Timing of Revenue Recognition Research Conferences Consulting Total Transferred over time (1) $ 1,045,425 $ — $ 90,316 $ 1,135,741 Transferred at a point in time (2) 102,398 77,031 16,698 196,127 Total revenues $ 1,147,823 $ 77,031 $ 107,014 $ 1,331,868 Nine Months Ended September 30, 2023 Timing of Revenue Recognition Research Conferences Consulting Total Transferred over time (1) $ 3,348,409 $ — $ 300,647 $ 3,649,056 Transferred at a point in time (2) 295,406 290,739 85,637 671,782 Total revenues $ 3,643,815 $ 290,739 $ 386,284 $ 4,320,838 Nine Months Ended September 30, 2022 Timing of Revenue Recognition Research Conferences Consulting Total Transferred over time (1) $ 3,109,099 $ — $ 281,953 $ 3,391,052 Transferred at a point in time (2) 317,433 200,910 61,734 580,077 Total revenues $ 3,426,532 $ 200,910 $ 343,687 $ 3,971,129 (1) Research revenues in this category are recognized in connection with performance obligations that are satisfied over time using a time-elapsed output method to measure progress. Consulting revenues in this category are recognized over time using labor hours as an input measurement. (2) The revenues in this category are recognized in connection with performance obligations that are satisfied at the point in time that the contractual deliverables are provided to the customer. Performance Obligations — For customer contracts that are greater than one year in duration, the aggregate amount of the transaction price allocated to performance obligations that were unsatisfied (or partially unsatisfied) as of September 30, 2023 was approximately $5.1 billion. The Company expects to recognize $0.9 billion, $2.7 billion and $1.5 billion of this revenue (most of which pertains to Research) during the remainder of 2023, the year ending December 31, 2024 and thereafter, respectively. The Company applies a practical expedient that is permitted under ASC Topic 606 and, accordingly, it does not disclose such performance obligation information for customer contracts that have original durations of one year or less. The Company’s performance obligations for contracts meeting this ASC Topic 606 disclosure exclusion primarily include: (i) stand-ready services under Research subscription contracts; (ii) holding conferences and meetings where attendees and exhibitors can participate; and (iii) providing customized Consulting solutions for clients under fixed fee and time and materials engagements. The remaining duration of these performance obligations is generally less than one year, which aligns with the period that the parties have enforceable rights and obligations under the affected contracts. Customer Contract Assets and Liabilities — The timing of the recognition of revenue and the amount and timing of the Company’s billings and cash collections, including upfront customer payments, result in the recognition of both assets and liabilities on the Company’s Condensed Consolidated Balance Sheets. The table below provides information regarding certain of the Company’s balance sheet accounts that pertain to its contracts with customers (in thousands). September 30, December 31, 2023 2022 Assets: Fees receivable, gross (1) $ 1,148,563 $ 1,565,786 Contract assets recorded in Prepaid expenses and other current assets (2) $ 32,754 $ 21,183 Contract liabilities: Deferred revenues (current liability) (3) $ 2,394,556 $ 2,443,762 Non-current deferred revenues recorded in Other liabilities (3) 26,757 39,115 Total contract liabilities $ 2,421,313 $ 2,482,877 (1) Fees receivable represent an unconditional right to payment from the Company’s customers and include both billed and unbilled amounts. (2) Contract assets represent recognized revenue for which the Company does not have an unconditional right to payment as of the balance sheet date because the project may be subject to a progress billing milestone or some other billing restrictions. (3) Deferred revenues represent amounts (i) for which the Company has received an upfront customer payment or (ii) that pertain to recognized fees receivable. Both situations occur before the completion of the Company’s performance obligation(s).

Computation of Earnings Per Sha

Computation of Earnings Per Share	9 Months Ended
Computation of Earnings Per Share	Sep. 30, 2023
Earnings Per Share [Abstract]
Computation of Earnings Per Share	Computation of Earnings Per Share Basic earnings per share (“EPS”) is computed by dividing net income by the weighted average number of shares of Common Stock outstanding during the period. Diluted EPS reflects the potential dilution of securities that could share in earnings. Potential shares of common stock are excluded from the computation of diluted earnings per share when their effect would be anti-dilutive. The table below sets forth the calculation of basic and diluted income per share for the periods indicated (in thousands, except per share data). Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Numerator: Net income used for calculating basic and diluted income per share $ 180,009 $ 173,545 $ 673,835 $ 550,985 Denominator: Weighted average common shares used in the calculation of basic income per share 78,923 79,259 79,220 80,516 Dilutive effect of outstanding awards associated with stock-based compensation plans (1) 597 800 642 857 Shares used in the calculation of diluted income per share 79,520 80,059 79,862 81,373 Basic income per share $ 2.28 $ 2.19 $ 8.51 $ 6.84 Diluted income per share $ 2.26 $ 2.17 $ 8.44 $ 6.77

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
Stock-Based Compensation	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company grants stock-based compensation awards as an incentive for employees and directors to contribute to the Company’s long-term success. The Company currently awards stock-settled stock appreciation rights, service-based and performance-based restricted stock units, and common stock equivalents. As of September 30, 2023, the Company had 6.0 million shares of its common stock, par value $0.0005 per share, (the “Common Stock”) available for stock-based compensation awards under the Gartner, Inc. Long-Term Incentive Plan as amended and restated in June 2023 (the “Plan”). The tables below summarize the Company’s stock-based compensation expense by award type and expense category line item during the periods indicated (in millions). Three Months Ended Nine Months Ended September 30, September 30, Award type 2023 2022 2023 2022 Stock appreciation rights $ 2.5 $ 2.2 $ 8.1 $ 6.6 Restricted stock units 24.3 18.6 95.4 70.4 Common stock equivalents 0.3 0.2 0.9 0.6 Total (1) $ 27.1 $ 21.0 $ 104.4 $ 77.6 Three Months Ended Nine Months Ended September 30, September 30, Expense category line item 2023 2022 2023 2022 Cost of services and product development $ 11.5 $ 7.6 $ 42.5 $ 27.0 Selling, general and administrative 15.6 13.4 61.9 50.6 Total (1) $ 27.1 $ 21.0 $ 104.4 $ 77.6 (1) Includes costs of $8.5 million and $5.4 million during the three months ended September 30, 2023 and 2022, respectively, and $48.4 million and $32.7 million during the nine months ended September 30, 2023 and 2022, respectively, for awards to retirement-eligible employees. Those awards vest on an accelerated basis.

Segment Information

Segment Information	9 Months Ended
Segment Information	Sep. 30, 2023
Segment Reporting [Abstract]
Segment Information	Segment InformationThe Company’s products and services are delivered through three segments – Research, Conferences and Consulting, as described below. • Research equips executives and their teams from every function and across all industries with actionable, objective insight, guidance and tools. Our experienced experts deliver all this value informed by an unmatched combination of practitioner-sourced and data-driven research to help our clients address their mission critical priorities. • Conferences provides executives and teams across an organization the opportunity to learn, share and network. From our Gartner Symposium/Xpo series, to industry-leading conferences focused on specific business roles and topics, to peer-driven sessions, our offerings enable attendees to experience the best of Gartner insight and guidance. • Consulting serves senior executives leading technology-driven strategic initiatives leveraging the power of Gartner’s actionable, objective insight. Through custom analysis and on-the-ground support we enable optimized technology investments and stronger performance on our clients’ mission critical priorities. The Company evaluates segment performance and allocates resources based on gross contribution margin. Gross contribution, as presented in the tables below, is defined as operating income or loss excluding certain Cost of services and product development expenses, Selling, general and administrative expenses, Depreciation, Amortization of intangibles, Acquisition and integration charges and Gain from sale of divested operation. Certain bonus and fringe benefit costs included in consolidated Cost of services and product development are not allocated to segment expense. The accounting policies used by the reportable segments are the same as those used by the Company. There are no intersegment revenues. The Company does not identify or allocate assets, including capital expenditures, by reportable segment. Accordingly, assets are not reported by segment because the information is not available by segment and is not reviewed in the evaluation of segment performance or in making decisions regarding the allocation of resources. The tables below present information about the Company’s reportable segments for the periods indicated (in thousands). Three Months Ended September 30, 2023 Research Conferences Consulting Consolidated Revenues $ 1,218,739 $ 57,200 $ 132,845 $ 1,408,784 Gross contribution 894,149 20,449 48,551 963,149 Corporate and other expenses (718,732) Operating income $ 244,417 Three Months Ended September 30, 2022 Research Conferences Consulting Consolidated Revenues $ 1,147,823 $ 77,031 $ 107,014 $ 1,331,868 Gross contribution 848,438 40,318 37,213 925,969 Corporate and other expenses (672,551) Operating income $ 253,418 Nine Months Ended September 30, 2023 Research Conferences Consulting Consolidated Revenues $ 3,643,815 $ 290,739 $ 386,284 $ 4,320,838 Gross contribution 2,678,945 145,687 146,680 2,971,312 Corporate and other expenses (2,035,831) Operating income $ 935,481 Nine Months Ended September 30, 2022 Research Conferences Consulting Consolidated Revenues $ 3,426,532 $ 200,910 $ 343,687 $ 3,971,129 Gross contribution 2,541,782 110,968 138,448 2,791,198 Corporate and other expenses (2,023,411) Operating income $ 767,787 The table below provides a reconciliation of total segment gross contribution to net income for the periods indicated (in thousands). Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Total segment gross contribution $ 963,149 $ 925,969 $ 2,971,312 $ 2,791,198 Costs and expenses: Cost of services and product development - unallocated (1) 5,206 10,938 23,872 38,474 Selling, general and administrative 660,527 613,031 1,997,785 1,835,846 Depreciation and amortization 48,536 47,251 141,780 143,264 Acquisition and integration charges 4,463 1,331 7,804 5,827 Gain from sale of divested operation — — (135,410) — Operating income 244,417 253,418 935,481 767,787 Interest expense and other, net (19,943) (21,356) (68,683) (44,715) Gain on event cancellation insurance claims — — 3,077 — Less: Provision for income taxes 44,465 58,517 196,040 172,087 Net income $ 180,009 $ 173,545 $ 673,835 $ 550,985 (1) The unallocated amounts consist of certain bonus and fringe costs recorded in consolidated Cost of services and product development that are not allocated to segment expense. The Company’s policy is to allocate bonuses to segments at 100% of a segment employee’s target bonus. Amounts above or below 100% are absorbed by corporate.

Debt

Debt	9 Months Ended
Debt	Sep. 30, 2023
Debt Disclosure [Abstract]
Debt	Debt The Company’s total outstanding borrowings are summarized in the table below (in thousands). September 30, December 31, Description 2023 2022 2020 Credit Agreement - Term loan facility (1) $ 276,800 $ 282,200 2020 Credit Agreement - Revolving credit facility (1), (2) — — Senior Notes due 2028 (“2028 Notes”) (3) 800,000 800,000 Senior Notes due 2029 (“2029 Notes”) (4) 600,000 600,000 Senior Notes due 2030 (“2030 Notes”) (5) 800,000 800,000 Other (6) 5,000 5,000 Principal amount outstanding (7) 2,481,800 2,487,200 Less: deferred financing fees (8) (22,287) (25,793) Net balance sheet carrying amount $ 2,459,513 $ 2,461,407 (1) The contractual annualized interest rate as of September 30, 2023 on the amended 2020 Credit Agreement Term loan facility and the Revolving credit facility was 6.725%, which consisted of Term Secured Overnight Financing Rate ("SOFR") of 5.375% plus a margin of 1.350%. However, the Company has an interest rate swap contract that effectively converts the floating SOFR on outstanding amounts to a fixed base rate. (2) The Company had approximately $1.0 billion of available borrowing capacity on the 2020 Credit Agreement revolver (not including the expansion feature) as of September 30, 2023. (3) Consists of $800.0 million principal amount of 2028 Notes outstanding. The 2028 Notes bear interest at a fixed rate of 4.50% and mature on July 1, 2028. (4) Consists of $600.0 million principal amount of 2029 Notes outstanding. The 2029 Notes bear interest at a fixed rate of 3.625% and mature on June 15, 2029. (5) Consists of $800.0 million principal amount of 2030 Notes outstanding. The 2030 Notes bear interest at a fixed rate of 3.75% and mature on October 1, 2030. (6) Consists of a State of Connecticut economic development loan originated in 2019 with a 10-year maturity and bears interest at a fixed rate of 1.75%. This loan may be repaid at any time by the Company without penalty. (7) The weighted average annual effective rate on the Company’s outstanding debt for the three and nine months ended September 30, 2023, including the effects of its interest rate swaps discussed below, was 4.98% and 5.01%, respectively. (8) Deferred financing fees are being amortized to Interest expense, net over the term of the related debt obligation. 2029 Notes On June 18, 2021, the Company issued $600.0 million aggregate principal amount of 3.625% Senior Notes due 2029. The 2029 Notes were issued pursuant to an indenture, dated as of June 18, 2021 (the “2029 Note Indenture”), among the Company, the guarantors party thereto and U.S. Bank National Association, as trustee. The 2029 Notes were issued at an issue price of 100.0% and bear interest at a rate of 3.625% per annum. Interest on the 2029 Notes is payable on June 15 and December 15 of each year, beginning on December 15, 2021. The 2029 Notes will mature on June 15, 2029. The Company may redeem some or all of the 2029 Notes at any time on or after June 15, 2024 for cash at the redemption prices set forth in the 2029 Notes Indenture, plus accrued and unpaid interest to, but excluding, the redemption date. Prior to June 15, 2024, the Company may redeem up to 40% of the aggregate principal amount of the 2029 Notes in connection with certain equity offerings, or some or all of the 2029 Notes with a “make-whole” premium, in each case subject to the terms set forth in the 2029 Note Indenture. 2030 Notes On September 28, 2020, the Company issued $800.0 million aggregate principal amount of 3.75% Senior Notes due 2030. The 2030 Notes were issued pursuant to an indenture, dated as of September 28, 2020 (the “2030 Note Indenture”), among the Company, the guarantors party thereto and U.S. Bank National Association, as trustee. The 2030 Notes were issued at an issue price of 100.0% and bear interest at a rate of 3.75% per annum. Interest on the 2030 Notes is payable on April 1 and October 1 of each year, beginning on April 1, 2021. The 2030 Notes will mature on October 1, 2030. The Company may redeem some or all of the 2030 Notes at any time on or after October 1, 2025 for cash at the redemption prices set forth in the 2030 Note Indenture, plus accrued and unpaid interest to, but excluding, the redemption date. Prior to October 1, 2025, the Company may redeem up to 40% of the aggregate principal amount of the 2030 Notes in connection with certain equity offerings, or some or all of the 2030 Notes with a “make-whole” premium, in each case subject to the terms set forth in the 2030 Note Indenture. 2028 Notes On June 22, 2020, the Company issued $800.0 million aggregate principal amount of 4.50% Senior Notes due 2028. The 2028 Notes were issued pursuant to an indenture, dated as of June 22, 2020 (the “2028 Note Indenture”), among the Company, the guarantors party thereto and U.S. Bank National Association, as trustee. The 2028 Notes were issued at an issue price of 100.0% and bear interest at a rate of 4.50% per annum. Interest on the 2028 Notes is payable on January 1 and July 1 of each year, beginning on January 1, 2021. The 2028 Notes will mature on July 1, 2028. The Company may redeem some or all of the 2028 Notes at any time on or after July 1, 2023 for cash at the redemption prices set forth in the 2028 Note Indenture, plus accrued and unpaid interest to, but excluding, the redemption date. Prior to July 1, 2023, the Company may redeem up to 40% of the aggregate principal amount of the 2028 Notes in connection with certain equity offerings, or some or all of the 2028 Notes with a “make-whole” premium, in each case subject to the terms set forth in the 2028 Note Indenture. 2020 Credit Agreement The Company has a credit facility that currently provides for a $400.0 million Term loan facility and a $1.0 billion Revolving credit facility (the “2020 Credit Agreement”). The 2020 Credit Agreement contains certain customary restrictive loan covenants, including, among others, financial covenants that apply a maximum consolidated leverage ratio and a minimum consolidated interest expense coverage ratio. The Company was in compliance with all financial covenants as of September 30, 2023. The Term loan is being repaid in consecutive quarterly installments that commenced on December 31, 2020, plus a final payment to be made on September 28, 2025. The Revolving credit facility may be borrowed, repaid and re-borrowed through September 28, 2025, at which all then-outstanding amounts must be repaid. In May 2023, the Company entered into an amendment of the 2020 Credit Agreement that replaced the interest rate benchmark from LIBOR to Secured Overnight Financing Rate (“SOFR”). After the amendment, interest is accrued on outstanding balances under the credit facility and payable monthly at a rate of the one month Term SOFR plus 10 basis points and the applicable margin. Prior to the amendment, interest was accrued at a rate of the one month LIBOR plus the applicable margin. Interest Rate Swaps As of September 30, 2023, the Company had one fixed-for-floating interest rate swap contract with a notional value of $350.0 million that matures in 2025. In May 2023, in conjunction with the amendment of the 2020 credit agreement, the Company entered into an amendment of its interest rate swap contract. Under the amended agreement, the Company pays a base fixed rate of 2.98% and in return receives a floating Term SOFR base rate on 30-day notional borrowings. Prior to the amendment, the Company paid a base fixed rate of 3.04% and in return received a floating Eurodollar base rate on 30-day notional borrowings. Effective June 30, 2020, the Company de-designated all of its interest rate swaps and discontinued hedge accounting. Accordingly, subsequent changes to the fair value of the interest rate swaps are recorded in Other income, net. The amounts previously recorded in Accumulated other comprehensive loss are amortized into Interest expense, net over the terms of the hedged forecasted interest payments. As of September 30, 2023, $37.2 million is remaining in Accumulated other comprehensive loss, net. See Note 11 — Derivatives and Hedging for the amounts remaining in Accumulated other comprehensive loss, net of tax effect, at September 30, 2023 and December 31, 2022. See Note 12 — Fair Value Disclosures for a discussion of the fair values of Company’s interest rate swaps.

Equity

Equity	9 Months Ended
Equity	Sep. 30, 2023
Stockholders' Equity Note [Abstract]
Equity	Equity Share Repurchase Authorization In 2015, the Company’s Board of Directors (the “Board”) authorized a share repurchase program to repurchase up to $1.2 billion of the Company’s common stock. The Board authorized incremental share repurchases of up to an additional $1.6 billion, $1.0 billion and $0.4 billion of the Company’s common stock during 2021, 2022, and February 2023, respectively. As of September 30, 2023, $610.8 million remained available under the share repurchase program. The Company may repurchase its common stock from time-to-time in amounts, at prices and in the manner that the Company deems appropriate, subject to the availability of stock, prevailing market conditions, the trading price of the stock, the Company’s financial performance and other conditions. Repurchases may be made through open market purchases (which may include repurchase plans designed to comply with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended), accelerated share repurchases, private transactions or other transactions and will be funded by cash on hand and borrowings. Repurchases may also be made from time-to-time in connection with the settlement of the Company’s stock-based compensation awards. The Company’s share repurchase activity is presented in the table below for the periods indicated. Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Number of shares repurchased (1) 648,616 375,076 1,400,129 3,783,922 Cash paid for repurchased shares (in thousands) (2) $ 209,367 $ 96,534 $ 447,739 $ 1,026,414 (1) The average purchase price for repurchased shares was $341.11 and $254.71 for the three months ended September 30, 2023 and 2022, respectively, and $330.50 and $272.84 for the nine months ended September 30, 2023 and 2022, respectively. The repurchased shares during the three and nine months ended September 30, 2023 and 2022 included purchases for both open market purchases and stock-based compensation award settlements. (2) The cash paid for repurchased shares during the nine months ended September 30, 2023 excluded $15.0 million of open market purchases with trade dates in September 2023 that settled in October 2023 and $2.8 million of excise tax accrued. The cash paid for repurchased shares during the nine months ended September 30, 2022 excluded $6.0 million of open market purchases with trade dates in September 2022 that settled in October 2022. The cash paid for repurchased shares during the three months ended September 30, 2023 included $3.1 million of open market purchases with trade dates in June 2023 that settled in July 2023, and excluded $15.0 million of open market purchases with trade dates in September 2023 that settled in October 2023. The cash paid for repurchased shares during the three months ended September 30, 2022 included $7.0 million of open market purchases with trade dates in June 2022 that settled in July 2022, and excluded $6.0 million of open market purchases with trade dates in September 2022 that settled in October 2022. Accumulated Other Comprehensive Loss, net (“AOCL”) The tables below provide information about the changes in AOCL by component and the related amounts reclassified out of AOCL to income during the periods indicated (net of tax, in thousands) (1). Three Months Ended September 30, 2023 Interest Rate Defined Foreign Total Balance – June 30, 2023 $ (31,596) $ (4,180) $ (49,351) $ (85,127) Other comprehensive income (loss) activity during the period: Change in AOCL before reclassifications to income — — (13,171) (13,171) Reclassifications from AOCL to income (2), (3) 3,707 33 — 3,740 Other comprehensive income (loss), net 3,707 33 (13,171) (9,431) Balance – September 30, 2023 $ (27,889) $ (4,147) $ (62,522) $ (94,558) Three Months Ended September 30, 2022 Interest Rate Defined Foreign Total Balance – June 30, 2022 $ (47,084) $ (6,767) $ (50,665) $ (104,516) Other comprehensive income (loss) activity during the period: Change in AOCL before reclassifications to income — — (29,961) (29,961) Reclassifications from AOCL to income (2), (3) 3,886 43 — 3,929 Other comprehensive income (loss), net 3,886 43 (29,961) (26,032) Balance – September 30, 2022 $ (43,198) $ (6,724) $ (80,626) $ (130,548) Nine Months Ended September 30, 2023 Interest Rate Defined Foreign Total Balance – December 31, 2022 $ (39,248) $ (4,247) $ (58,115) $ (101,610) Other comprehensive income (loss) activity during the period: Change in AOCL before reclassifications to income — — (4,407) (4,407) Reclassifications from AOCL to income (2), (3) 11,359 100 — 11,459 Other comprehensive income (loss), net 11,359 100 (4,407) 7,052 Balance – September 30, 2023 $ (27,889) $ (4,147) $ (62,522) $ (94,558) Nine Months Ended September 30, 2022 Interest Rate Defined Foreign Total Balance – December 31, 2021 $ (56,323) $ (6,672) $ (18,436) $ (81,431) Other comprehensive income (loss) activity during the period: Change in AOCL before reclassifications to income — (189) (62,190) (62,379) Reclassifications from AOCL to income (2), (3) 13,125 137 — 13,262 Other comprehensive income (loss), net 13,125 (52) (62,190) (49,117) Balance – September 30, 2022 $ (43,198) $ (6,724) $ (80,626) $ (130,548) (1) Amounts in parentheses represent debits (deferred losses). (2) $4.9 million and $5.2 million of the reclassifications related to interest rate swaps (cash flow hedges) were recorded in Interest expense, net, for the three months ended September 30, 2023 and 2022, respectively. $15.2 million and $17.5 million of the reclassifications related to interest rate swaps (cash flow hedges) were recorded in Interest expense, net, for the nine months ended September 30, 2023 and 2022, respectively. See Note 8 — Debt and Note 11 — Derivatives and Hedging for information regarding the cash flow hedges. (3) The reclassifications related to defined benefit pension plans were recorded in Other income, net.

Income Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes was $44.5 million and $58.5 million for the three months ended September 30, 2023 and 2022, respectively. The effective income tax rate was 19.8% and 25.2% for the three months ended September 30, 2023 and 2022, respectively. The decrease in the effective income tax rate was primarily due to the favorable impact of a foreign tax credit notice issued by the IRS as well as the expiration of statutes for uncertain tax positions in the three months ended September 30, 2023 as compared to the same period in 2022. The provision for income taxes was $196.0 million and $172.1 million for the nine months ended September 30, 2023 and 2022, respectively. The effective income tax rate was 22.5% and 23.8% for the nine months ended September 30, 2023 and 2022, respectively. The decrease in the year to date effective income tax rate in 2023 was primarily due to the impact of valuation allowance releases and the expiration of statutes for uncertain tax positions in the nine months ended September 30, 2023 as compared to the same period in 2022. The 2023 decrease was partially offset by an increase in the effective income tax rate for the sale of the TalentNeuron business. The Company had gross unrecognized tax benefits of $140.1 million on September 30, 2023 and $137.2 million on December 31, 2022. It is reasonably possible that gross unrecognized tax benefits will decrease by approximately $5.3 million within the next twelve months due to the anticipated closure of audits and the expiration of certain statutes of limitation.

Derivatives and Hedging

Derivatives and Hedging	9 Months Ended
Derivatives and Hedging	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging	Derivatives and HedgingThe Company enters into a limited number of derivative contracts to mitigate the cash flow risk associated with changes in interest rates on variable-rate debt and changes in foreign exchange rates on forecasted foreign currency transactions. The Company accounts for its outstanding derivative contracts in accordance with FASB ASC Topic 815, which requires all derivatives, including derivatives designated as accounting hedges, to be recorded on the balance sheet at fair value. The tables below provide information regarding the Company’s outstanding derivative contracts as of the dates indicated (in thousands, except for number of contracts). September 30, 2023 Derivative Contract Type Number of Notional Fair Value Balance Unrealized Interest rate swaps (1) 1 $ 350,000 $ 4,746 Other assets $ (27,889) 8,117 Other current assets Foreign currency forwards (2) 32 168,810 (185) Accrued liabilities — Total 33 $ 518,810 $ 12,678 $ (27,889) December 31, 2022 Derivative Contract Type Number of Contracts Notional Fair Value Balance Unrealized Interest rate swaps (1) 1 $ 350,000 $ 3,952 Other assets $ (39,248) 6,346 Other current assets Foreign currency forwards (2) 138 687,763 625 Other current assets — Total 139 $ 1,037,763 $ 10,923 $ (39,248) (1) Effective June 30, 2020, the Company de-designated all of its interest rate swaps and discontinued hedge accounting. Accordingly, subsequent changes to fair value of the interest rate swaps are recorded in Other income, net. The amounts previously recorded in Accumulated other comprehensive loss are amortized into Interest expense, net over the terms of the hedged forecasted interest payments. See Note 8 — Debt for additional information regarding the Company’s interest rate swap contracts. (2) The Company has foreign exchange transaction risk because it typically enters into transactions in the normal course of business that are denominated in foreign currencies that differ from the local functional currency. The Company enters into short-term foreign currency forward exchange contracts to mitigate the cash flow risk associated with changes in foreign currency rates on forecasted foreign currency transactions. These contracts are accounted for at fair value with realized and unrealized gains and losses recognized in Other income, net because the Company does not designate these contracts as hedges for accounting purposes. All of the outstanding foreign currency forward exchange contracts at September 30, 2023 matured before October 31, 2023. (3) See Note 12 — Fair Value Disclosures for the determination of the fair values of these instruments. At September 30, 2023, all of the Company’s derivative counterparties were investment grade financial institutions. The Company did not have any collateral arrangements with its derivative counterparties and none of the derivative contracts contained credit-risk related contingent features. The table below provides information regarding amounts recognized in the accompanying Condensed Consolidated Statements of Operations for derivative contracts for the periods indicated (in thousands). Three Months Ended Nine Months Ended September 30, September 30, Amount recorded in: 2023 2022 2023 2022 Interest expense, net (1) $ 4,948 $ 5,185 $ 15,159 $ 17,515 Other (income) expense, net (2,567) 1,295 (8,367) (17,456) Total (income) expense, net $ 2,381 $ 6,480 $ 6,792 $ 59 (1) Consists of interest expense from interest rate swap contracts.

Fair Value Disclosures

Fair Value Disclosures	9 Months Ended
Fair Value Disclosures	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Disclosures	Fair Value Disclosures The Company’s financial instruments include cash equivalents, fees receivable from customers, accounts payable and accrued liabilities, all of which are normally short-term in nature. The Company believes that the carrying amounts of these financial instruments reasonably approximate their fair values due to their short-term nature. The Company’s financial instruments also include its outstanding variable-rate borrowings under the 2020 Credit Agreement. The Company believes that the carrying amounts of its variable-rate borrowings reasonably approximate their fair values because the rates of interest on those borrowings reflect current market rates of interest for similar instruments with comparable maturities. The Company enters into a limited number of derivatives transactions but does not enter into repurchase agreements, securities lending transactions or master netting arrangements. Receivables or payables that result from derivatives transactions are recorded gross in the Company’s Condensed Consolidated Balance Sheets. FASB ASC Topic 820 provides a framework for the measurement of fair value and a valuation hierarchy based on the transparency of inputs used in the valuation of assets and liabilities. Classification within the valuation hierarchy is based on the lowest level of input that is significant to the resulting fair value measurement. The valuation hierarchy contains three levels. Level 1 measurements consist of quoted prices in active markets for identical assets or liabilities. Level 2 measurements include significant other observable inputs such as quoted prices for similar assets or liabilities in active markets; identical assets or liabilities in inactive markets; observable inputs such as interest rates and yield curves; and other market-corroborated inputs. Level 3 measurements include significant unobservable inputs such as internally-created valuation models. Generally, the Company does not utilize Level 3 valuation inputs to remeasure any of its assets or liabilities. However, Level 3 inputs may be used by the Company when certain long-lived assets, including identifiable intangible assets, goodwill, and right-of-use assets are measured at fair value on a nonrecurring basis when there are indicators of impairment. Additionally, Level 3 inputs may be used by the Company in its required annual impairment review of goodwill. Information regarding the periodic assessment of the Company’s goodwill is included in Note 3 — Goodwill and Intangible Assets. The Company does not typically transfer assets or liabilities between different levels of the valuation hierarchy. The table below presents the fair values of certain financial assets and liabilities that are measured at fair value on a recurring basis in the Company's financial statements (in thousands). Description September 30, December 31, Assets: Values based on Level 1 inputs: Deferred compensation plan assets (1) $ 12,683 $ 6,065 Total Level 1 inputs 12,683 6,065 Values based on Level 2 inputs: Deferred compensation plan assets (1) 91,224 84,318 Foreign currency forward contracts (2) 193 3,236 Interest rate swap contract (3) 12,863 10,298 Total Level 2 inputs 104,280 97,852 Total Assets $ 116,963 $ 103,917 Liabilities: Values based on Level 2 inputs: Deferred compensation plan liabilities (1) $ 109,778 $ 96,641 Foreign currency forward contracts (2) 378 2,611 Total Level 2 inputs 110,156 99,252 Total Liabilities $ 110,156 $ 99,252 (1) The Company has a deferred compensation plan for the benefit of certain highly compensated officers, managers and other key employees. The assets consist of investments in money market funds, mutual funds and company-owned life insurance contracts, which are valued based on Level 1 or Level 2 inputs. The related deferred compensation plan liabilities are recorded at fair value, or the estimated amount needed to settle the liability, which the Company considers to be a Level 2 input. (2) The Company enters into foreign currency forward exchange contracts to hedge the effects of adverse fluctuations in foreign currency exchange rates (see Note 11 — Derivatives and Hedging). Valuation of these contracts is based on observable foreign currency exchange rates in active markets, which the Company considers to be a Level 2 input. (3) The Company has an interest rate swap contract that hedges the risk of variability from interest payments on its borrowings (see Note 8 — Debt). The fair value of the interest rate swap is based on mark-to-market valuations prepared by a third-party broker. This valuation is based on observable interest rates from recently executed market transactions and other observable market data, which the Company considers to be Level 2 inputs. The Company independently corroborates the reasonableness of the valuations prepared by the third-party broker by using an electronic quotation service. The table below presents the carrying amounts (net of deferred financing costs) and fair values of financial instruments that are not recorded at fair value in the Company’s Condensed Consolidated Balance Sheets (in thousands). The estimated fair value of the financial instruments was derived from quoted market prices provided by an independent dealer, which the Company considers to be a Level 2 input. Carrying Amount Fair Value September 30, December 31, September 30, December 31, Description 2023 2022 2023 2022 2028 Notes $ 793,794 $ 792,934 $ 729,888 $ 740,864 2029 Notes 594,580 593,951 514,578 523,842 2030 Notes 792,970 792,324 671,288 688,856 Total $ 2,181,344 $ 2,179,209 $ 1,915,754 $ 1,953,562 Assets and liabilities measured at fair value on a non-recurring basis The Company’s certain long-lived assets, including identifiable intangible assets, goodwill, right-of-use assets and other long-lived assets, are measured at fair value on a nonrecurring basis when there are indicators of impairment. During the three and nine months ended September 30, 2023, the Company recorded impairment charges of $0.3 million and $19.0 million, respectively, on right-of-use assets and other long-lived assets primarily related to certain office leases that the Company determined will no longer be used. The impairments were derived by comparing the fair value of the impacted assets to the carrying value of those assets as of the impairment measurement date, as required under ASC Topic 360 using Level 3 inputs. See Note 14 — Leases for additional discussion related to these impairment charges.

Contingencies

Contingencies	9 Months Ended
Contingencies	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Legal Matters. The Company is involved in legal proceedings and litigation arising in the ordinary course of business. A provision is recorded for pending litigation in the Company’s consolidated financial statements when it is determined that an unfavorable outcome is probable and the amount of the loss can be reasonably estimated. The Company believes that the potential liability, if any, in excess of amounts already accrued from all proceedings, claims and litigation will not have a material effect on its financial position, cash flows or results of operations when resolved in a future period. Indemnifications. The Company has various agreements that may obligate it to indemnify the other party with respect to certain matters. Generally, these indemnification clauses are included in contracts arising in the normal course of business under which the Company customarily agrees to hold the other party harmless against losses arising from a breach of representations related to matters such as title to assets sold and licensed or certain intellectual property rights. It is not possible to predict the maximum potential amount of future payments under these indemnification agreements due to the conditional nature of the Company’s obligations and the unique facts of each particular agreement. Historically, payments made by the Company under these agreements have not been material. As of September 30, 2023, the Company did not have any material payment obligations under any such indemnification agreements.

Leases

Leases	9 Months Ended
Leases	Sep. 30, 2023
Leases [Abstract]
Leases	LeasesThe Company’s leasing activities are primarily for facilities under cancelable and non-cancelable lease agreements expiring during 2023 and through 2038. These facilities support our executive and administrative activities, sales, systems support, operations, and other functions. The Company also has leases for office equipment and other assets, which are not significant. Certain of these lease agreements include (i) renewal options to extend the lease term for up to ten years and/or (ii) options to terminate the agreement within one year. Additionally, certain of the Company’s lease agreements provide standard recurring escalations of lease payments for, among other things, increases in a lessor’s maintenance costs and taxes. Under some lease agreements, the Company may be entitled to allowances, free rent, lessor-financed tenant improvements and other incentives. The Company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants. The Company subleases certain office space that it does not intend to occupy. Such sublease arrangements expire during 2023 and through 2032 and primarily relate to facilities in Arlington, Virginia. Certain of the Company’s sublease agreements: (i) include renewal and termination options; (ii) provide for customary escalations of lease payments in the normal course of business; and (iii) grant the subtenant certain allowances, free rent, Gartner-financed tenant improvements and other incentives. All of the Company’s leasing and subleasing activity is recognized in Selling, general and administrative expense in the accompanying Condensed Consolidated Statements of Operations. The table below presents the Company’s net lease cost and certain other information related to the Company’s leasing activities as of and for the periods indicated (dollars in thousands). Three Months Ended Nine Months Ended September 30, September 30, Description: 2023 2022 2023 2022 Operating lease cost (1) $ 27,941 $ 29,052 $ 85,307 $ 88,948 Lease cost (2) 6,073 4,148 16,353 11,199 Sublease income (13,906) (11,621) (39,831) (34,358) Total lease cost, net (3) (4) $ 20,108 $ 21,579 $ 61,829 $ 65,789 Cash paid for amounts included in the measurement of operating lease liabilities $ 39,645 $ 34,255 $ 109,787 $ 103,114 Cash receipts from sublease arrangements $ 13,362 $ 11,500 $ 38,580 $ 34,130 Right-of-use assets obtained in exchange for new operating lease liabilities $ 1,476 $ 7,438 $ 9,467 $ 19,120 (1) Included in operating lease cost was $10.9 million and $10.4 million for the three months ended September 30, 2023 and 2022, respectively, and $32.3 million and $31.3 million for the nine months ended September 30, 2023 and 2022, respectively for costs related to subleasing activities. (2) These amounts are primarily variable lease and nonlease costs that are not fixed at the lease commencement date or are dependent on something other than an index or a rate. (3) The Company did not capitalize any operating lease costs during any of the periods presented. (4) Amount excludes impairment charges on lease related assets, as discussed below. The table below indicates where the discounted operating lease payments from the above table are classified in the accompanying Condensed Consolidated Balance Sheets (in thousands). September 30, December 31, Description: 2023 2022 Accounts payable and accrued liabilities $ 98,686 $ 99,717 Operating lease liabilities 531,048 597,267 Total operating lease liabilities included in the Condensed Consolidated Balance Sheets $ 629,734 $ 696,984 As a result and in consideration of the changing nature of the Company’s use of office space, the Company continues to evaluate its existing real estate lease portfolio. In connection with this evaluation, the Company reviewed certain of its right-of-use assets and related other long-lived assets for impairment under ASC 360. As a result of the evaluation, the Company recognized impairment losses during the three months ended September 30, 2023 and 2022 of $0.3 million and $2.0 million, respectively, and $19.0 million and $37.5 million for the nine months ended September 30, 2023 and 2022, respectively, which are included as a component of Selling, general and administrative expenses in the accompanying Condensed Consolidated Statements of Operations. The impairment losses recorded include $0.2 million and $1.7 million related to right-of-use assets and $0.1 million and $0.3 million related to other long-lived assets, primarily leasehold improvements, for the three months ended September 30, 2023 and 2022, respectively. The impairment losses recorded include $13.6 million and $27.0 million related to right-of-use assets and $5.4 million and $10.5 million related to other long-lived assets, primarily leasehold improvements, for the nine months ended September 30, 2023 and 2022, respectively. The fair values for the asset groups relating to the impaired long-lived assets were estimated primarily using discounted cash flow models (income approach) with Level 3 inputs. The significant assumptions used in estimating fair values include the expected downtime prior to the commencement of future subleases, projected sublease income over the remaining lease periods and discount rates that reflect the level of risk associated with receiving future cash flows.
Leases	LeasesThe Company’s leasing activities are primarily for facilities under cancelable and non-cancelable lease agreements expiring during 2023 and through 2038. These facilities support our executive and administrative activities, sales, systems support, operations, and other functions. The Company also has leases for office equipment and other assets, which are not significant. Certain of these lease agreements include (i) renewal options to extend the lease term for up to ten years and/or (ii) options to terminate the agreement within one year. Additionally, certain of the Company’s lease agreements provide standard recurring escalations of lease payments for, among other things, increases in a lessor’s maintenance costs and taxes. Under some lease agreements, the Company may be entitled to allowances, free rent, lessor-financed tenant improvements and other incentives. The Company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants. The Company subleases certain office space that it does not intend to occupy. Such sublease arrangements expire during 2023 and through 2032 and primarily relate to facilities in Arlington, Virginia. Certain of the Company’s sublease agreements: (i) include renewal and termination options; (ii) provide for customary escalations of lease payments in the normal course of business; and (iii) grant the subtenant certain allowances, free rent, Gartner-financed tenant improvements and other incentives. All of the Company’s leasing and subleasing activity is recognized in Selling, general and administrative expense in the accompanying Condensed Consolidated Statements of Operations. The table below presents the Company’s net lease cost and certain other information related to the Company’s leasing activities as of and for the periods indicated (dollars in thousands). Three Months Ended Nine Months Ended September 30, September 30, Description: 2023 2022 2023 2022 Operating lease cost (1) $ 27,941 $ 29,052 $ 85,307 $ 88,948 Lease cost (2) 6,073 4,148 16,353 11,199 Sublease income (13,906) (11,621) (39,831) (34,358) Total lease cost, net (3) (4) $ 20,108 $ 21,579 $ 61,829 $ 65,789 Cash paid for amounts included in the measurement of operating lease liabilities $ 39,645 $ 34,255 $ 109,787 $ 103,114 Cash receipts from sublease arrangements $ 13,362 $ 11,500 $ 38,580 $ 34,130 Right-of-use assets obtained in exchange for new operating lease liabilities $ 1,476 $ 7,438 $ 9,467 $ 19,120 (1) Included in operating lease cost was $10.9 million and $10.4 million for the three months ended September 30, 2023 and 2022, respectively, and $32.3 million and $31.3 million for the nine months ended September 30, 2023 and 2022, respectively for costs related to subleasing activities. (2) These amounts are primarily variable lease and nonlease costs that are not fixed at the lease commencement date or are dependent on something other than an index or a rate. (3) The Company did not capitalize any operating lease costs during any of the periods presented. (4) Amount excludes impairment charges on lease related assets, as discussed below. The table below indicates where the discounted operating lease payments from the above table are classified in the accompanying Condensed Consolidated Balance Sheets (in thousands). September 30, December 31, Description: 2023 2022 Accounts payable and accrued liabilities $ 98,686 $ 99,717 Operating lease liabilities 531,048 597,267 Total operating lease liabilities included in the Condensed Consolidated Balance Sheets $ 629,734 $ 696,984 As a result and in consideration of the changing nature of the Company’s use of office space, the Company continues to evaluate its existing real estate lease portfolio. In connection with this evaluation, the Company reviewed certain of its right-of-use assets and related other long-lived assets for impairment under ASC 360. As a result of the evaluation, the Company recognized impairment losses during the three months ended September 30, 2023 and 2022 of $0.3 million and $2.0 million, respectively, and $19.0 million and $37.5 million for the nine months ended September 30, 2023 and 2022, respectively, which are included as a component of Selling, general and administrative expenses in the accompanying Condensed Consolidated Statements of Operations. The impairment losses recorded include $0.2 million and $1.7 million related to right-of-use assets and $0.1 million and $0.3 million related to other long-lived assets, primarily leasehold improvements, for the three months ended September 30, 2023 and 2022, respectively. The impairment losses recorded include $13.6 million and $27.0 million related to right-of-use assets and $5.4 million and $10.5 million related to other long-lived assets, primarily leasehold improvements, for the nine months ended September 30, 2023 and 2022, respectively. The fair values for the asset groups relating to the impaired long-lived assets were estimated primarily using discounted cash flow models (income approach) with Level 3 inputs. The significant assumptions used in estimating fair values include the expected downtime prior to the commencement of future subleases, projected sublease income over the remaining lease periods and discount rates that reflect the level of risk associated with receiving future cash flows.

Subsequent Event

Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2023
Subsequent Events [Abstract]
Subsequent Event	Subsequent EventOn October 31, 2023, the Company’s Board of Directors authorized incremental share repurchases of up to an additional $500.0 million of Gartner’s common stock. This authorization is in addition to the previously authorized repurchases of up to $4.2 billion, which, as of the end of October 2023, had approximately $500.0 million remaining.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net income	$ 180,009	$ 198,043	$ 295,783	$ 173,545	$ 204,925	$ 172,515	$ 673,835	$ 550,985

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Business and Basis of Present_2

Business and Basis of Presentation (Policies)	9 Months Ended
Business and Basis of Presentation (Policies)	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Segments	Segments . Gartner delivers its products and services globally through three business segments: Research, Conferences and Consulting. Revenues and other financial information for the Company’s segments are discussed in Note 7 — Segment Information.
Basis of presentation	Basis of presentation . The accompanying interim Condensed Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”), as defined in Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 270 for interim financial information and with the applicable instructions of U.S. Securities and Exchange Commission (“SEC”) Rule 10-01 of Regulation S-X on Form 10-Q, and should be read in conjunction with the consolidated financial statements and related notes of the Company in its Annual Report on Form 10-K for the year ended December 31, 2022.
Principles of consolidation	Principles of consolidation . The accompanying interim Condensed Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany transactions and balances have been eliminated.
Use of estimates	Use of estimates . The preparation of the accompanying interim Condensed Consolidated Financial Statements requires management to make estimates and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities, and reported amounts of revenues and expenses. Such estimates include the valuation of fees receivable, goodwill, intangible assets and other long-lived assets, as well as tax accruals and other liabilities. In addition, estimates are used in revenue recognition, income tax expense or benefit, performance-based compensation charges, depreciation and amortization. Management believes its use of estimates in these interim Condensed Consolidated Financial Statements to be reasonable. Management continually evaluates and revises its estimates using historical experience and other factors, including the general economic environment and actions it may take in the future. Management adjusts these estimates when facts and circumstances dictate. However, these estimates may involve significant uncertainties and judgments and cannot be determined with precision. In addition, these estimates are based on management’s best judgment at a point in time. As a result, differences between estimates and actual results could be material and would be reflected in the Company’s consolidated financial statements in future periods.
Cash and cash equivalents and restricted cash	Cash and cash equivalents and restricted cash. Below is a table presenting the beginning-of-period and end-of-period cash amounts from the Company’s Condensed Consolidated Balance Sheets and the total cash amounts presented in the Condensed Consolidated Statements of Cash Flows (in thousands). September 30, December 31, 2023 2022 Cash and cash equivalents $ 1,249,355 $ 697,999 Restricted cash classified in (1): Prepaid expenses and other current assets 600 — Other assets — 600 Cash and cash equivalents and restricted cash $ 1,249,955 $ 698,599 (1) Restricted cash consisted of an escrow account established in connection with one of the Company’s business acquisitions. Generally, such cash is restricted to use due to provisions contained in the underlying acquisition agreement. The Company
Revenue recognition	Revenue recognition. Revenue is recognized in accordance with the requirements of FASB ASC Topic 606, Revenue from Contracts with Customers
Adoption of new accounting standards	Adoption of new accounting standard. The Company adopted the accounting standard described below during the nine months ended September 30, 2023. Reference Rate Reform — In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform—Facilitation of the Effects of Reference Rate Reform on Financial Reporting (“ASU No. 2020-04”). ASU No. 2020-04 provides that an entity can elect not to apply certain required modification accounting in U.S. GAAP to contracts where all changes to the critical terms relate to reference rate reform (e.g., the expected discontinuance of LIBOR and the transition to an alternative reference interest rate, etc.). In addition, the rule provides optional expedients and exceptions that enable entities to continue to apply hedge accounting for hedging relationships where one or more of the critical terms change due to reference rate reform. The rule became effective for all entities as of March 12, 2020 and, after the issuance of ASU 2022-06, will generally no longer be available to apply after December 31, 2024. During 2023, the Company adopted the practical expedient provided under ASU 2020-04 related to its debt and interest rate swap arrangements and as such, the amendments in the second quarter of 2023 are treated as a continuation of the existing agreements and no gain or loss on the modification was recorded.

Business and Basis of Present_3

Business and Basis of Presentation (Tables)	9 Months Ended
Business and Basis of Presentation (Tables)	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Cash and Cash Equivalents	Below is a table presenting the beginning-of-period and end-of-period cash amounts from the Company’s Condensed Consolidated Balance Sheets and the total cash amounts presented in the Condensed Consolidated Statements of Cash Flows (in thousands). September 30, December 31, 2023 2022 Cash and cash equivalents $ 1,249,355 $ 697,999 Restricted cash classified in (1): Prepaid expenses and other current assets 600 — Other assets — 600 Cash and cash equivalents and restricted cash $ 1,249,955 $ 698,599 (1) Restricted cash consisted of an escrow account established in connection with one of the Company’s business acquisitions. Generally, such cash is restricted to use due to provisions contained in the underlying acquisition agreement. The Company
Restrictions on Cash and Cash Equivalents	Below is a table presenting the beginning-of-period and end-of-period cash amounts from the Company’s Condensed Consolidated Balance Sheets and the total cash amounts presented in the Condensed Consolidated Statements of Cash Flows (in thousands). September 30, December 31, 2023 2022 Cash and cash equivalents $ 1,249,355 $ 697,999 Restricted cash classified in (1): Prepaid expenses and other current assets 600 — Other assets — 600 Cash and cash equivalents and restricted cash $ 1,249,955 $ 698,599 (1) Restricted cash consisted of an escrow account established in connection with one of the Company’s business acquisitions. Generally, such cash is restricted to use due to provisions contained in the underlying acquisition agreement. The Company

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
Goodwill and Intangible Assets (Tables)	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of changes to the carrying amount of goodwill by reporting unit	The table below presents changes to the carrying amount of goodwill by segment during the nine months ended September 30, 2023 (in thousands). Research Conferences Consulting Total Balance at December 31, 2022 (1) $ 2,651,193 $ 183,951 $ 95,067 $ 2,930,211 Addition due to an acquisition (2) 4,176 — — 4,176 Foreign currency translation impact (1,267) — 146 (1,121) Balance at September 30, 2023 (1) $ 2,654,102 $ 183,951 $ 95,213 $ 2,933,266 (1) The Company does not have any accumulated goodwill impairment losses. (2) The addition was due to the acquisition of an independent sales agent in September 2023. See Note 2 - Acquisitions and Divestiture for additional information.
Schedule of amortizable intangible assets	The tables below present reconciliations of the carrying amounts of the Company’s finite-lived intangible assets as of the dates indicated (in thousands). September 30, 2023 Customer Technology-related Other Total Gross cost at December 31, 2022 $ 1,060,541 $ 11,200 $ 10,436 $ 1,082,177 Addition due to an acquisition (2) 990 — — 990 Intangible assets fully amortized (987) (39) — (1,026) Foreign currency translation impact 4,970 39 — 5,009 Gross cost 1,065,514 11,200 10,436 1,087,150 Accumulated amortization (1) (553,279) (8,400) (6,356) (568,035) Balance at September 30, 2023 $ 512,235 $ 2,800 $ 4,080 $ 519,115 December 31, 2022 Customer Technology-related Other Total Gross cost $ 1,060,541 11,200 $ 10,436 $ 1,082,177 Accumulated amortization (1) (486,260) (5,600) (5,603) (497,463) Balance at December 31, 2022 $ 574,281 $ 5,600 $ 4,833 $ 584,714 (1) Finite-lived intangible assets are amortized using the straight-line method over the following periods: Customer relationships—6 to 13 years; Technology-related—3 years; and Other—4 to 11 years. (2) The addition was due to the acquisition of an independent sales agent in September 2023. See Note 2 - Acquisitions and Divestiture for additional information.
Schedule of estimated future amortization expense by year	The estimated future amortization expense by year for finite-lived intangible assets is presented in the table below (in thousands). 2023 (remaining three months) $ 22,777 2024 89,240 2025 80,573 2026 77,899 2027 77,290 Thereafter 171,336 $ 519,115

Revenue and Related Matters (Ta

Revenue and Related Matters (Tables)	9 Months Ended
Revenue and Related Matters (Tables)	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue by Reportable Segment	Disaggregated Revenue — The Company’s disaggregated revenue by reportable segment is presented in the tables below for the periods indicated (in thousands). By Primary Geographic Market (1) Three Months Ended September 30, 2023 Primary Geographic Market Research Conferences Consulting Total United States and Canada $ 822,401 $ 7,652 $ 87,409 $ 917,462 Europe, Middle East and Africa 261,813 30,398 29,502 321,713 Other International 134,525 19,150 15,934 169,609 Total revenues $ 1,218,739 $ 57,200 $ 132,845 $ 1,408,784 Three Months Ended September 30, 2022 Primary Geographic Market Research Conferences Consulting Total United States and Canada $ 771,534 $ 44,499 $ 67,194 $ 883,227 Europe, Middle East and Africa 245,093 18,034 26,644 289,771 Other International 131,196 14,498 13,176 158,870 Total revenues $ 1,147,823 $ 77,031 $ 107,014 $ 1,331,868 Nine Months Ended September 30, 2023 Primary Geographic Market Research Conferences Consulting Total United States and Canada $ 2,444,524 $ 179,670 $ 240,797 $ 2,864,991 Europe, Middle East and Africa 788,725 78,408 96,305 963,438 Other International 410,566 32,661 49,182 492,409 Total revenues $ 3,643,815 $ 290,739 $ 386,284 $ 4,320,838 Nine Months Ended September 30, 2022 Primary Geographic Market Research Conferences Consulting Total United States and Canada $ 2,264,733 $ 139,418 $ 208,799 $ 2,612,950 Europe, Middle East and Africa 763,639 40,308 93,135 897,082 Other International 398,160 21,184 41,753 461,097 Total revenues $ 3,426,532 $ 200,910 $ 343,687 $ 3,971,129 (1) Revenue is reported based on where the sale is fulfilled.
Schedule of Disaggregation of Revenue	By Timing of Revenue Recognition Three Months Ended September 30, 2023 Timing of Revenue Recognition Research Conferences Consulting Total Transferred over time (1) $ 1,125,285 $ — $ 99,719 $ 1,225,004 Transferred at a point in time (2) 93,454 57,200 33,126 183,780 Total revenues $ 1,218,739 $ 57,200 $ 132,845 $ 1,408,784 Three Months Ended September 30, 2022 Timing of Revenue Recognition Research Conferences Consulting Total Transferred over time (1) $ 1,045,425 $ — $ 90,316 $ 1,135,741 Transferred at a point in time (2) 102,398 77,031 16,698 196,127 Total revenues $ 1,147,823 $ 77,031 $ 107,014 $ 1,331,868 Nine Months Ended September 30, 2023 Timing of Revenue Recognition Research Conferences Consulting Total Transferred over time (1) $ 3,348,409 $ — $ 300,647 $ 3,649,056 Transferred at a point in time (2) 295,406 290,739 85,637 671,782 Total revenues $ 3,643,815 $ 290,739 $ 386,284 $ 4,320,838 Nine Months Ended September 30, 2022 Timing of Revenue Recognition Research Conferences Consulting Total Transferred over time (1) $ 3,109,099 $ — $ 281,953 $ 3,391,052 Transferred at a point in time (2) 317,433 200,910 61,734 580,077 Total revenues $ 3,426,532 $ 200,910 $ 343,687 $ 3,971,129 (1) Research revenues in this category are recognized in connection with performance obligations that are satisfied over time using a time-elapsed output method to measure progress. Consulting revenues in this category are recognized over time using labor hours as an input measurement. (2) The revenues in this category are recognized in connection with performance obligations that are satisfied at the point in time that the contractual deliverables are provided to the customer.
Schedule for Contract with Customer, Asset and Liability	The table below provides information regarding certain of the Company’s balance sheet accounts that pertain to its contracts with customers (in thousands). September 30, December 31, 2023 2022 Assets: Fees receivable, gross (1) $ 1,148,563 $ 1,565,786 Contract assets recorded in Prepaid expenses and other current assets (2) $ 32,754 $ 21,183 Contract liabilities: Deferred revenues (current liability) (3) $ 2,394,556 $ 2,443,762 Non-current deferred revenues recorded in Other liabilities (3) 26,757 39,115 Total contract liabilities $ 2,421,313 $ 2,482,877 (1) Fees receivable represent an unconditional right to payment from the Company’s customers and include both billed and unbilled amounts. (2) Contract assets represent recognized revenue for which the Company does not have an unconditional right to payment as of the balance sheet date because the project may be subject to a progress billing milestone or some other billing restrictions. (3) Deferred revenues represent amounts (i) for which the Company has received an upfront customer payment or (ii) that pertain to recognized fees receivable. Both situations occur before the completion of the Company’s performance obligation(s).

Computation of Earnings Per S_2

Computation of Earnings Per Share (Tables)	9 Months Ended
Computation of Earnings Per Share (Tables)	Sep. 30, 2023
Earnings Per Share [Abstract]
Schedule Of Basic And Diluted Earnings Per Share Calculations	The table below sets forth the calculation of basic and diluted income per share for the periods indicated (in thousands, except per share data). Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Numerator: Net income used for calculating basic and diluted income per share $ 180,009 $ 173,545 $ 673,835 $ 550,985 Denominator: Weighted average common shares used in the calculation of basic income per share 78,923 79,259 79,220 80,516 Dilutive effect of outstanding awards associated with stock-based compensation plans (1) 597 800 642 857 Shares used in the calculation of diluted income per share 79,520 80,059 79,862 81,373 Basic income per share $ 2.28 $ 2.19 $ 8.51 $ 6.84 Diluted income per share $ 2.26 $ 2.17 $ 8.44 $ 6.77

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
Stock-Based Compensation (Tables)	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Schedule Of Stock-based Compensation Expense By Award Type	The tables below summarize the Company’s stock-based compensation expense by award type and expense category line item during the periods indicated (in millions). Three Months Ended Nine Months Ended September 30, September 30, Award type 2023 2022 2023 2022 Stock appreciation rights $ 2.5 $ 2.2 $ 8.1 $ 6.6 Restricted stock units 24.3 18.6 95.4 70.4 Common stock equivalents 0.3 0.2 0.9 0.6 Total (1) $ 27.1 $ 21.0 $ 104.4 $ 77.6
Schedule Of Stock-Based Compensation Expense By Expense Category	Three Months Ended Nine Months Ended September 30, September 30, Expense category line item 2023 2022 2023 2022 Cost of services and product development $ 11.5 $ 7.6 $ 42.5 $ 27.0 Selling, general and administrative 15.6 13.4 61.9 50.6 Total (1) $ 27.1 $ 21.0 $ 104.4 $ 77.6 (1) Includes costs of $8.5 million and $5.4 million during the three months ended September 30, 2023 and 2022, respectively, and $48.4 million and $32.7 million during the nine months ended September 30, 2023 and 2022, respectively, for awards to retirement-eligible employees. Those awards vest on an accelerated basis.

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
Segment Information (Tables)	Sep. 30, 2023
Segment Reporting [Abstract]
Schedule of Segment Reporting Information by Segment	The tables below present information about the Company’s reportable segments for the periods indicated (in thousands). Three Months Ended September 30, 2023 Research Conferences Consulting Consolidated Revenues $ 1,218,739 $ 57,200 $ 132,845 $ 1,408,784 Gross contribution 894,149 20,449 48,551 963,149 Corporate and other expenses (718,732) Operating income $ 244,417 Three Months Ended September 30, 2022 Research Conferences Consulting Consolidated Revenues $ 1,147,823 $ 77,031 $ 107,014 $ 1,331,868 Gross contribution 848,438 40,318 37,213 925,969 Corporate and other expenses (672,551) Operating income $ 253,418 Nine Months Ended September 30, 2023 Research Conferences Consulting Consolidated Revenues $ 3,643,815 $ 290,739 $ 386,284 $ 4,320,838 Gross contribution 2,678,945 145,687 146,680 2,971,312 Corporate and other expenses (2,035,831) Operating income $ 935,481 Nine Months Ended September 30, 2022 Research Conferences Consulting Consolidated Revenues $ 3,426,532 $ 200,910 $ 343,687 $ 3,971,129 Gross contribution 2,541,782 110,968 138,448 2,791,198 Corporate and other expenses (2,023,411) Operating income $ 767,787
Schedule of Reconciliation of Segment Gross Contribution to Net Income	The table below provides a reconciliation of total segment gross contribution to net income for the periods indicated (in thousands). Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Total segment gross contribution $ 963,149 $ 925,969 $ 2,971,312 $ 2,791,198 Costs and expenses: Cost of services and product development - unallocated (1) 5,206 10,938 23,872 38,474 Selling, general and administrative 660,527 613,031 1,997,785 1,835,846 Depreciation and amortization 48,536 47,251 141,780 143,264 Acquisition and integration charges 4,463 1,331 7,804 5,827 Gain from sale of divested operation — — (135,410) — Operating income 244,417 253,418 935,481 767,787 Interest expense and other, net (19,943) (21,356) (68,683) (44,715) Gain on event cancellation insurance claims — — 3,077 — Less: Provision for income taxes 44,465 58,517 196,040 172,087 Net income $ 180,009 $ 173,545 $ 673,835 $ 550,985 (1) The unallocated amounts consist of certain bonus and fringe costs recorded in consolidated Cost of services and product development that are not allocated to segment expense. The Company’s policy is to allocate bonuses to segments at 100% of a segment employee’s target bonus. Amounts above or below 100% are absorbed by corporate.

Debt (Tables)

Debt (Tables)	9 Months Ended
Debt (Tables)	Sep. 30, 2023
Debt Disclosure [Abstract]
Schedule of Debt	The Company’s total outstanding borrowings are summarized in the table below (in thousands). September 30, December 31, Description 2023 2022 2020 Credit Agreement - Term loan facility (1) $ 276,800 $ 282,200 2020 Credit Agreement - Revolving credit facility (1), (2) — — Senior Notes due 2028 (“2028 Notes”) (3) 800,000 800,000 Senior Notes due 2029 (“2029 Notes”) (4) 600,000 600,000 Senior Notes due 2030 (“2030 Notes”) (5) 800,000 800,000 Other (6) 5,000 5,000 Principal amount outstanding (7) 2,481,800 2,487,200 Less: deferred financing fees (8) (22,287) (25,793) Net balance sheet carrying amount $ 2,459,513 $ 2,461,407 (1) The contractual annualized interest rate as of September 30, 2023 on the amended 2020 Credit Agreement Term loan facility and the Revolving credit facility was 6.725%, which consisted of Term Secured Overnight Financing Rate ("SOFR") of 5.375% plus a margin of 1.350%. However, the Company has an interest rate swap contract that effectively converts the floating SOFR on outstanding amounts to a fixed base rate. (2) The Company had approximately $1.0 billion of available borrowing capacity on the 2020 Credit Agreement revolver (not including the expansion feature) as of September 30, 2023. (3) Consists of $800.0 million principal amount of 2028 Notes outstanding. The 2028 Notes bear interest at a fixed rate of 4.50% and mature on July 1, 2028. (4) Consists of $600.0 million principal amount of 2029 Notes outstanding. The 2029 Notes bear interest at a fixed rate of 3.625% and mature on June 15, 2029. (5) Consists of $800.0 million principal amount of 2030 Notes outstanding. The 2030 Notes bear interest at a fixed rate of 3.75% and mature on October 1, 2030. (6) Consists of a State of Connecticut economic development loan originated in 2019 with a 10-year maturity and bears interest at a fixed rate of 1.75%. This loan may be repaid at any time by the Company without penalty. (7) The weighted average annual effective rate on the Company’s outstanding debt for the three and nine months ended September 30, 2023, including the effects of its interest rate swaps discussed below, was 4.98% and 5.01%, respectively. (8) Deferred financing fees are being amortized to Interest expense, net over the term of the related debt obligation.

Equity (Tables)

Equity (Tables)	9 Months Ended
Equity (Tables)	Sep. 30, 2023
Stockholders' Equity Note [Abstract]
Schedule Of Share Repurchase Activity	The Company’s share repurchase activity is presented in the table below for the periods indicated. Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Number of shares repurchased (1) 648,616 375,076 1,400,129 3,783,922 Cash paid for repurchased shares (in thousands) (2) $ 209,367 $ 96,534 $ 447,739 $ 1,026,414 (1) The average purchase price for repurchased shares was $341.11 and $254.71 for the three months ended September 30, 2023 and 2022, respectively, and $330.50 and $272.84 for the nine months ended September 30, 2023 and 2022, respectively. The repurchased shares during the three and nine months ended September 30, 2023 and 2022 included purchases for both open market purchases and stock-based compensation award settlements. (2) The cash paid for repurchased shares during the nine months ended September 30, 2023 excluded $15.0 million of open market purchases with trade dates in September 2023 that settled in October 2023 and $2.8 million of excise tax accrued. The cash paid for repurchased shares during the nine months ended September 30, 2022 excluded $6.0 million of open market purchases with trade dates in September 2022 that settled in October 2022. The cash paid for repurchased shares during the three months ended September 30, 2023 included $3.1 million of open market purchases with trade dates in June
Schedule Of The Changes In Accumulated Other Comprehensive Loss By Component (Net Of Tax)	The tables below provide information about the changes in AOCL by component and the related amounts reclassified out of AOCL to income during the periods indicated (net of tax, in thousands) (1). Three Months Ended September 30, 2023 Interest Rate Defined Foreign Total Balance – June 30, 2023 $ (31,596) $ (4,180) $ (49,351) $ (85,127) Other comprehensive income (loss) activity during the period: Change in AOCL before reclassifications to income — — (13,171) (13,171) Reclassifications from AOCL to income (2), (3) 3,707 33 — 3,740 Other comprehensive income (loss), net 3,707 33 (13,171) (9,431) Balance – September 30, 2023 $ (27,889) $ (4,147) $ (62,522) $ (94,558) Three Months Ended September 30, 2022 Interest Rate Defined Foreign Total Balance – June 30, 2022 $ (47,084) $ (6,767) $ (50,665) $ (104,516) Other comprehensive income (loss) activity during the period: Change in AOCL before reclassifications to income — — (29,961) (29,961) Reclassifications from AOCL to income (2), (3) 3,886 43 — 3,929 Other comprehensive income (loss), net 3,886 43 (29,961) (26,032) Balance – September 30, 2022 $ (43,198) $ (6,724) $ (80,626) $ (130,548) Nine Months Ended September 30, 2023 Interest Rate Defined Foreign Total Balance – December 31, 2022 $ (39,248) $ (4,247) $ (58,115) $ (101,610) Other comprehensive income (loss) activity during the period: Change in AOCL before reclassifications to income — — (4,407) (4,407) Reclassifications from AOCL to income (2), (3) 11,359 100 — 11,459 Other comprehensive income (loss), net 11,359 100 (4,407) 7,052 Balance – September 30, 2023 $ (27,889) $ (4,147) $ (62,522) $ (94,558) Nine Months Ended September 30, 2022 Interest Rate Defined Foreign Total Balance – December 31, 2021 $ (56,323) $ (6,672) $ (18,436) $ (81,431) Other comprehensive income (loss) activity during the period: Change in AOCL before reclassifications to income — (189) (62,190) (62,379) Reclassifications from AOCL to income (2), (3) 13,125 137 — 13,262 Other comprehensive income (loss), net 13,125 (52) (62,190) (49,117) Balance – September 30, 2022 $ (43,198) $ (6,724) $ (80,626) $ (130,548) (1) Amounts in parentheses represent debits (deferred losses). (2) $4.9 million and $5.2 million of the reclassifications related to interest rate swaps (cash flow hedges) were recorded in Interest expense, net, for the three months ended September 30, 2023 and 2022, respectively. $15.2 million and $17.5 million of the reclassifications related to interest rate swaps (cash flow hedges) were recorded in Interest expense, net, for the nine months ended September 30, 2023 and 2022, respectively. See Note 8 — Debt and Note 11 — Derivatives and Hedging for information regarding the cash flow hedges.

Derivatives and Hedging (Tables

Derivatives and Hedging (Tables)	9 Months Ended
Derivatives and Hedging (Tables)	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Amounts of Outstanding Derivative Positions	The tables below provide information regarding the Company’s outstanding derivative contracts as of the dates indicated (in thousands, except for number of contracts). September 30, 2023 Derivative Contract Type Number of Notional Fair Value Balance Unrealized Interest rate swaps (1) 1 $ 350,000 $ 4,746 Other assets $ (27,889) 8,117 Other current assets Foreign currency forwards (2) 32 168,810 (185) Accrued liabilities — Total 33 $ 518,810 $ 12,678 $ (27,889) December 31, 2022 Derivative Contract Type Number of Contracts Notional Fair Value Balance Unrealized Interest rate swaps (1) 1 $ 350,000 $ 3,952 Other assets $ (39,248) 6,346 Other current assets Foreign currency forwards (2) 138 687,763 625 Other current assets — Total 139 $ 1,037,763 $ 10,923 $ (39,248) (1) Effective June 30, 2020, the Company de-designated all of its interest rate swaps and discontinued hedge accounting. Accordingly, subsequent changes to fair value of the interest rate swaps are recorded in Other income, net. The amounts previously recorded in Accumulated other comprehensive loss are amortized into Interest expense, net over the terms of the hedged forecasted interest payments. See Note 8 — Debt for additional information regarding the Company’s interest rate swap contracts. (2) The Company has foreign exchange transaction risk because it typically enters into transactions in the normal course of business that are denominated in foreign currencies that differ from the local functional currency. The Company enters into short-term foreign currency forward exchange contracts to mitigate the cash flow risk associated with changes in foreign currency rates on forecasted foreign currency transactions. These contracts are accounted for at fair value with realized and unrealized gains and losses recognized in Other income, net because the Company does not designate these contracts as hedges for accounting purposes. All of the outstanding foreign currency forward exchange contracts at September 30, 2023 matured before October 31, 2023. (3) See Note 12 — Fair Value Disclosures for the determination of the fair values of these instruments.
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	The table below provides information regarding amounts recognized in the accompanying Condensed Consolidated Statements of Operations for derivative contracts for the periods indicated (in thousands). Three Months Ended Nine Months Ended September 30, September 30, Amount recorded in: 2023 2022 2023 2022 Interest expense, net (1) $ 4,948 $ 5,185 $ 15,159 $ 17,515 Other (income) expense, net (2,567) 1,295 (8,367) (17,456) Total (income) expense, net $ 2,381 $ 6,480 $ 6,792 $ 59 (1) Consists of interest expense from interest rate swap contracts.

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	9 Months Ended
Fair Value Disclosures (Tables)	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured to Fair Value on Recurring Basis	The table below presents the fair values of certain financial assets and liabilities that are measured at fair value on a recurring basis in the Company's financial statements (in thousands). Description September 30, December 31, Assets: Values based on Level 1 inputs: Deferred compensation plan assets (1) $ 12,683 $ 6,065 Total Level 1 inputs 12,683 6,065 Values based on Level 2 inputs: Deferred compensation plan assets (1) 91,224 84,318 Foreign currency forward contracts (2) 193 3,236 Interest rate swap contract (3) 12,863 10,298 Total Level 2 inputs 104,280 97,852 Total Assets $ 116,963 $ 103,917 Liabilities: Values based on Level 2 inputs: Deferred compensation plan liabilities (1) $ 109,778 $ 96,641 Foreign currency forward contracts (2) 378 2,611 Total Level 2 inputs 110,156 99,252 Total Liabilities $ 110,156 $ 99,252 (1) The Company has a deferred compensation plan for the benefit of certain highly compensated officers, managers and other key employees. The assets consist of investments in money market funds, mutual funds and company-owned life insurance contracts, which are valued based on Level 1 or Level 2 inputs. The related deferred compensation plan liabilities are recorded at fair value, or the estimated amount needed to settle the liability, which the Company considers to be a Level 2 input. (2) The Company enters into foreign currency forward exchange contracts to hedge the effects of adverse fluctuations in foreign currency exchange rates (see Note 11 — Derivatives and Hedging). Valuation of these contracts is based on observable foreign currency exchange rates in active markets, which the Company considers to be a Level 2 input. (3) The Company has an interest rate swap contract that hedges the risk of variability from interest payments on its borrowings (see Note 8 — Debt). The fair value of the interest rate swap is based on mark-to-market valuations prepared by a third-party broker. This valuation is based on observable interest rates from recently executed market transactions and other observable market data, which the Company considers to be Level 2 inputs. The Company independently corroborates the reasonableness of the valuations prepared by the third-party broker by using an electronic quotation service.
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	The table below presents the carrying amounts (net of deferred financing costs) and fair values of financial instruments that are not recorded at fair value in the Company’s Condensed Consolidated Balance Sheets (in thousands). The estimated fair value of the financial instruments was derived from quoted market prices provided by an independent dealer, which the Company considers to be a Level 2 input. Carrying Amount Fair Value September 30, December 31, September 30, December 31, Description 2023 2022 2023 2022 2028 Notes $ 793,794 $ 792,934 $ 729,888 $ 740,864 2029 Notes 594,580 593,951 514,578 523,842 2030 Notes 792,970 792,324 671,288 688,856 Total $ 2,181,344 $ 2,179,209 $ 1,915,754 $ 1,953,562

Leases (Tables)

Leases (Tables)	9 Months Ended
Leases (Tables)	Sep. 30, 2023
Leases [Abstract]
Lease Costs	The table below presents the Company’s net lease cost and certain other information related to the Company’s leasing activities as of and for the periods indicated (dollars in thousands). Three Months Ended Nine Months Ended September 30, September 30, Description: 2023 2022 2023 2022 Operating lease cost (1) $ 27,941 $ 29,052 $ 85,307 $ 88,948 Lease cost (2) 6,073 4,148 16,353 11,199 Sublease income (13,906) (11,621) (39,831) (34,358) Total lease cost, net (3) (4) $ 20,108 $ 21,579 $ 61,829 $ 65,789 Cash paid for amounts included in the measurement of operating lease liabilities $ 39,645 $ 34,255 $ 109,787 $ 103,114 Cash receipts from sublease arrangements $ 13,362 $ 11,500 $ 38,580 $ 34,130 Right-of-use assets obtained in exchange for new operating lease liabilities $ 1,476 $ 7,438 $ 9,467 $ 19,120 (1) Included in operating lease cost was $10.9 million and $10.4 million for the three months ended September 30, 2023 and 2022, respectively, and $32.3 million and $31.3 million for the nine months ended September 30, 2023 and 2022, respectively for costs related to subleasing activities. (2) These amounts are primarily variable lease and nonlease costs that are not fixed at the lease commencement date or are dependent on something other than an index or a rate. (3) The Company did not capitalize any operating lease costs during any of the periods presented. (4) Amount excludes impairment charges on lease related assets, as discussed below.
Supplemental Balance Sheet Information	The table below indicates where the discounted operating lease payments from the above table are classified in the accompanying Condensed Consolidated Balance Sheets (in thousands). September 30, December 31, Description: 2023 2022 Accounts payable and accrued liabilities $ 98,686 $ 99,717 Operating lease liabilities 531,048 597,267 Total operating lease liabilities included in the Condensed Consolidated Balance Sheets $ 629,734 $ 696,984

Business and Basis of Present_4

Business and Basis of Presentation - Narrative (Details) $ in Millions	1 Months Ended	9 Months Ended
	Feb. 28, 2023 USD ($)	Sep. 30, 2023 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments \| segment		3
Proceeds from event cancellation insurance claims \| $	$ 3.1

Business and Basis of Present_5

Business and Basis of Presentation - Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 1,249,355	$ 697,999
Prepaid expenses and other current assets	600	0
Other assets	0	600
Cash and cash equivalents and restricted cash	$ 1,249,955	$ 698,599	$ 528,687	$ 760,602

Acquisitions and Divestiture (D

Acquisitions and Divestiture (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Feb. 28, 2023
Business Acquisition [Line Items]
Proceeds from sale of divested operation					$ 156,057	$ 0
Gain from sale of divested operation			$ 0	$ 0	135,410	$ 0
TalentNeuron
Business Acquisition [Line Items]
Gain from sale of divested operation					135,400
TalentNeuron
Business Acquisition [Line Items]
Sale of business, consideration							$ 161,100
Proceeds from sale of divested operation					156,100
Goodwill	$ 16,000		16,000		16,000
Intangible assets, net	9,500		9,500		9,500
Property, equipment and leasehold improvements, net,	4,500		4,500		4,500
Accounts receivable	11,800		11,800		11,800
Deferred revenues	$ 24,400		$ 24,400		$ 24,400
Gartner Research Products
Business Acquisition [Line Items]
Percent of outstanding membership interests acquired	100%		100%		100%
Purchase price	$ 7,900
UpCity, Inc.
Business Acquisition [Line Items]
Percent of outstanding membership interests acquired		100%
Purchase price		$ 6,400

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Changes to the Carrying Amount of Goodwill by Segment (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)
Goodwill [Line Items]
Goodwill impairment	$ 0
Goodwill [Roll Forward]
Beginning balance		$ 2,930,211,000
Additions due to an acquisition		4,176,000
Foreign currency translation impact		(1,121,000)
Ending balance	2,933,266,000	2,933,266,000
Goodwill, accumulated impairment losses	0	0
Research
Goodwill [Roll Forward]
Beginning balance		2,651,193,000
Additions due to an acquisition		4,176,000
Foreign currency translation impact		(1,267,000)
Ending balance	2,654,102,000	2,654,102,000
Conferences
Goodwill [Roll Forward]
Beginning balance		183,951,000
Additions due to an acquisition		0
Foreign currency translation impact		0
Ending balance	183,951,000	183,951,000
Consulting
Goodwill [Roll Forward]
Beginning balance		95,067,000
Additions due to an acquisition		0
Foreign currency translation impact		146,000
Ending balance	$ 95,213,000	$ 95,213,000

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Carrying Amounts of Amortizable Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Finite-lived Intangible Assets [Roll Forward]
Gross cost, beginning balance			$ 1,082,177
Addition due to an acquisition			990
Intangible assets fully amortized			(1,026)
Foreign currency translation impact			5,009
Gross cost, ending balance	$ 1,087,150		1,087,150
Accumulated amortization	(568,035)		(568,035)		$ (497,463)
Finite-lived intangible assets, net	519,115		519,115		584,714
Amortization of intangibles	23,989	$ 24,369	69,625	$ 74,271
Customer Relationships
Finite-lived Intangible Assets [Roll Forward]
Gross cost, beginning balance			1,060,541
Addition due to an acquisition			990
Intangible assets fully amortized			(987)
Foreign currency translation impact			4,970
Gross cost, ending balance	1,065,514		1,065,514
Accumulated amortization	(553,279)		(553,279)		(486,260)
Finite-lived intangible assets, net	$ 512,235		$ 512,235		574,281
Customer Relationships \| Minimum
Finite-lived Intangible Assets [Roll Forward]
Remaining amortization period	6 years		6 years
Customer Relationships \| Maximum
Finite-lived Intangible Assets [Roll Forward]
Remaining amortization period	13 years		13 years
Technology-related
Finite-lived Intangible Assets [Roll Forward]
Gross cost, beginning balance			$ 11,200
Addition due to an acquisition			0
Intangible assets fully amortized			(39)
Foreign currency translation impact			39
Gross cost, ending balance	$ 11,200		11,200
Accumulated amortization	(8,400)		(8,400)		(5,600)
Finite-lived intangible assets, net	$ 2,800		$ 2,800		5,600
Remaining amortization period	3 years		3 years
Other
Finite-lived Intangible Assets [Roll Forward]
Gross cost, beginning balance			$ 10,436
Addition due to an acquisition			0
Intangible assets fully amortized			0
Foreign currency translation impact			0
Gross cost, ending balance	$ 10,436		10,436
Accumulated amortization	(6,356)		(6,356)		(5,603)
Finite-lived intangible assets, net	$ 4,080		$ 4,080		$ 4,833
Other \| Minimum
Finite-lived Intangible Assets [Roll Forward]
Remaining amortization period	4 years		4 years
Other \| Maximum
Finite-lived Intangible Assets [Roll Forward]
Remaining amortization period	11 years		11 years

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Estimated Future Amortization Expense By Year From Amortizable Intangibles (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2023 (remaining three months)	$ 22,777
2024	89,240
2025	80,573
2026	77,899
2027	77,290
Thereafter	171,336
Finite-lived intangible assets, net	$ 519,115	$ 584,714

Revenue and Related Matters - D

Revenue and Related Matters - Disaggregation of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,408,784	$ 1,331,868	$ 4,320,838	$ 3,971,129
United States and Canada
Disaggregation of Revenue [Line Items]
Total revenues	917,462	883,227	2,864,991	2,612,950
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	321,713	289,771	963,438	897,082
Other International
Disaggregation of Revenue [Line Items]
Total revenues	169,609	158,870	492,409	461,097
Research
Disaggregation of Revenue [Line Items]
Total revenues	1,218,739	1,147,823	3,643,815	3,426,532
Research \| United States and Canada
Disaggregation of Revenue [Line Items]
Total revenues	822,401	771,534	2,444,524	2,264,733
Research \| Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	261,813	245,093	788,725	763,639
Research \| Other International
Disaggregation of Revenue [Line Items]
Total revenues	134,525	131,196	410,566	398,160
Conferences
Disaggregation of Revenue [Line Items]
Total revenues	57,200	77,031	290,739	200,910
Conferences \| United States and Canada
Disaggregation of Revenue [Line Items]
Total revenues	7,652	44,499	179,670	139,418
Conferences \| Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	30,398	18,034	78,408	40,308
Conferences \| Other International
Disaggregation of Revenue [Line Items]
Total revenues	19,150	14,498	32,661	21,184
Consulting
Disaggregation of Revenue [Line Items]
Total revenues	132,845	107,014	386,284	343,687
Consulting \| United States and Canada
Disaggregation of Revenue [Line Items]
Total revenues	87,409	67,194	240,797	208,799
Consulting \| Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	29,502	26,644	96,305	93,135
Consulting \| Other International
Disaggregation of Revenue [Line Items]
Total revenues	$ 15,934	$ 13,176	$ 49,182	$ 41,753

Revenue and Related Matters - T

Revenue and Related Matters - Timing Of Revenue Recognition Liabilities per Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,408,784	$ 1,331,868	$ 4,320,838	$ 3,971,129
Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	1,225,004	1,135,741	3,649,056	3,391,052
Transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenues	183,780	196,127	671,782	580,077
Research
Disaggregation of Revenue [Line Items]
Total revenues	1,218,739	1,147,823	3,643,815	3,426,532
Research \| Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	1,125,285	1,045,425	3,348,409	3,109,099
Research \| Transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenues	93,454	102,398	295,406	317,433
Conferences
Disaggregation of Revenue [Line Items]
Total revenues	57,200	77,031	290,739	200,910
Conferences \| Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Conferences \| Transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenues	57,200	77,031	290,739	200,910
Consulting
Disaggregation of Revenue [Line Items]
Total revenues	132,845	107,014	386,284	343,687
Consulting \| Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	99,719	90,316	300,647	281,953
Consulting \| Transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenues	$ 33,126	$ 16,698	$ 85,637	$ 61,734

Revenue and Related Matters - R

Revenue and Related Matters - Revenue Remaining Performance Obligation (Details) $ in Billions	Sep. 30, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 5.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 0.9
Revenue, remaining performance obligation, expected timing of satisfaction, period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 2.7
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 1.5
Revenue, remaining performance obligation, expected timing of satisfaction, period

Revenue and Related Matters - S

Revenue and Related Matters - Schedule of Contract with Customer, Asset and Liability (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Assets:
Fees receivable, gross	$ 1,148,563		$ 1,148,563		$ 1,565,786
Contract assets recorded in Prepaid expenses and other current assets	32,754		32,754		21,183
Contract liabilities:
Deferred revenues (current liability)	2,394,556		2,394,556		2,443,762
Non-current deferred revenues recorded in Other liabilities	26,757		26,757		39,115
Total contract liabilities	2,421,313		2,421,313		$ 2,482,877
Revenue recognized previously attributable to deferred revenues	$ 1,000,000	$ 900,000	$ 1,900,000	$ 1,800,000

Computation of Earnings Per S_3

Computation of Earnings Per Share - Calculations Of Basic And Diluted (Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net income used for calculating basic and diluted income per share	$ 180,009	$ 198,043	$ 295,783	$ 173,545	$ 204,925	$ 172,515	$ 673,835	$ 550,985
Denominator:
Weighted average number of common shares used in the calculation of basic income per share (in shares)	78,923			79,259			79,220	80,516
Dilutive effect of outstanding awards associated with stock-based compensation plans (in shares)	597			800			642	857
Shares used in the calculation of diluted income per share (in shares)	79,520			80,059			79,862	81,373
Basic income per share (in dollars per share)	$ 2.28			$ 2.19			$ 8.51	$ 6.84
Diluted income per share (in dollars per share)	$ 2.26			$ 2.17			$ 8.44	$ 6.77

Computation of Earnings Per S_4

Computation of Earnings Per Share - Additional information (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of (loss) income per share (in shares)	0.1	0.1	0.1	0.1

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - $ / shares shares in Millions	Sep. 30, 2023	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Number of shares available for grant (in shares)	6
Common stock par value (in dollars per share)	$ 0.0005	$ 0.0005

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock-based Compensation Expense by Award Type and Expense Category (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 27.1	$ 21	$ 104.4	$ 77.6
Cost of services and product development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	11.5	7.6	42.5	27
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	15.6	13.4	61.9	50.6
Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2.5	2.2	8.1	6.6
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	24.3	18.6	95.4	70.4
Common stock equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	0.3	0.2	0.9	0.6
Retirement Eligible Employees Equity Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 8.5	$ 5.4	$ 48.4	$ 32.7

Segment Information - Informati

Segment Information - Information About Reportable Segments (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment			3
Operating income	$ 244,417,000	$ 253,418,000	$ 935,481,000	$ 767,787,000
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues			0
Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,408,784,000	1,331,868,000	4,320,838,000	3,971,129,000
Operating income	963,149,000	925,969,000	2,971,312,000	2,791,198,000
Operating Segments \| Research
Segment Reporting Information [Line Items]
Revenues	1,218,739,000	1,147,823,000	3,643,815,000	3,426,532,000
Operating income	894,149,000	848,438,000	2,678,945,000	2,541,782,000
Operating Segments \| Conferences
Segment Reporting Information [Line Items]
Revenues	57,200,000	77,031,000	290,739,000	200,910,000
Operating income	20,449,000	40,318,000	145,687,000	110,968,000
Operating Segments \| Consulting
Segment Reporting Information [Line Items]
Revenues	132,845,000	107,014,000	386,284,000	343,687,000
Operating income	48,551,000	37,213,000	146,680,000	138,448,000
Corporate and Reconciling Items
Segment Reporting Information [Line Items]
Operating income	$ (718,732,000)	$ (672,551,000)	$ (2,035,831,000)	$ (2,023,411,000)

Segment Information - Reconcili

Segment Information - Reconciliation of Segment Gross Contribution to Net Income (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment gross contribution	$ 244,417			$ 253,418			$ 935,481	$ 767,787
Costs and expenses:
Cost of services and product development - unallocated	450,841			416,837			1,373,398	1,218,405
Selling, general and administrative	660,527			613,031			1,997,785	1,835,846
Acquisition and integration charges	4,463			1,331			7,804	5,827
Gain from sale of divested operation	0			0			(135,410)	0
Operating income	244,417			253,418			935,481	767,787
Interest expense and other, net	(19,943)			(21,356)			(68,683)	(44,715)
Gain on event cancellation insurance claims	0			0			3,077	0
Less: Provision for income taxes	44,465			58,517			196,040	172,087
Net income	180,009	$ 198,043	$ 295,783	173,545	$ 204,925	$ 172,515	$ 673,835	550,985
Maximum
Costs and expenses:
Percent of target bonus charges allocated to segments							100%
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment gross contribution	963,149			925,969			$ 2,971,312	2,791,198
Costs and expenses:
Operating income	963,149			925,969			2,971,312	2,791,198
Corporate and Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment gross contribution	(718,732)			(672,551)			(2,035,831)	(2,023,411)
Costs and expenses:
Cost of services and product development - unallocated	5,206			10,938			23,872	38,474
Selling, general and administrative	660,527			613,031			1,997,785	1,835,846
Depreciation and amortization	48,536			47,251			141,780	143,264
Acquisition and integration charges	4,463			1,331			7,804	5,827
Operating income	$ (718,732)			$ (672,551)			$ (2,035,831)	$ (2,023,411)

Debt - Borrowings (Details)

Debt - Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Principal amount outstanding	$ 2,481,800	$ 2,487,200
Less: deferred financing fees	(22,287)	(25,793)
Net balance sheet carrying amount	2,459,513	2,461,407
Term Loan Facility \| 2020 Credit Agreement
Debt Instrument [Line Items]
Principal amount outstanding	276,800	282,200
Line of Credit \| Revolving credit facility \| 2020 Credit Agreement
Debt Instrument [Line Items]
Principal amount outstanding	0	0
Senior Notes \| 2028 Notes
Debt Instrument [Line Items]
Principal amount outstanding	800,000	800,000
Senior Notes \| 2029 Notes
Debt Instrument [Line Items]
Principal amount outstanding	600,000	600,000
Senior Notes \| 2030 Notes
Debt Instrument [Line Items]
Principal amount outstanding	800,000	800,000
Other
Debt Instrument [Line Items]
Principal amount outstanding	$ 5,000	$ 5,000

Debt - Footnote to Borrowings (

Debt - Footnote to Borrowings (Details) - USD ($)	3 Months Ended	9 Months Ended
Debt - Footnote to Borrowings (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2023	Jun. 18, 2021	Sep. 28, 2020	Jun. 22, 2020
Debt Instrument [Line Items]
Weighted average effective rate	4.98%	5.01%
Term Loan Facility \| 2020 Credit Agreement
Debt Instrument [Line Items]
Contractual annualized interest rate	6.725%	6.725%
Floating eurodollar base rate	5.375%	5.375%
Additional interest above base rate		1.35%
Aggregate principal amount				$ 400,000,000
Line of Credit \| Revolving credit facility \| 2020 Credit Agreement
Debt Instrument [Line Items]
Remaining borrowing capacity	$ 1,000,000,000	$ 1,000,000,000
Senior Notes \| 2028 Notes
Debt Instrument [Line Items]
Aggregate principal amount	800,000,000	800,000,000			$ 800,000,000
Debt instrument, fixed interest rate					4.50%
Senior Notes \| 2029 Notes
Debt Instrument [Line Items]
Aggregate principal amount	600,000,000	600,000,000	$ 600,000,000
Debt instrument, fixed interest rate			3.625%
Senior Notes \| 2030 Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 800,000,000	$ 800,000,000		$ 800,000,000
Debt instrument, fixed interest rate				3.75%
Connecticut Economic Development Program \| Economic Development Loan 2
Debt Instrument [Line Items]
Debt instrument, fixed interest rate	1.75%	1.75%
Debt term		10 years

Debt - Narrative (Details)

Debt - Narrative (Details) - USD ($)				1 Months Ended
Debt - Narrative (Details) - USD ($)	Jun. 18, 2021	Sep. 28, 2020	Jun. 22, 2020	May 31, 2023	Sep. 30, 2023
2029 Notes \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 600,000,000				$ 600,000,000
Debt instrument, fixed interest rate	3.625%
Debt instrument, issue price, percent	100%
2029 Notes \| Senior Notes \| Debt Instrument Redemption Option One
Debt Instrument [Line Items]
Percentage of principal amount redeemed	40%
2030 Notes \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount		$ 800,000,000			800,000,000
Debt instrument, fixed interest rate		3.75%
Debt instrument, issue price, percent		100%
Percentage of principal amount redeemed		40%
2028 Notes \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount			$ 800,000,000		$ 800,000,000
Debt instrument, fixed interest rate			4.50%
Debt instrument, issue price, percent			100%
Percentage of principal amount redeemed			40%
2020 Credit Agreement \| Term Loan Facility
Debt Instrument [Line Items]
Aggregate principal amount		$ 400,000,000
2020 Credit Agreement \| Line of Credit \| Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 1,000,000,000
2020 Credit Agreement \| Line of Credit \| Revolving credit facility \| SOFR
Debt Instrument [Line Items]
Basis spread on variable rate				0.10%

Debt - Interest Rate Swaps (Det

Debt - Interest Rate Swaps (Details) $ in Thousands	1 Months Ended	9 Months Ended
Debt - Interest Rate Swaps (Details) $ in Thousands	May 31, 2023	Sep. 30, 2023 USD ($) contract	Dec. 31, 2022 USD ($) contract
Derivative [Line Items]
Number of contracts \| contract		33	139
Interest rate swap contracts total notional value		$ 518,810	$ 1,037,763
Interest rate swaps
Derivative [Line Items]
Term of contract	30 days	30 days
Loss on release of interest rate swap recognized in AOCI		$ 37,200
Interest rate swaps \| Minimum
Derivative [Line Items]
Fixed interest rate	2.98%	3.04%
Interest rate swaps \| Debt Instrument, Redemption, Period One
Derivative [Line Items]
Number of contracts \| contract		1
Interest rate swap contracts total notional value		$ 350,000

Equity - Share Repurchase Progr

Equity - Share Repurchase Program and Share Repurchase Activity (Details) - USD ($)	1 Months Ended					3 Months Ended		9 Months Ended
	Oct. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Feb. 28, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2015
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount													$ 1,200,000,000
Stock repurchase program, additional authorized amount										$ 400,000,000	$ 1,000,000,000	$ 1,600,000,000
Stock repurchase program, remaining authorized repurchase amount		$ 610,800,000				$ 610,800,000		$ 610,800,000
Number of shares repurchased (in shares)						648,616	375,076	1,400,129	3,783,922
Cash paid for repurchased shares						$ 209,367,000	$ 96,534,000	$ 447,739,000	$ 1,026,414,000
Treasury stock, average price paid per share (in dollars per share)						$ 341.11	$ 254.71	$ 330.50	$ 272.84
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 4,200,000,000
Stock repurchase program, additional authorized amount	500,000,000
Stock repurchase program, remaining authorized repurchase amount	500,000,000
Open Market Purchases, Excluded
Equity, Class of Treasury Stock [Line Items]
Cash paid for repurchased shares		$ 15,000,000		$ 6,000,000
Accrued Excise Tax \| Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Cash paid for repurchased shares	$ 2,800,000
Open Market Purchases
Equity, Class of Treasury Stock [Line Items]
Cash paid for repurchased shares			$ 3,100,000		$ 7,000,000

Equity - Changes in AOCI_L by C

Equity - Changes in AOCI/L by Component (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 586,506	$ 472,858	$ 227,798	$ (142,867)	$ 118,153	$ 371,058	$ 227,798	$ 371,058
Change in AOCL before reclassifications to income	(13,171)			(29,961)			(4,407)	(62,379)
Reclassifications from AOCL to income	3,740			3,929			11,459	13,262
Other comprehensive income (loss), net of tax	(9,431)	10,783	5,700	(26,032)	(21,705)	(1,380)	7,052	(49,117)
Ending balance	566,638	586,506	472,858	(64,926)	(142,867)	118,153	566,638	(64,926)
Derivative reclassifications	(2,381)			(6,480)			(6,792)	(59)
Interest rate swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Derivative reclassifications	4,900			5,200			15,200	17,500
Loss to be reclassified within twelve months							19,300
Interest Rate Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(31,596)		(39,248)	(47,084)		(56,323)	(39,248)	(56,323)
Change in AOCL before reclassifications to income	0			0			0	0
Reclassifications from AOCL to income	3,707			3,886			11,359	13,125
Other comprehensive income (loss), net of tax	3,707			3,886			11,359	13,125
Ending balance	(27,889)	(31,596)		(43,198)	(47,084)		(27,889)	(43,198)
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(4,180)		(4,247)	(6,767)		(6,672)	(4,247)	(6,672)
Change in AOCL before reclassifications to income	0			0			0	(189)
Reclassifications from AOCL to income	33			43			100	137
Other comprehensive income (loss), net of tax	33			43			100	(52)
Ending balance	(4,147)	(4,180)		(6,724)	(6,767)		(4,147)	(6,724)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(49,351)		(58,115)	(50,665)		(18,436)	(58,115)	(18,436)
Change in AOCL before reclassifications to income	(13,171)			(29,961)			(4,407)	(62,190)
Reclassifications from AOCL to income	0			0			0	0
Other comprehensive income (loss), net of tax	(13,171)			(29,961)			(4,407)	(62,190)
Ending balance	(62,522)	(49,351)		(80,626)	(50,665)		(62,522)	(80,626)
Accumulated Other Comprehensive Loss, Net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(85,127)	(95,910)	(101,610)	(104,516)	(82,811)	(81,431)	(101,610)	(81,431)
Other comprehensive income (loss), net of tax	(9,431)	10,783	5,700	(26,032)	(21,705)	(1,380)
Ending balance	$ (94,558)	$ (85,127)	$ (95,910)	$ (130,548)	$ (104,516)	$ (82,811)	$ (94,558)	$ (130,548)

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 44,465	$ 58,517	$ 196,040	$ 172,087
Effective income tax rate	19.80%	25.20%	22.50%	23.80%
Unrecognized tax benefits	$ 140,100		$ 140,100		$ 137,200
Unrecognized tax benefits reductions resulting from anticipated closure of audits and the expiration of certain statutes of limitation			$ 5,300

Derivatives and Hedging - Outst

Derivatives and Hedging - Outstanding Derivatives Contracts (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) contract	Dec. 31, 2022 USD ($) contract
Derivatives, Fair Value [Line Items]
Number of Contracts \| contract	33	139
Notional Amounts	$ 518,810	$ 1,037,763
Fair Value Asset (Liability), Net	12,678	10,923
Unrealized Loss Recorded in AOCL, net of tax	$ (27,889)	$ (39,248)
Other assets \| Interest rate swaps \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Number of Contracts \| contract	1	1
Notional Amounts	$ 350,000	$ 350,000
Fair Value Asset (Liability), Net	4,746	3,952
Unrealized Loss Recorded in AOCL, net of tax	(27,889)	(39,248)
Other current assets \| Interest rate swaps \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Fair Value Asset (Liability), Net	$ 8,117	$ 6,346
Other current assets \| Foreign currency forwards \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Number of Contracts \| contract		138
Notional Amounts		$ 687,763
Fair Value Asset (Liability), Net		625
Unrealized Loss Recorded in AOCL, net of tax		$ 0
Accrued liabilities \| Foreign currency forwards \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Number of Contracts \| contract	32
Notional Amounts	$ 168,810
Fair Value Asset (Liability), Net	(185)
Unrealized Loss Recorded in AOCL, net of tax	$ 0

Derivatives and Hedging - Deriv

Derivatives and Hedging - Derivative Gains And Losses That Have Been Recognized In Condensed Consolidated Statements Of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Total (income) expense, net	$ 2,381	$ 6,480	$ 6,792	$ 59
Interest expense (income), net
Derivative Instruments, Gain (Loss) [Line Items]
Total (income) expense, net	$ 4,948	$ 5,185	$ 15,159	$ 17,515
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income, net	Other income, net	Other income, net	Other income, net
Other (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Total (income) expense, net	$ (2,567)	$ 1,295	$ (8,367)	$ (17,456)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income, net	Other income, net	Other income, net	Other income, net

Fair Value Disclosures - Assets

Fair Value Disclosures - Assets And Liabilities Measured At Fair Value On Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets:
Total Assets	$ 116,963	$ 103,917
Level 1
Assets:
Total Assets	12,683	6,065
Level 1 \| Deferred compensation plan assets
Assets:
Total Assets	12,683	6,065
Level 2
Assets:
Total Assets	104,280	97,852
Liabilities:
Total Liabilities	110,156	99,252
Level 2 \| Foreign currency forward contracts
Assets:
Total Assets	193	3,236
Liabilities:
Total Liabilities	378	2,611
Level 2 \| Interest rate swap contracts
Assets:
Total Assets	12,863	10,298
Level 2 \| Deferred compensation plan assets
Assets:
Total Assets	91,224	84,318
Level 2 \| Deferred compensation plan liabilities
Liabilities:
Total Liabilities	$ 109,778	$ 96,641

Fair Value Disclosures - Fair V

Fair Value Disclosures - Fair Value of Debt Instruments (Details) - Senior Notes - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	$ 2,181,344	$ 2,179,209
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,915,754	1,953,562
2028 Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	793,794	792,934
2028 Notes \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	729,888	740,864
2029 Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	594,580	593,951
2029 Notes \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	514,578	523,842
2030 Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	792,970	792,324
2030 Notes \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 671,288	$ 688,856

Fair Value Disclosures - Narrat

Fair Value Disclosures - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on impairment of lease related assets, net			$ 19,062	$ 37,546
Selling, general and administrative
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on impairment of lease related assets, net	$ 300	$ 2,000	$ 19,000	$ 37,500

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Leases - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Lessee, Lease, Description [Line Items]
Renewal term	10 years		10 years
Option to terminate, term			1 year
Loss on impairment of lease related assets, net			$ 19,062	$ 37,546
Right-of-use Assets
Lessee, Lease, Description [Line Items]
Loss on impairment of lease related assets, net	$ 200	$ 1,700	13,600	27,000
Leasehold Improvements
Lessee, Lease, Description [Line Items]
Loss on impairment of lease related assets, net	100	300	5,400	10,500
Selling, general and administrative
Lessee, Lease, Description [Line Items]
Loss on impairment of lease related assets, net	$ 300	$ 2,000	$ 19,000	$ 37,500

Leases - Net Lease Costs (Detai

Leases - Net Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Leases - Net Lease Costs (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating lease cost	$ 27,941	$ 29,052	$ 85,307	$ 88,948
Lease cost	6,073	4,148	16,353	11,199
Sublease income	(13,906)	(11,621)	(39,831)	(34,358)
Total lease cost, net	20,108	21,579	61,829	65,789
Cash paid for amounts included in the measurement of operating lease liabilities	39,645	34,255	109,787	103,114
Cash receipts from sublease arrangements	13,362	11,500	38,580	34,130
Right-of-use assets obtained in exchange for new operating lease liabilities	1,476	7,438	9,467	19,120
Cost for subleasing activities	$ 10,900	$ 10,400	$ 32,300	$ 31,300

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Leases [Abstract]
Accounts payable and accrued liabilities	$ 98,686	$ 99,717
Operating lease liabilities	531,048	597,267
Total operating lease liabilities included in the Condensed Consolidated Balance Sheets	$ 629,734	$ 696,984
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accounts payable and accrued liabilities	Accounts payable and accrued liabilities

Subsequent Events - (Details)

Subsequent Events - (Details) - USD ($)	Oct. 31, 2023	Sep. 30, 2023	Feb. 28, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2015
Subsequent Event [Line Items]
Stock repurchase program, additional authorized amount			$ 400,000,000	$ 1,000,000,000	$ 1,600,000,000
Stock repurchase program, authorized amount						$ 1,200,000,000
Stock repurchase program, remaining authorized repurchase amount		$ 610,800,000
Subsequent Event
Subsequent Event [Line Items]
Stock repurchase program, additional authorized amount	$ 500,000,000
Stock repurchase program, authorized amount	4,200,000,000
Stock repurchase program, remaining authorized repurchase amount	$ 500,000,000