MSCI (MSCI) 10-Q 27 Jul 21 2021 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Jul. 20, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Trading Symbol	MSCI
Entity Registrant Name	MSCI INC.
Entity Central Index Key	0001408198
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		82,442,291
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-33812
Entity Tax Identification Number	13-4038723
Entity Address, Address Line One	7 World Trade Center
Entity Address, Address Line Two	250 Greenwich Street, 49th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10007
City Area Code	212
Local Phone Number	804-3900
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	DE
Title of 12(b) Security	Common stock, par value $0.01 per share
Security Exchange Name	NYSE
Document Quarterly Report	true
Document Transition Report	false

Condensed Consolidated Statemen

Condensed Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 1,972,002	$ 1,300,521
Accounts receivable, net of allowances	488,570	558,569
Prepaid income taxes	57,638	20,097
Prepaid and other assets	40,333	46,411
Total current assets	2,558,543	1,925,598
Property, equipment and leasehold improvements, net	71,432	80,446
Right of use assets	146,070	153,330
Goodwill	1,566,612	1,566,022
Intangible assets, net	208,473	234,748
Equity method investment	187,452	190,898
Deferred tax assets	27,696	23,627
Other non-current assets	24,798	23,978
Total assets	4,791,076	4,198,647
Current liabilities:
Accounts payable	11,253	14,253
Income taxes payable	32,308	26,195
Accrued compensation and related benefits	109,205	161,557
Other accrued liabilities	135,738	143,894
Deferred revenue	662,168	675,870
Total current liabilities	950,672	1,021,769
Long-term debt	3,963,622	3,366,777
Long-term operating lease liabilities	145,285	152,342
Deferred tax liabilities	8,347	12,774
Other non-current liabilities	90,957	88,219
Total liabilities	5,158,883	4,641,881
Commitments and Contingencies (see Note 7)
Shareholders' equity (deficit):
Preferred stock (par value $0.01, 100,000,000 shares authorized; no shares issued)
Common stock (par value $0.01; 750,000,000 common shares authorized; 133,142,605 and 132,829,175 common shares issued and 82,437,837 and 82,573,407 common shares outstanding at June 30, 2021 and December 31, 2020, respectively)	1,331	1,328
Treasury shares, at cost (50,704,768 and 50,255,768 common shares held at June 30, 2021 and December 31, 2020, respectively)	(4,529,573)	(4,342,535)
Additional paid in capital	1,433,717	1,402,537
Retained earnings	2,785,727	2,554,295
Accumulated other comprehensive loss	(59,009)	(58,859)
Total shareholders' equity (deficit)	(367,807)	(443,234)
Total liabilities and shareholders' equity (deficit)	$ 4,791,076	$ 4,198,647

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Financial Condition (Parenthetical) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	133,142,605	132,829,175
Common stock, shares outstanding	82,437,837	82,573,407
Treasury shares	50,704,768	50,255,768

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Operating revenues	$ 498,180	$ 409,616	$ 976,603	$ 826,396
Operating expenses:
Cost of revenues	87,327	70,456	173,107	145,065
Selling and marketing	58,191	51,617	114,658	107,166
Research and development	27,531	22,534	52,393	49,096
General and administrative	30,182	28,309	64,910	59,142
Amortization of intangible assets	30,396	14,062	45,464	27,838
Depreciation and amortization of property, equipment and leasehold improvements	7,020	7,463	14,163	15,030
Total operating expenses	240,647	194,441	464,695	403,337
Operating income	257,533	215,175	511,908	423,059
Interest income	(347)	(771)	(733)	(4,254)
Interest expense	39,557	41,227	77,141	81,458
Other expense (income)	22,628	35,552	23,777	43,839
Other expense (income), net	61,838	76,008	100,185	121,043
Income before provision for income taxes	195,695	139,167	411,723	302,016
Provision for income taxes	30,272	24,044	49,481	38,768
Net income	$ 165,423	$ 115,123	$ 362,242	$ 263,248
Earnings per basic common share	$ 2.01	$ 1.38	$ 4.39	$ 3.12
Earnings per diluted common share	$ 1.99	$ 1.36	$ 4.34	$ 3.10
Weighted average shares outstanding used in computing earnings per share
Basic	82,454	83,666	82,546	84,268
Diluted	83,295	84,349	83,393	84,948

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 165,423	$ 115,123	$ 362,242	$ 263,248
Other comprehensive (loss) income:
Foreign currency translation adjustments	879	1,562	(826)	(10,801)
Income tax effect	(35)	(379)	577	2,089
Foreign currency translation adjustments, net	844	1,183	(249)	(8,712)
Pension and other post-retirement adjustments	(59)	(88)	197	218
Income tax effect	22	41	(98)	5
Pension and other post-retirement adjustments, net	(37)	(47)	99	223
Other comprehensive (loss) income, net of tax	807	1,136	(150)	(8,489)
Comprehensive income	$ 166,230	$ 116,259	$ 362,092	$ 254,759

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Shareholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2019	$ (76,714)	$ 631	$ 1,324	$ (3,565,784)	$ 1,351,031	$ 2,199,294	$ 631	$ (62,579)
Net income	148,125					148,125
Dividends declared	(59,233)					(59,233)
Dividends paid in shares	78				78
Other comprehensive income (loss), net of tax	(9,625)							(9,625)
Common stock issued	4		4
Shares withheld for tax withholding and exercises	(47,195)			(47,195)
Compensation payable in common stock	15,333				15,333
Common stock repurchased and held in treasury	(325,699)			(325,699)
Common stock issued to Directors and (held in)/released from treasury	(36)			(36)
Balance at Mar. 31, 2020	(354,331)		1,328	(3,938,714)	1,366,442	2,288,817		(72,204)
Balance at Dec. 31, 2019	(76,714)	$ 631	1,324	(3,565,784)	1,351,031	2,199,294	$ 631	(62,579)
Net income	263,248
Balance at Jun. 30, 2020	(310,932)		1,328	(3,968,544)	1,380,772	2,346,580		(71,068)
Balance at Mar. 31, 2020	(354,331)		1,328	(3,938,714)	1,366,442	2,288,817		(72,204)
Net income	115,123					115,123
Dividends declared	(57,360)					(57,360)
Dividends paid in shares	36				36
Other comprehensive income (loss), net of tax	1,136							1,136
Shares withheld for tax withholding and exercises	(603)			(603)
Compensation payable in common stock	14,294				14,294
Common stock repurchased and held in treasury	(31,071)			(31,071)
Common stock issued to Directors and (held in)/released from treasury	1,844			1,844
Balance at Jun. 30, 2020	(310,932)		1,328	(3,968,544)	1,380,772	2,346,580		(71,068)
Balance at Dec. 31, 2020	(443,234)		1,328	(4,342,535)	1,402,537	2,554,295		(58,859)
Net income	196,819					196,819
Dividends declared	(65,947)					(65,947)
Dividends paid in shares	66				66
Other comprehensive income (loss), net of tax	(957)							(957)
Common stock issued	3		3
Shares withheld for tax withholding and exercises	(52,814)			(52,814)
Compensation payable in common stock	18,842				18,842
Common stock repurchased and held in treasury	(134,340)			(134,340)
Common stock issued to Directors and (held in)/released from treasury	(20)			(20)
Balance at Mar. 31, 2021	(481,582)		1,331	(4,529,709)	1,421,445	2,685,167		(59,816)
Balance at Dec. 31, 2020	(443,234)		1,328	(4,342,535)	1,402,537	2,554,295		(58,859)
Net income	362,242
Balance at Jun. 30, 2021	(367,807)		1,331	(4,529,573)	1,433,717	2,785,727		(59,009)
Balance at Mar. 31, 2021	(481,582)		1,331	(4,529,709)	1,421,445	2,685,167		(59,816)
Net income	165,423					165,423
Dividends declared	(64,863)					(64,863)
Dividends paid in shares	20				20
Other comprehensive income (loss), net of tax	807							807
Shares withheld for tax withholding and exercises	(620)			(620)
Compensation payable in common stock	12,252				12,252
Common stock issued to Directors and (held in)/released from treasury	756			756
Balance at Jun. 30, 2021	$ (367,807)		$ 1,331	$ (4,529,573)	$ 1,433,717	$ 2,785,727		$ (59,009)

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Shareholders' Equity (Deficit) (Parenthetical) - $ / shares	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Stockholders Equity [Abstract]
Dividends per common share	$ 0.78	$ 0.78	$ 0.68	$ 0.68	$ 1.56	$ 1.36

Condensed Consolidated Statem_7

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net income	$ 362,242	$ 263,248
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangible assets	45,464	27,838
Stock-based compensation expense	30,856	29,265
Depreciation and amortization of property, equipment and leasehold improvements	14,163	15,030
Amortization of right of use assets	12,129	12,017
Amortization of debt origination fees	2,340	2,231
Loss on extinguishment of debt	21,792	44,930
Deferred taxes	(8,488)	(9,844)
Other adjustments	4,036	582
Changes in assets and liabilities:
Accounts receivable	69,119	32,131
Prepaid income taxes	(37,679)	12,364
Prepaid and other assets	4,597	3,849
Accounts payable	(5,211)	(101)
Accrued compensation and related benefits	(50,793)	(69,324)
Income taxes payable	7,699	16,187
Other accrued liabilities	(10,359)	(8,631)
Deferred revenue	(12,668)	14,818
Long-term operating lease liabilities	(11,135)	(11,615)
Other	2,410	411
Net cash provided by operating activities	440,514	375,386
Cash flows from investing activities
Acquisition of equity method investment		(190,816)
Capitalized software development costs	(18,937)	(14,761)
Capital expenditures	(2,473)	(7,597)
Other	(911)
Net cash used in investing activities	(22,321)	(213,174)
Cash flows from financing activities
Proceeds from borrowings, inclusive of premium	1,103,750	1,405,000
Repayment of borrowings	(518,245)	(1,142,382)
Repurchase of common stock held in treasury	(187,774)	(404,567)
Payment of dividends	(130,557)	(116,409)
Payment of debt issuance costs in connection with debt	(10,316)	(16,693)
Net cash provided by (used in) financing activities	256,858	(275,051)
Effect of exchange rate changes	(3,570)	(8,751)
Net increase (decrease) in cash	671,481	(121,590)
Cash and cash equivalent, beginning of period	1,300,521	1,506,567
Cash and cash equivalent, end of period	1,972,002	1,384,977
Supplemental disclosure of cash flow information:
Cash paid for interest	77,076	90,623
Cash paid for income taxes, net of refunds received	83,139	19,560
Supplemental disclosure of non-cash investing activities
Property, equipment and leasehold improvements in other accrued liabilities	4,393	5,092
Supplemental disclosure of non-cash financing activities
Cash dividends declared, but not yet paid	$ 1,582	$ 1,129

Introduction and Basis of Prese

Introduction and Basis of Presentation	6 Months Ended
	Jun. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Introduction and Basis of Presentation	1. INTRODUCTION AND BASIS OF PRESENTATION MSCI Inc., together with its wholly owned subsidiaries (the “Company” or “MSCI”) provides critical decision support tools and services that bring greater transparency to the global financial markets. MSCI’s tools and services include indexes; portfolio construction tools and risk-management services; environmental, social and governance (“ESG”) and climate solutions; and real estate benchmarks, return analytics services and market insights; much of which can be accessed by clients through multiple channels and platforms. Basis of Presentation and Use of Estimates These unaudited condensed consolidated financial statements include the accounts of MSCI and its wholly owned subsidiaries and include all adjustments of a normal, recurring nature necessary to state fairly the financial condition as of June 30, 2021 and December 31, 2020, the results of operations, comprehensive income and shareholders’ equity (deficit) for the three and six months ended June 30, 2021 and 2020 and cash flows for the six months ended June 30, 2021 and 2020. The unaudited condensed consolidated statement of financial condition and related financial statement information as of December 31, 2020 have been derived from the 2020 audited consolidated financial statements but do not include all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in MSCI’s Annual Report on Form 10-K for the year ended December 31, 2020. The results of operations for interim periods are not necessarily indicative of results for the entire year. The Company’s unaudited condensed consolidated financial statements are prepared in accordance with GAAP. These accounting principles require the Company to make certain estimates and judgments that can affect the reported amounts of assets and liabilities as of the date of the unaudited condensed consolidated financial statements, as well as the reported amounts of operating revenues and expenses during the periods presented. Significant estimates and assumptions made by management include the deferral and recognition of revenue, research and development and software capitalization, assessment of impairment of long-lived assets, accrued compensation, income taxes, incremental borrowing rates and other matters that affect the unaudited condensed consolidated financial statements and related disclosures. The Company believes that estimates used in the preparation of these unaudited condensed consolidated financial statements are reasonable; however, actual results could differ materially from these estimates. Intercompany balances and transactions are eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current period presentation. Effective January 1, 2021, the ESG and Climate operating segment is being presented as a separate reportable segment. The operating segments of Real Estate and The Burgiss Group, LLC (“Burgiss”) do not individually meet the segment reporting thresholds and have been combined and presented as part of the All Other – Private Assets reportable segment. The Company’s ownership interest in Burgiss, a global provider of investment decision tools for private capital, is classified as an equity-method investment. Therefore, the All Other – Private Assets segment does not include the Company’s proportionate share of operating revenues and Adjusted EBITDA related to Burgiss. The Company’s proportionate share of the income or loss from its equity method investment in Burgiss is not a component of Adjusted EBITDA as it is reported as a component of other (expense) income, net. Concentrations For the six months ended June 30, 2021 and 2020, BlackRock, Inc. accounted for 12.4% and 10.9% of the Company’s consolidated operating revenues, respectively. For the six months ended June 30, 2021 and 2020, BlackRock, Inc. accounted for 19.8% and 17.9% of the Index segment operating revenues, respectively. No single customer represented 10.0% or more of operating revenues within the Analytics, ESG and Climate and All Other – Private Assets segments for the six months ended June 30, 2021 and 2020. Allowance for Credit Losses on Accounts Receivable Following the adoption of Accounting Standards Update No. 2016-13, “ Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments Changes in the allowance for credit losses on doubtful accounts receivable from December 31, 2019 to June 30, 2021 were as follows: Amount (in Balance as of December 31, 2019 $ 1,715 Addition (reduction) to credit loss expense 1,712 Write-offs, net of recoveries (1,844 ) Balance as of December 31, 2020 $ 1,583 Addition (reduction) to credit loss expense 523 Adjustments and write-offs, net of recoveries (389 ) Balance as of June 30, 2021 $ 1,717

Recent Accounting Standards Upd

Recent Accounting Standards Updates	6 Months Ended
	Jun. 30, 2021
Accounting Changes And Error Corrections [Abstract]
Recent Accounting Standards Updates	2. RECENT ACCOUNTING STANDARDS UPDATES There are no pending accounting standards updates that are currently expected to have a material impact on the Company.

Revenue Recognition

Revenue Recognition	6 Months Ended
	Jun. 30, 2021
Revenue From Contract With Customer [Abstract]
Revenue Recognition	3. REVENUE RECOGNITION MSCI’s revenues are characterized by product type, which broadly reflects the nature of how they are recognized. The Company’s revenue types are recurring subscription, asset-based fees and non-recurring revenues. The Company also reports revenues by segment. The tables that follow present the disaggregated revenues for the periods indicated: For the Three Months ended June 30, 2021 Segments (in thousands) Index Analytics ESG and Climate All Other - Private Assets Total Revenue Types Recurring subscriptions $ 160,061 $ 133,368 $ 38,567 $ 16,134 $ 348,130 Asset-based fees 136,142 — — — 136,142 Non-recurring 9,760 2,534 741 873 13,908 Total $ 305,963 $ 135,902 $ 39,308 $ 17,007 $ 498,180 For the Six Months ended June 30, 2021 Segments (in thousands) Index Analytics ESG and Climate All Other - Private Assets Total Revenue Types Recurring subscriptions $ 315,178 $ 265,040 $ 72,707 $ 32,937 $ 685,862 Asset-based fees 262,848 — — — 262,848 Non-recurring 20,428 4,879 1,351 1,235 27,893 Total $ 598,454 $ 269,919 $ 74,058 $ 34,172 $ 976,603 For the Three Months ended June 30, 2020 Segments (in thousands) Index Analytics ESG and Climate All Other - Private Assets Total Revenue Types Recurring subscriptions $ 145,404 $ 126,189 $ 25,908 $ 12,383 $ 309,884 Asset-based fees 88,075 — — — 88,075 Non-recurring 9,429 1,374 394 460 11,657 Total $ 242,908 $ 127,563 $ 26,302 $ 12,843 $ 409,616 For the Six Months ended June 30, 2020 Segments (in thousands) Index Analytics ESG and Climate All Other - Private Assets Total Revenue Types Recurring subscriptions $ 285,244 $ 250,254 $ 50,809 $ 28,002 $ 614,309 Asset-based fees 188,271 — — — 188,271 Non-recurring 18,649 2,817 726 1,624 23,816 Total $ 492,164 $ 253,071 $ 51,535 $ 29,626 $ 826,396 The tables that follow present the change in accounts receivable and in deferred revenue between the dates indicated: Accounts receivable Deferred revenue (in thousands) Opening (December 31, 2020) $ 558,569 $ 675,870 Closing (June 30, 2021) 488,570 662,168 Increase/(decrease) $ (69,999 ) $ (13,702 ) Accounts receivable Deferred revenue (in thousands) Opening (December 31, 2019) $ 499,268 $ 574,656 Closing (June 30, 2020) 466,096 587,113 Increase/(decrease) $ (33,172 ) $ 12,457 The amounts of revenue recognized in the periods that were included in the opening current deferred revenue, which reflects contract liability amounts, were $208.3 million and $478.6 million for the three and six months ended June 30, 2021, respectively and $173.3 million and $385.6 million for the three and six months ended June 30, 2020, respectively. The difference between the opening and closing balances of the Company’s deferred revenue was primarily driven by an increase in the amortization of deferred revenue to operating revenues, partially offset by an increase in billings. MSCI had an insignificant long-term deferred revenue balance as of June 30, 2021, reflected as a part of “Other non-current liabilities” on its Unaudited Condensed Consolidated Statement of Financial Condition. For contracts that have a duration of one year or less, the Company has not disclosed either the remaining performance obligation as of the end of the reporting period or when the Company expects to recognize the revenue. The remaining performance obligations for contracts that have a duration of greater than one year and the periods in which they are expected to be recognized are as follows: As of June 30, 2021 (in thousands) First 12-month period $ 351,845 Second 12-month period 197,787 Third 12-month period 65,524 Periods thereafter 16,706 Total $ 631,862

Earnings Per Common Share

Earnings Per Common Share	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share	4. EARNINGS PER COMMON SHARE Basic earnings per share (“EPS”) is computed by dividing net income by the weighted average number of common shares outstanding during the period. Common shares outstanding include common stock and vested restricted stock unit awards where recipients have satisfied the explicit vesting terms. Diluted EPS reflects the assumed conversion of all dilutive securities. The following table presents the computation of basic and diluted EPS: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands, except per share data) Net income $ 165,423 $ 115,123 $ 362,242 $ 263,248 Basic weighted average common shares outstanding 82,454 83,666 82,546 84,268 Effect of dilutive securities: Restricted stock units 841 683 847 680 Diluted weighted average common shares outstanding 83,295 84,349 83,393 84,948 Earnings per basic common share $ 2.01 $ 1.38 $ 4.39 $ 3.12 Earnings per diluted common share $ 1.99 $ 1.36 $ 4.34 $ 3.10

Property, Equipment and Leaseho

Property, Equipment and Leasehold Improvements, Net	6 Months Ended
	Jun. 30, 2021
Property Plant And Equipment [Abstract]
Property, Equipment and Leasehold Improvements, Net	5. PROPERTY, EQUIPMENT AND LEASEHOLD IMPROVEMENTS, NET Property, equipment and leasehold improvements, net consisted of the following as of the specified dates: As of June 30, December 31, 2021 2020 (in thousands) Computer & related equipment $ 183,893 $ 186,786 Furniture & fixtures 14,988 15,276 Leasehold improvements 56,085 56,537 Work-in-process 2,810 2,996 Subtotal 257,776 261,595 Accumulated depreciation and amortization (186,344 ) (181,149 ) Property, equipment and leasehold improvements, net $ 71,432 $ 80,446 Depreciation and amortization expense of property, equipment and leasehold improvements was $7.0 million and $7.5 million for the three months ended June 30, 2021 and 2020, respectively. Depreciation and amortization expense of property, equipment and leasehold improvements was $14.2 million and $15.0 million for the six months ended June 30, 2021 and 2020, respectively.

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Net	6 Months Ended
	Jun. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, Net	6. GOODWILL AND INTANGIBLE ASSETS, NET Goodwill The following table presents goodwill by reportable segment: (in thousands) Index Analytics ESG and Climate All Other - Private Assets Total Goodwill at December 31, 2020 $ 1,205,758 $ 290,976 $ 48,047 $ 21,241 $ 1,566,022 Foreign exchange translation adjustment 365 — — 225 590 Goodwill at June 30, 2021 $ 1,206,123 $ 290,976 $ 48,047 $ 21,466 $ 1,566,612 Intangible Assets, Net The following table presents the amount of amortization expense related to intangible assets by category for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (in thousands) 2021 2020 2021 2020 Amortization expense of acquired intangible assets $ 8,376 $ 8,607 $ 16,744 $ 17,385 Amortization expense of internally developed capitalized software 6,007 5,455 12,707 10,453 Write-off of internally developed capitalized software 16,013 — 16,013 — Total amortization of intangible assets expense $ 30,396 $ 14,062 $ 45,464 $ 27,838 As a result of management’s decision to discontinue development and cease related sales activities of certain Analytics segment products and transition existing customers to other product offerings, the Company wrote off $16.0 million of certain internally developed capitalized software intangible assets (consisting of $46.3 million of gross intangible assets less $30.3 million of accumulated amortization) during the three months ended June 30, 2021. The non-cash charge is recorded as a component of “Amortization of intangible assets” on the Condensed Consolidated Statement of Income. The gross carrying and accumulated amortization amounts related to the Company’s intangible assets were as follows: As of June 30, December 31, 2021 2020 (in thousands) Gross intangible assets: Customer relationships $ 356,700 $ 356,700 Trademarks 207,300 207,300 Acquired technology and software 177,720 177,720 Internally developed capitalized software 85,838 113,188 Proprietary data 28,627 28,627 Subtotal 856,185 883,535 Foreign exchange translation adjustment (4,741 ) (5,262 ) Total gross intangible assets $ 851,444 $ 878,273 Accumulated amortization: Customer relationships $ (264,386 ) $ (253,465 ) Trademarks (147,773 ) (143,207 ) Acquired technology and software (174,390 ) (174,032 ) Internally developed capitalized software (39,813 ) (57,464 ) Proprietary data (16,680 ) (15,730 ) Subtotal (643,042 ) (643,898 ) Foreign exchange translation adjustment 71 373 Total accumulated amortization $ (642,971 ) $ (643,525 ) Net intangible assets: Customer relationships $ 92,314 $ 103,235 Trademarks 59,527 64,093 Acquired technology and software 3,330 3,688 Internally developed capitalized software 46,025 55,724 Proprietary data 11,947 12,897 Subtotal 213,143 239,637 Foreign exchange translation adjustment (4,670 ) (4,889 ) Total net intangible assets $ 208,473 $ 234,748 The following table presents the estimated amortization expense for the remainder of the year ending December 31, 2021 and succeeding years: Years Ending December 31, Amortization Expense (in thousands) Remainder of 2021 $ 26,782 2022 51,146 2023 45,359 2024 37,892 2025 21,290 Thereafter 26,004 Total $ 208,473

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	7. COMMITMENTS AND CONTINGENCIES Senior Unsecured Notes. The Company had an aggregate of $4,000.0 million in senior unsecured notes (collectively, the “Senior Notes”) outstanding at June 30, 2021, as presented in the table below: Principal Amount Outstanding at Carrying Value at Carrying Value at Fair Value at Fair Value at Maturity Date June 30, 2021 June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 (in thousands) Long-term debt 4.75% senior unsecured notes due 2026 August 1, 2026 - - 496,257 - 522,325 5.375% senior unsecured notes due 2027 May 15, 2027 500,000 496,145 495,819 533,825 538,100 4.000% senior unsecured notes due 2029 November 15, 2029 1,000,000 990,910 990,364 1,056,210 1,073,040 3.625% senior unsecured notes due 2030 September 1, 2030 900,000 893,932 395,458 923,022 419,428 3.875% senior unsecured notes due 2031 February 15, 2031 1,000,000 989,426 988,879 1,039,070 1,063,430 3.625% senior unsecured notes due 2031 November 1, 2031 600,000 593,209 - 617,244 - Total long-term debt $ 4,000,000 $ 3,963,622 $ 3,366,777 $ 4,169,371 $ 3,616,323 Interest payments attributable to the Senior Notes are due as presented in the following table: First semi-annual interest payment date Second semi-annual interest payment date Senior Notes 4.75% senior unsecured notes due 2026 February 1 August 1 5.375% senior unsecured notes due 2027 May 15 November 15 4.000% senior unsecured notes due 2029 May 15 November 15 3.625% senior unsecured notes due 2030 March 1 September 1 3.875% senior unsecured notes due 2031 June 1 December 1 3.625% senior unsecured notes due 2031 May 1 November 1 The fair market value of the Company’s debt obligations represent Level 2 valuations. The Company utilizes the market approach and obtains security pricing from a vendor who uses broker quotes and third-party pricing services to determine fair values. On March 26, 2021, the Company issued $500.0 million aggregate principal amount of 3.625% Senior Unsecured Notes due 2030 (the “2030 Senior Notes”), which constitute a further issuance of, are fully fungible with, rank equally with and form a single series with the $400.0 million aggregate principal amount of the 3.625% senior unsecured notes due 2030 issued on March 4, 2020. In connection with the completion of the offering, the Company announced that it intended to use a portion of the net proceeds from the offering, together with available cash, for the pre-maturity redemption or repurchase of all $500.0 million aggregate principal amount outstanding of its 4.750% senior unsecured notes due 2026 (the “2026 Senior Notes”). On April 12, 2021 the Company completed the pre-maturity redemption of all of its 2026 Senior Notes, which are reflected in the three months ended June 30, 2021. The pre-maturity redemption of the 2026 Senior Notes resulted in an approximately $21.8 million loss on extinguishment that was recorded in other expense (income) during the three months ended June 30, 2021, which includes an applicable premium of approximately $18.2 million (as set forth in the indenture governing the terms of the 2026 Senior Notes) and the write-off of approximately $3.6 million of unamortized debt issuance costs associated with the 2026 Senior Notes. The 2030 Senior Notes are scheduled to mature and be paid in full on September 1, 2030. At any time prior to March 1, 2025, the Company may redeem all or part of the 2030 Senior Notes at a redemption price equal to the sum of (i) 100% of the principal amount thereof, plus (ii) a make-whole premium as of the date of redemption, plus (iii) accrued and unpaid interest and additional interest, if any, thereon, to the date of redemption. In addition, the Company may redeem all or part of the 2030 Senior Notes, together with accrued and unpaid interest, on or after March 1, 2025, at redemption prices set forth in the indenture governing the 2030 Senior Notes. At any time prior to March 1, 2023, the Company may use the proceeds of certain equity offerings to redeem up to 35% of the aggregate principal amount of the 2030 Senior Notes, including any permitted additional notes, at a redemption price equal to 103.625% of the principal amount plus accrued and unpaid interest, if any, to the redemption date. On May 14, 2021, the Company issued $600.0 million aggregate principal amount of 3.625% Senior Unsecured Notes due 2031 (the “2031 Senior Notes”) in a private offering that was exempt from the registration requirements of the Securities Act of 1933, as amended. The 2031 Senior Notes are scheduled to mature and be paid in full on November 1, 2031. At any time prior to November 1, 2026, the Company may redeem all or part of the 2031 Senior Notes at a redemption price equal to the sum of (i) 100% of the principal amount thereof, plus (ii) a make-whole premium as of the date of redemption, plus (iii) accrued and unpaid interest, if any, thereon, to the date of redemption. In addition, the Company may redeem all or part of the 2031 Senior Notes, together with accrued and unpaid interest, on or after November 1, 2026, at redemption prices set forth in the indenture governing the 2031 Senior Notes. At any time prior to November 1, 2024, the Company may use the proceeds of certain equity offerings to redeem up to 35% of the aggregate principal amount of the 2031 Senior Notes, including any permitted additional notes, at a redemption price equal to 103.625% of the principal amount plus accrued and unpaid interest, if any, to the redemption date. Revolver. Since November 20, 2014, the Company has maintained a revolving credit agreement with a syndicate of banks (as amended, the “Revolving Credit Agreement”). On March 29, 2021, the Company entered into Amendment No. 4 (the “Fourth Amendment”) to the Revolving Credit Agreement. The Fourth Amendment, among other things, (i) increased aggregate commitments available to be borrowed by $100.0 million to an aggregate of $500.0 million of availability thereunder until November 2024, at which point the aggregate commitments will be $467.5 million, and (ii) extended the term to March 2026. At June 30, 2021, the Revolving Credit Agreement was undrawn. In connection with the closings of the Senior Notes offerings, entry into the Revolving Credit Agreement and the subsequent Amendments, the Company paid certain financing fees which, together with the existing fees related to prior credit facilities, are being amortized over their related lives. At June 30, 2021, $38.6 million of the deferred financing fees and premium remain unamortized, $0.5 million of which is included in “Prepaid and other assets,” $1.8 million of which is included in “Other non-current assets” and $36.3 million of which is included in “Long-term debt” on the Unaudited Condensed Consolidated Statement of Financial Condition.

Leases

Leases	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Leases	8. LEASES The Company recognized a total of $7.5 million and $8.9 million of operating lease expenses for the three months ended June 30, 2021 and 2020, respectively. The Company recognized a total of $15.1 million and $17.8 million of operating lease expenses for the six months ended June 30, 2021 and 2020, respectively. The amounts associated with variable lease costs, short-term lease costs and sublease income were not material for any of the three and six months ended June 30, 2021 and 2020. Future minimum commitments for the Company’s operating leases in place as of June 30, 2021, the interest and other relevant line items in the Unaudited Condensed Consolidated Statement of Financial Condition are as follows: Maturity of Lease Liabilities Operating (in thousands) Leases Remainder of 2021 $ 13,158 2022 26,672 2023 25,535 2024 20,231 2025 19,755 Thereafter 88,328 Total lease payments $ 193,679 Less: Interest (27,017 ) Present value of lease liabilities $ 166,662 Other accrued liabilities $ 21,377 Long-term operating lease liabilities $ 145,285 Lease term and discount rate for the Company’s operating leases in place as of June 30, 2021 are as follows: As of June 30, Lease Term and Discount Rate 2021 Weighted-average remaining lease term (years) 8.68 Weighted-average discount rate 3.32 % Other information for the Company’s operating leases in place for the six months ended June 30, 2021 are as follows: Six Months Ended Other Information June 30, (in thousands) 2021 2020 Operating cash flows used for operating leases $ 15,239 $ 15,355 Leased assets obtained in exchange for new operating lease liabilities $ 5,074 $ 7,491

Shareholders' Equity (Deficit)

Shareholders' Equity (Deficit)	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Shareholders' Equity (Deficit)	9. SHAREHOLDERS’ EQUITY (DEFICIT) Return of capital On October 29, 2020, the Board of Directors authorized a stock repurchase program for the purchase of up to $1,000.0 million worth of shares of MSCI’s common stock in addition to the $804.5 million of authorization then remaining under a previously existing share repurchase program (the “2020 Repurchase Program”) for a total of $1,804.5 million of stock repurchase authorization. Share repurchases made pursuant to the 2020 Repurchase Program may take place in the open market or in privately negotiated transactions from time to time based on market and other conditions. This authorization may be modified, suspended or terminated by the Board of Directors at any time without prior notice. As of June 30, 2021, there was $1,594.4 million of available authorization remaining under the 2020 Repurchase Program. The following table provides information with respect to repurchases of the Company’s common stock made on the open market: Six Months Ended Average Price Paid Per Share Total Number of Shares Repurchased Dollar Value of Shares Repurchased (in thousands) June 30, 2021 $ 407.70 330 $ 134,340 June 30, 2020 $ 250.65 1,423 $ 356,770 The following table presents dividends declared per common share as well as total amounts declared, distributed and deferred for the periods indicated: Dividends (in thousands, except per share amounts) Per Share Declared Distributed (Released)/Deferred 2021 Three Months Ended March 31, $ 0.78 $ 65,947 $ 66,153 $ (206 ) Three Months Ended June 30, 0.78 64,863 64,489 374 Total $ 1.56 $ 130,810 $ 130,642 $ 168 2020 Three Months Ended March 31, $ 0.68 $ 59,233 $ 59,455 $ (222 ) Three Months Ended June 30, 0.68 57,360 57,068 292 Total $ 1.36 $ 116,593 $ 116,523 $ 70 Common Stock. The following table presents activity related to shares of common stock issued and repurchased during the six months ended June 30, 2021: Common Stock Treasury Common Stock Issued Stock Outstanding Balance at December 31, 2020 132,829,175 (50,255,768 ) 82,573,407 Dividend payable/paid 160 (48 ) 112 Common stock issued 301,227 — 301,227 Shares withheld for tax withholding — (122,924 ) (122,924 ) Shares repurchased under stock repurchase programs — (329,508 ) (329,508 ) Shares issued to directors — — — Balance at March 31, 2021 133,130,562 (50,708,248 ) 82,422,314 Dividend payable/paid 43 (43 ) — Common stock issued 10,692 — 10,692 Shares withheld for tax withholding — (1,303 ) (1,303 ) Shares repurchased under stock repurchase programs — — — Shares issued to directors 1,308 4,826 6,134 Balance at June 30, 2021 133,142,605 (50,704,768 ) 82,437,837

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	10. INCOME TAXES The Company’s provision for income taxes was $49.5 million and $38.8 million for the six months ended June 30, 2021 and 2020, respectively. These amounts reflect effective tax rates of 12.0% and 12.8% for the six months ended June 30, 2021 and 2020, respectively. The effective tax rate of 12.0% for the six months ended June 30, 2021 reflects the Company’s estimate of the effective tax rate for the period and was impacted by certain favorable discrete items totaling $34.2 million, in relation to pretax income. For the six months ended June 30, 2021, these discrete items primarily related to $21.4 million of excess tax benefits recognized on share-based compensation vested during the period and $5.6 million related to the tax impact of loss on debt extinguishment recognized during the period on the redemption of the 2026 Senior Notes. Also included in the discrete items is a $2.3 million benefit related to the revaluation of deferred taxes as a result of the enactment of an increase in the UK corporate tax rate, a $2.1 million benefit related to the filing of prior year refund claims and $2.8 million of tax benefits related to other prior year items. In addition, the effective tax rate was impacted by the level of earnings. The effective tax rate of 12.8% for the six months ended June 30, 2020 reflects the Company’s estimate of the effective tax rate for the period and was impacted by certain favorable discrete items totaling $34.1 million. For the six months ended June 30, 2020, these discrete items primarily related to $21.5 million of excess tax benefits recognized on share-based compensation vested during the period and $11.5 million related to the tax impact of loss on debt extinguishment recognized during the period. The discrete items also included a $0.8 million benefit related to the revaluation of the cost of deemed repatriation of foreign earnings. In addition, the effective tax rate was impacted by a beneficial geographic mix of earnings. The Company is under examination by tax authorities in certain jurisdictions, including foreign jurisdictions, such as the United Kingdom, Switzerland and India, and states in which the Company has significant operations, such as New York and California. The tax years currently under examination vary by jurisdiction but include years ranging from 2008 through 2020. The Company regularly assesses the likelihood of additional assessments in each of the taxing jurisdictions in which it files income tax returns. The Company has established unrecognized tax benefits that the Company believes are adequate in relation to the potential for additional assessments. During the six months ended June 30, 2021, the Company’s unrecognized tax benefits increased by $15.5 million principally due to the filing of prior year refund claims. Once established, the Company adjusts unrecognized tax benefits only when more information is available or when an event occurs necessitating a change. Based on the current status of income tax audits, the Company believes it is reasonably possible that the total amount of unrecognized benefits may decrease by approximately $30.0 million in the next twelve months as a result of the resolution of tax examinations.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Segment Information	11. SEGMENT INFORMATION The Company has five operating segments: Index, Analytics, ESG and Climate, Real Estate and Burgiss, which are presented as the following four reportable segments: Index, Analytics, ESG and Climate and All Other – Private Assets. Effective January 1, 2021, the Company began presenting four reportable segments with the ESG and Climate operating segment being presented as a separate reportable segment. The operating segments of Real Estate and Burgiss do not individually meet the segment reporting thresholds and have been combined and presented as part of All Other – Private Assets reportable segment. The Company’s ownership interest in Burgiss is classified as an equity-method investment . T herefore, the All Other – Private Assets segment does not include the Company’s proportionate share of operating revenues and Adjusted EBITDA related to Burgiss . The Company’s proportionate share of the income or loss from its equity-method investment in Burgiss is not a component of Adjusted EBITDA as it is reported as a component of other (expense) income, net. Prior period amounts have been recast to reflect the current presentation. The Index operating segment offers equity and fixed income indexes. The indexes are used in many areas of the investment process, including index-linked product creation (e.g., Exchange Traded Funds (“ETFs”) and futures and options), performance benchmarking, portfolio construction and rebalancing, broker-dealer structured products and asset allocation. The Analytics operating segment offers risk management, performance attribution and portfolio management content, applications and services that provide clients with an integrated view of risk and return and an analysis of market, credit, liquidity and counterparty risk across all major asset classes, spanning short-, medium- and long-term time horizons. Clients access Analytics content through MSCI’s own proprietary applications and application programming interfaces, third-party applications or directly through their own platforms. Additionally, the Analytics operating segment also provides various managed services to help clients operate more efficiently, including consolidation of client portfolio data from various sources, review and reconciliation of input data and results, and customized reporting. The ESG and Climate operating segment offers products and services that help institutional investors understand how ESG and climate considerations can impact the long-term risk and return of their portfolio and individual security-level investments. In addition, MSCI ESG Research data and ratings, as well as climate solutions, are used in the construction of equity and fixed income indexes to help institutional investors more effectively benchmark ESG and climate investment performance, issue index-based investment products, as well as manage, measure and report on ESG and climate mandates. The Real Estate operating segment offers research, reporting, market data and benchmarking offerings that provide real estate performance analysis for funds, investors and managers. Real Estate performance and risk analytics range from enterprise-wide to property-specific analysis. The Real Estate operating segment also provides business intelligence to real estate owners, managers, developers and brokers worldwide. The Burgiss operating segment represents the Company’s equity method investment in Burgiss, a global provider of investment decision support tools for private capital. The change in reportable segments has not resulted in any changes to MSCI’s Chief Operating Decision Maker (“CODM”) or the basis for segment profitability from the information disclosed in our 2020 Annual Report on Form 10-K. The CODM continues to measure and evaluate reportable segments based on segment operating revenues as well as Adjusted EBITDA and other measures. The Company excludes the following items from segment Adjusted EBITDA: provision for income taxes, other expense (income), net, depreciation and amortization of property, equipment and leasehold improvements, amortization of intangible assets and, at times, certain other transactions or adjustments, that the CODM does not consider for the purposes of making decisions to allocate resources among segments or to assess segment performance. Although these amounts are excluded from segment Adjusted EBITDA, they are included in reported consolidated net income and are included in the reconciliation that follows. The following table presents operating revenues by reportable segment for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Operating revenues Index $ 305,963 $ 242,908 $ 598,454 $ 492,164 Analytics 135,902 127,563 269,919 253,071 ESG and Climate 39,308 26,302 74,058 51,535 All Other - Private Assets 17,007 12,843 34,172 29,626 Total $ 498,180 $ 409,616 $ 976,603 $ 826,396 The following table presents segment profitability and a reconciliation to net income for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Index Adjusted EBITDA $ 233,468 $ 183,256 $ 453,347 $ 366,843 Analytics Adjusted EBITDA 49,814 46,167 95,545 82,484 ESG and Climate Adjusted EBITDA 5,720 5,499 10,765 9,125 All Other - Private Assets Adjusted EBITDA 5,947 1,778 11,878 7,475 Total operating segment profitability 294,949 236,700 571,535 465,927 Amortization of intangible assets 30,396 14,062 45,464 27,838 Depreciation and amortization of property, equipment and leasehold improvements 7,020 7,463 14,163 15,030 Operating income 257,533 215,175 511,908 423,059 Other expense (income), net 61,838 76,008 100,185 121,043 Provision for income taxes 30,272 24,044 49,481 38,768 Net income $ 165,423 $ 115,123 $ 362,242 $ 263,248 Operating revenues by geography are based on the shipping address of the ultimate customer utilizing the product. The following table presents revenue by geographic area for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Operating revenues Americas: United States $ 200,781 $ 175,819 $ 397,470 $ 356,865 Other 21,026 16,891 41,199 34,647 Total Americas 221,807 192,710 438,669 391,512 Europe, the Middle East and Africa ("EMEA"): United Kingdom 84,802 62,826 163,883 127,887 Other 113,258 90,209 219,452 178,138 Total EMEA 198,060 153,035 383,335 306,025 Asia & Australia: Japan 22,993 19,725 44,635 39,117 Other 55,320 44,146 109,964 89,742 Total Asia & Australia 78,313 63,871 154,599 128,859 Total $ 498,180 $ 409,616 $ 976,603 $ 826,396 Long-lived assets consist of property, equipment and leasehold improvements, right of use assets and internally developed capitalized software, net of accumulated depreciation and amortization. The following table presents long-lived assets by geographic area on the dates indicated: As of June 30, December 31, 2021 2020 (in thousands) Long-lived assets Americas: United States $ 161,363 $ 182,776 Other 14,739 13,949 Total Americas 176,102 196,725 EMEA: United Kingdom 19,596 19,678 Other 32,720 33,561 Total EMEA 52,316 53,239 Asia & Australia: Japan 1,471 1,896 Other 33,934 37,946 Total Asia & Australia 35,405 39,842 Total $ 263,823 $ 289,806

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	12. SUBSEQUENT EVENTS On July 26, 2021, the Board of Directors declared a quarterly cash dividend of $1.04 per share for the three months ending September 30, 2021 (“third quarter 2021”). The third quarter 2021 dividend is payable on August 31, 2021 to shareholders of record as of the close of trading on August 13, 2021.

Introduction and Basis of Pre_2

Introduction and Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation and Use of Estimates	Basis of Presentation and Use of Estimates These unaudited condensed consolidated financial statements include the accounts of MSCI and its wholly owned subsidiaries and include all adjustments of a normal, recurring nature necessary to state fairly the financial condition as of June 30, 2021 and December 31, 2020, the results of operations, comprehensive income and shareholders’ equity (deficit) for the three and six months ended June 30, 2021 and 2020 and cash flows for the six months ended June 30, 2021 and 2020. The unaudited condensed consolidated statement of financial condition and related financial statement information as of December 31, 2020 have been derived from the 2020 audited consolidated financial statements but do not include all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in MSCI’s Annual Report on Form 10-K for the year ended December 31, 2020. The results of operations for interim periods are not necessarily indicative of results for the entire year. The Company’s unaudited condensed consolidated financial statements are prepared in accordance with GAAP. These accounting principles require the Company to make certain estimates and judgments that can affect the reported amounts of assets and liabilities as of the date of the unaudited condensed consolidated financial statements, as well as the reported amounts of operating revenues and expenses during the periods presented. Significant estimates and assumptions made by management include the deferral and recognition of revenue, research and development and software capitalization, assessment of impairment of long-lived assets, accrued compensation, income taxes, incremental borrowing rates and other matters that affect the unaudited condensed consolidated financial statements and related disclosures. The Company believes that estimates used in the preparation of these unaudited condensed consolidated financial statements are reasonable; however, actual results could differ materially from these estimates. Intercompany balances and transactions are eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current period presentation. Effective January 1, 2021, the ESG and Climate operating segment is being presented as a separate reportable segment. The operating segments of Real Estate and The Burgiss Group, LLC (“Burgiss”) do not individually meet the segment reporting thresholds and have been combined and presented as part of the All Other – Private Assets reportable segment. The Company’s ownership interest in Burgiss, a global provider of investment decision tools for private capital, is classified as an equity-method investment. Therefore, the All Other – Private Assets segment does not include the Company’s proportionate share of operating revenues and Adjusted EBITDA related to Burgiss. The Company’s proportionate share of the income or loss from its equity method investment in Burgiss is not a component of Adjusted EBITDA as it is reported as a component of other (expense) income, net.
Concentrations	Concentrations For the six months ended June 30, 2021 and 2020, BlackRock, Inc. accounted for 12.4% and 10.9% of the Company’s consolidated operating revenues, respectively. For the six months ended June 30, 2021 and 2020, BlackRock, Inc. accounted for 19.8% and 17.9% of the Index segment operating revenues, respectively. No single customer represented 10.0% or more of operating revenues within the Analytics, ESG and Climate and All Other – Private Assets segments for the six months ended June 30, 2021 and 2020.
Allowance for Credit Losses on Accounts Receivable	Allowance for Credit Losses on Accounts Receivable Following the adoption of Accounting Standards Update No. 2016-13, “ Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments Changes in the allowance for credit losses on doubtful accounts receivable from December 31, 2019 to June 30, 2021 were as follows: Amount (in Balance as of December 31, 2019 $ 1,715 Addition (reduction) to credit loss expense 1,712 Write-offs, net of recoveries (1,844 ) Balance as of December 31, 2020 $ 1,583 Addition (reduction) to credit loss expense 523 Adjustments and write-offs, net of recoveries (389 ) Balance as of June 30, 2021 $ 1,717
Recent Accounting Standards Updates	There are no pending accounting standards updates that are currently expected to have a material impact on the Company.

Introduction and Basis of Pre_3

Introduction and Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Changes in Allowance for Credit Losses on Doubtful Accounts Receivable	Changes in the allowance for credit losses on doubtful accounts receivable from December 31, 2019 to June 30, 2021 were as follows: Amount (in Balance as of December 31, 2019 $ 1,715 Addition (reduction) to credit loss expense 1,712 Write-offs, net of recoveries (1,844 ) Balance as of December 31, 2020 $ 1,583 Addition (reduction) to credit loss expense 523 Adjustments and write-offs, net of recoveries (389 ) Balance as of June 30, 2021 $ 1,717

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Jun. 30, 2021
Revenue From Contract With Customer [Abstract]
Disaggregation of Revenue	The tables that follow present the disaggregated revenues for the periods indicated: For the Three Months ended June 30, 2021 Segments (in thousands) Index Analytics ESG and Climate All Other - Private Assets Total Revenue Types Recurring subscriptions $ 160,061 $ 133,368 $ 38,567 $ 16,134 $ 348,130 Asset-based fees 136,142 — — — 136,142 Non-recurring 9,760 2,534 741 873 13,908 Total $ 305,963 $ 135,902 $ 39,308 $ 17,007 $ 498,180 For the Six Months ended June 30, 2021 Segments (in thousands) Index Analytics ESG and Climate All Other - Private Assets Total Revenue Types Recurring subscriptions $ 315,178 $ 265,040 $ 72,707 $ 32,937 $ 685,862 Asset-based fees 262,848 — — — 262,848 Non-recurring 20,428 4,879 1,351 1,235 27,893 Total $ 598,454 $ 269,919 $ 74,058 $ 34,172 $ 976,603 For the Three Months ended June 30, 2020 Segments (in thousands) Index Analytics ESG and Climate All Other - Private Assets Total Revenue Types Recurring subscriptions $ 145,404 $ 126,189 $ 25,908 $ 12,383 $ 309,884 Asset-based fees 88,075 — — — 88,075 Non-recurring 9,429 1,374 394 460 11,657 Total $ 242,908 $ 127,563 $ 26,302 $ 12,843 $ 409,616 For the Six Months ended June 30, 2020 Segments (in thousands) Index Analytics ESG and Climate All Other - Private Assets Total Revenue Types Recurring subscriptions $ 285,244 $ 250,254 $ 50,809 $ 28,002 $ 614,309 Asset-based fees 188,271 — — — 188,271 Non-recurring 18,649 2,817 726 1,624 23,816 Total $ 492,164 $ 253,071 $ 51,535 $ 29,626 $ 826,396
Schedule of Change in Accounts Receivable and Deferred Revenue	The tables that follow present the change in accounts receivable and in deferred revenue between the dates indicated: Accounts receivable Deferred revenue (in thousands) Opening (December 31, 2020) $ 558,569 $ 675,870 Closing (June 30, 2021) 488,570 662,168 Increase/(decrease) $ (69,999 ) $ (13,702 ) Accounts receivable Deferred revenue (in thousands) Opening (December 31, 2019) $ 499,268 $ 574,656 Closing (June 30, 2020) 466,096 587,113 Increase/(decrease) $ (33,172 ) $ 12,457
Schedule of Remaining Performance Obligations	The remaining performance obligations for contracts that have a duration of greater than one year and the periods in which they are expected to be recognized are as follows: As of June 30, 2021 (in thousands) First 12-month period $ 351,845 Second 12-month period 197,787 Third 12-month period 65,524 Periods thereafter 16,706 Total $ 631,862

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Computation of Basic and Diluted EPS	The following table presents the computation of basic and diluted EPS: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands, except per share data) Net income $ 165,423 $ 115,123 $ 362,242 $ 263,248 Basic weighted average common shares outstanding 82,454 83,666 82,546 84,268 Effect of dilutive securities: Restricted stock units 841 683 847 680 Diluted weighted average common shares outstanding 83,295 84,349 83,393 84,948 Earnings per basic common share $ 2.01 $ 1.38 $ 4.39 $ 3.12 Earnings per diluted common share $ 1.99 $ 1.36 $ 4.34 $ 3.10

Property, Equipment and Lease_2

Property, Equipment and Leasehold Improvements, Net (Tables)	6 Months Ended
	Jun. 30, 2021
Property Plant And Equipment [Abstract]
Schedule of Property, Equipment and Leasehold Improvements, Net	Property, equipment and leasehold improvements, net consisted of the following as of the specified dates: As of June 30, December 31, 2021 2020 (in thousands) Computer & related equipment $ 183,893 $ 186,786 Furniture & fixtures 14,988 15,276 Leasehold improvements 56,085 56,537 Work-in-process 2,810 2,996 Subtotal 257,776 261,595 Accumulated depreciation and amortization (186,344 ) (181,149 ) Property, equipment and leasehold improvements, net $ 71,432 $ 80,446

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, Net (Tables)	6 Months Ended
	Jun. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Goodwill by Reportable Segment	The following table presents goodwill by reportable segment: (in thousands) Index Analytics ESG and Climate All Other - Private Assets Total Goodwill at December 31, 2020 $ 1,205,758 $ 290,976 $ 48,047 $ 21,241 $ 1,566,022 Foreign exchange translation adjustment 365 — — 225 590 Goodwill at June 30, 2021 $ 1,206,123 $ 290,976 $ 48,047 $ 21,466 $ 1,566,612
Schedule of Amortization Expense Related to Intangible Assets by Category	The following table presents the amount of amortization expense related to intangible assets by category for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (in thousands) 2021 2020 2021 2020 Amortization expense of acquired intangible assets $ 8,376 $ 8,607 $ 16,744 $ 17,385 Amortization expense of internally developed capitalized software 6,007 5,455 12,707 10,453 Write-off of internally developed capitalized software 16,013 — 16,013 — Total amortization of intangible assets expense $ 30,396 $ 14,062 $ 45,464 $ 27,838
Schedule of Gross Carrying and Accumulated Amortization Amounts Related to Company's Intangible Assets	The gross carrying and accumulated amortization amounts related to the Company’s intangible assets were as follows: As of June 30, December 31, 2021 2020 (in thousands) Gross intangible assets: Customer relationships $ 356,700 $ 356,700 Trademarks 207,300 207,300 Acquired technology and software 177,720 177,720 Internally developed capitalized software 85,838 113,188 Proprietary data 28,627 28,627 Subtotal 856,185 883,535 Foreign exchange translation adjustment (4,741 ) (5,262 ) Total gross intangible assets $ 851,444 $ 878,273 Accumulated amortization: Customer relationships $ (264,386 ) $ (253,465 ) Trademarks (147,773 ) (143,207 ) Acquired technology and software (174,390 ) (174,032 ) Internally developed capitalized software (39,813 ) (57,464 ) Proprietary data (16,680 ) (15,730 ) Subtotal (643,042 ) (643,898 ) Foreign exchange translation adjustment 71 373 Total accumulated amortization $ (642,971 ) $ (643,525 ) Net intangible assets: Customer relationships $ 92,314 $ 103,235 Trademarks 59,527 64,093 Acquired technology and software 3,330 3,688 Internally developed capitalized software 46,025 55,724 Proprietary data 11,947 12,897 Subtotal 213,143 239,637 Foreign exchange translation adjustment (4,670 ) (4,889 ) Total net intangible assets $ 208,473 $ 234,748
Estimated Amortization Expense for Remainder of 2021 and Succeeding Years	The following table presents the estimated amortization expense for the remainder of the year ending December 31, 2021 and succeeding years: Years Ending December 31, Amortization Expense (in thousands) Remainder of 2021 $ 26,782 2022 51,146 2023 45,359 2024 37,892 2025 21,290 Thereafter 26,004 Total $ 208,473

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Schedule of Senior Unsecured Notes	The Company had an aggregate of $4,000.0 million in senior unsecured notes (collectively, the “Senior Notes”) outstanding at June 30, 2021, as presented in the table below: Principal Amount Outstanding at Carrying Value at Carrying Value at Fair Value at Fair Value at Maturity Date June 30, 2021 June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 (in thousands) Long-term debt 4.75% senior unsecured notes due 2026 August 1, 2026 - - 496,257 - 522,325 5.375% senior unsecured notes due 2027 May 15, 2027 500,000 496,145 495,819 533,825 538,100 4.000% senior unsecured notes due 2029 November 15, 2029 1,000,000 990,910 990,364 1,056,210 1,073,040 3.625% senior unsecured notes due 2030 September 1, 2030 900,000 893,932 395,458 923,022 419,428 3.875% senior unsecured notes due 2031 February 15, 2031 1,000,000 989,426 988,879 1,039,070 1,063,430 3.625% senior unsecured notes due 2031 November 1, 2031 600,000 593,209 - 617,244 - Total long-term debt $ 4,000,000 $ 3,963,622 $ 3,366,777 $ 4,169,371 $ 3,616,323
Schedule of Interest Payments Due Attributable to Senior Notes	Interest payments attributable to the Senior Notes are due as presented in the following table: First semi-annual interest payment date Second semi-annual interest payment date Senior Notes 4.75% senior unsecured notes due 2026 February 1 August 1 5.375% senior unsecured notes due 2027 May 15 November 15 4.000% senior unsecured notes due 2029 May 15 November 15 3.625% senior unsecured notes due 2030 March 1 September 1 3.875% senior unsecured notes due 2031 June 1 December 1 3.625% senior unsecured notes due 2031 May 1 November 1

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Summary of Future Minimum Commitments Under Operating Leases	Future minimum commitments for the Company’s operating leases in place as of June 30, 2021, the interest and other relevant line items in the Unaudited Condensed Consolidated Statement of Financial Condition are as follows: Maturity of Lease Liabilities Operating (in thousands) Leases Remainder of 2021 $ 13,158 2022 26,672 2023 25,535 2024 20,231 2025 19,755 Thereafter 88,328 Total lease payments $ 193,679 Less: Interest (27,017 ) Present value of lease liabilities $ 166,662 Other accrued liabilities $ 21,377 Long-term operating lease liabilities $ 145,285
Summary of Lease Term and Discount Rate Under Operating Leases	Lease term and discount rate for the Company’s operating leases in place as of June 30, 2021 are as follows: As of June 30, Lease Term and Discount Rate 2021 Weighted-average remaining lease term (years) 8.68 Weighted-average discount rate 3.32 %
Summary of Other Information Under Operating Leases	Other information for the Company’s operating leases in place for the six months ended June 30, 2021 are as follows: Six Months Ended Other Information June 30, (in thousands) 2021 2020 Operating cash flows used for operating leases $ 15,239 $ 15,355 Leased assets obtained in exchange for new operating lease liabilities $ 5,074 $ 7,491

Shareholders' Equity (Deficit)

Shareholders' Equity (Deficit) (Tables)	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Schedule of Company's Common Stock Repurchases Made on Open Market	The following table provides information with respect to repurchases of the Company’s common stock made on the open market: Six Months Ended Average Price Paid Per Share Total Number of Shares Repurchased Dollar Value of Shares Repurchased (in thousands) June 30, 2021 $ 407.70 330 $ 134,340 June 30, 2020 $ 250.65 1,423 $ 356,770
Schedule of Dividends Declared Per Common Share and Total Amounts Declared, Distributed and Deferred	The following table presents dividends declared per common share as well as total amounts declared, distributed and deferred for the periods indicated: Dividends (in thousands, except per share amounts) Per Share Declared Distributed (Released)/Deferred 2021 Three Months Ended March 31, $ 0.78 $ 65,947 $ 66,153 $ (206 ) Three Months Ended June 30, 0.78 64,863 64,489 374 Total $ 1.56 $ 130,810 $ 130,642 $ 168 2020 Three Months Ended March 31, $ 0.68 $ 59,233 $ 59,455 $ (222 ) Three Months Ended June 30, 0.68 57,360 57,068 292 Total $ 1.36 $ 116,593 $ 116,523 $ 70
Summary of Activity Related to Shares of Common Stock Issued and Repurchased	The following table presents activity related to shares of common stock issued and repurchased during the six months ended June 30, 2021: Common Stock Treasury Common Stock Issued Stock Outstanding Balance at December 31, 2020 132,829,175 (50,255,768 ) 82,573,407 Dividend payable/paid 160 (48 ) 112 Common stock issued 301,227 — 301,227 Shares withheld for tax withholding — (122,924 ) (122,924 ) Shares repurchased under stock repurchase programs — (329,508 ) (329,508 ) Shares issued to directors — — — Balance at March 31, 2021 133,130,562 (50,708,248 ) 82,422,314 Dividend payable/paid 43 (43 ) — Common stock issued 10,692 — 10,692 Shares withheld for tax withholding — (1,303 ) (1,303 ) Shares repurchased under stock repurchase programs — — — Shares issued to directors 1,308 4,826 6,134 Balance at June 30, 2021 133,142,605 (50,704,768 ) 82,437,837

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Operating Revenues by Reportable Segment	The following table presents operating revenues by reportable segment for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Operating revenues Index $ 305,963 $ 242,908 $ 598,454 $ 492,164 Analytics 135,902 127,563 269,919 253,071 ESG and Climate 39,308 26,302 74,058 51,535 All Other - Private Assets 17,007 12,843 34,172 29,626 Total $ 498,180 $ 409,616 $ 976,603 $ 826,396
Segment Profitability and Reconciliation to Net Income	The following table presents segment profitability and a reconciliation to net income for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Index Adjusted EBITDA $ 233,468 $ 183,256 $ 453,347 $ 366,843 Analytics Adjusted EBITDA 49,814 46,167 95,545 82,484 ESG and Climate Adjusted EBITDA 5,720 5,499 10,765 9,125 All Other - Private Assets Adjusted EBITDA 5,947 1,778 11,878 7,475 Total operating segment profitability 294,949 236,700 571,535 465,927 Amortization of intangible assets 30,396 14,062 45,464 27,838 Depreciation and amortization of property, equipment and leasehold improvements 7,020 7,463 14,163 15,030 Operating income 257,533 215,175 511,908 423,059 Other expense (income), net 61,838 76,008 100,185 121,043 Provision for income taxes 30,272 24,044 49,481 38,768 Net income $ 165,423 $ 115,123 $ 362,242 $ 263,248
Operating Revenues by Geographic Area	Operating revenues by geography are based on the shipping address of the ultimate customer utilizing the product. The following table presents revenue by geographic area for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Operating revenues Americas: United States $ 200,781 $ 175,819 $ 397,470 $ 356,865 Other 21,026 16,891 41,199 34,647 Total Americas 221,807 192,710 438,669 391,512 Europe, the Middle East and Africa ("EMEA"): United Kingdom 84,802 62,826 163,883 127,887 Other 113,258 90,209 219,452 178,138 Total EMEA 198,060 153,035 383,335 306,025 Asia & Australia: Japan 22,993 19,725 44,635 39,117 Other 55,320 44,146 109,964 89,742 Total Asia & Australia 78,313 63,871 154,599 128,859 Total $ 498,180 $ 409,616 $ 976,603 $ 826,396
Long-Lived Assets by Geographic Area	Long-lived assets consist of property, equipment and leasehold improvements, right of use assets and internally developed capitalized software, net of accumulated depreciation and amortization. The following table presents long-lived assets by geographic area on the dates indicated: As of June 30, December 31, 2021 2020 (in thousands) Long-lived assets Americas: United States $ 161,363 $ 182,776 Other 14,739 13,949 Total Americas 176,102 196,725 EMEA: United Kingdom 19,596 19,678 Other 32,720 33,561 Total EMEA 52,316 53,239 Asia & Australia: Japan 1,471 1,896 Other 33,934 37,946 Total Asia & Australia 35,405 39,842 Total $ 263,823 $ 289,806

Introduction and Basis of Pre_4

Introduction and Basis of Presentation - Additional Information (Detail) - Sales Revenue, Services, Net [Member] - Customer Concentration Risk [Member] - Customer	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Introduction And Basis Of Presentation [Line Items]
Number of major customers represented 10.0% or more of operating revenues	1	1
Blackrock Inc [Member]
Introduction And Basis Of Presentation [Line Items]
Percentage of operating revenues accounted for by major customer	12.40%	10.90%
Index [Member] | Blackrock Inc [Member]
Introduction And Basis Of Presentation [Line Items]
Percentage of operating revenues accounted for by major customer	19.80%	17.90%
Analytics [Member]
Introduction And Basis Of Presentation [Line Items]
Number of major customers represented 10.0% or more of operating revenues	0	0
ESG and Climate [Member]
Introduction And Basis Of Presentation [Line Items]
Number of major customers represented 10.0% or more of operating revenues	0	0
All Other – Private Assets [Member]
Introduction And Basis Of Presentation [Line Items]
Number of major customers represented 10.0% or more of operating revenues	0	0

Introduction and Basis of Pre_5

Introduction and Basis of Presentation - Changes in Allowance for Credit Losses on Doubtful Accounts Receivable (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Receivables [Abstract]
Balance at beginning of year	$ 1,583	$ 1,715
Addition (reduction) to credit loss expense	523	1,712
Adjustments and write-offs, net of recoveries	(389)	(1,844)
Balance at ending of year	$ 1,717	$ 1,583

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Operating revenues	$ 498,180	$ 409,616	$ 976,603	$ 826,396
Index [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	305,963	242,908	598,454	492,164
Analytics [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	135,902	127,563	269,919	253,071
ESG and Climate [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	39,308	26,302	74,058	51,535
All Other – Private Assets [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	17,007	12,843	34,172	29,626
Recurring Subscriptions [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	348,130	309,884	685,862	614,309
Recurring Subscriptions [Member] | Index [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	160,061	145,404	315,178	285,244
Recurring Subscriptions [Member] | Analytics [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	133,368	126,189	265,040	250,254
Recurring Subscriptions [Member] | ESG and Climate [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	38,567	25,908	72,707	50,809
Recurring Subscriptions [Member] | All Other – Private Assets [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	16,134	12,383	32,937	28,002
Asset-based Fees [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	136,142	88,075	262,848	188,271
Asset-based Fees [Member] | Index [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	136,142	88,075	262,848	188,271
Non-recurring [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	13,908	11,657	27,893	23,816
Non-recurring [Member] | Index [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	9,760	9,429	20,428	18,649
Non-recurring [Member] | Analytics [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	2,534	1,374	4,879	2,817
Non-recurring [Member] | ESG and Climate [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	741	394	1,351	726
Non-recurring [Member] | All Other – Private Assets [Member]
Disaggregation Of Revenue [Line Items]
Operating revenues	$ 873	$ 460	$ 1,235	$ 1,624

Revenue Recognition - Schedule

Revenue Recognition - Schedule of Change in Accounts Receivable and Deferred Revenue (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Revenue From Contract With Customer [Abstract]
Accounts receivable, balance	$ 488,570	$ 466,096	$ 558,569	$ 499,268
Accounts receivable, Increase/(decrease)	(69,999)	(33,172)
Deferred revenue	662,168	587,113	$ 675,870	$ 574,656
Deferred revenue, Increase/(decrease)	$ (13,702)	$ 12,457

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue From Contract With Customer [Abstract]
Revenue recognized during period included in deferred revenue	$ 208.3	$ 173.3	$ 478.6	$ 385.6
Revenue, performance obligations and revenue recognition, description			For contracts that have a duration of one year or less, the Company has not disclosed either the remaining performance obligation as of the end of the reporting period or when the Company expects to recognize the revenue.

Revenue Recognition - Schedul_2

Revenue Recognition - Schedule of Remaining Performance Obligations (Detail) $ in Thousands	Jun. 30, 2021USD ($)
Revenue Recognition [Line Items]
Remaining performance obligations	$ 631,862
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-07-01
Revenue Recognition [Line Items]
Remaining performance obligations	351,845
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-07-01
Revenue Recognition [Line Items]
Remaining performance obligations	197,787
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-07-01
Revenue Recognition [Line Items]
Remaining performance obligations	65,524
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-07-01
Revenue Recognition [Line Items]
Remaining performance obligations	$ 16,706

Revenue Recognition - Schedul_3

Revenue Recognition - Schedule of Remaining Performance Obligations (Detail 1) $ in Thousands	Jun. 30, 2021USD ($)
Revenue From Contract With Customer [Abstract]
Remaining performance obligations	$ 631,862

Revenue Recognition - Schedul_4

Revenue Recognition - Schedule of Remaining Performance Obligations (Parenthetical) (Detail)	Jun. 30, 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-07-01
Revenue Recognition [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-07-01
Revenue Recognition [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-07-01
Revenue Recognition [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-07-01
Revenue Recognition [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

Earnings Per Common Share - Com

Earnings Per Common Share - Computation of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 165,423	$ 196,819	$ 115,123	$ 148,125	$ 362,242	$ 263,248
Basic weighted average common shares outstanding	82,454		83,666		82,546	84,268
Effect of dilutive securities:
Restricted stock units	841		683		847	680
Diluted weighted average common shares outstanding	83,295		84,349		83,393	84,948
Earnings per basic common share	$ 2.01		$ 1.38		$ 4.39	$ 3.12
Earnings per diluted common share	$ 1.99		$ 1.36		$ 4.34	$ 3.10

Property, Equipment and Lease_3

Property, Equipment and Leasehold Improvements, Net - Schedule of Property, Equipment and Leasehold Improvements, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Property Plant And Equipment [Abstract]
Computer & related equipment	$ 183,893	$ 186,786
Furniture & fixtures	14,988	15,276
Leasehold improvements	56,085	56,537
Work-in-process	2,810	2,996
Subtotal	257,776	261,595
Accumulated depreciation and amortization	(186,344)	(181,149)
Property, equipment and leasehold improvements, net	$ 71,432	$ 80,446

Property, Equipment and Lease_4

Property, Equipment and Leasehold Improvements, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Property Plant And Equipment [Abstract]
Depreciation and amortization of property, equipment and leasehold improvements	$ 7,020	$ 7,463	$ 14,163	$ 15,030

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets, Net - Schedule of Goodwill by Reportable Segment (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)
Goodwill [Line Items]
Goodwill, Beginning balance	$ 1,566,022
Foreign exchange translation adjustment	590
Goodwill, Ending balance	1,566,612
Index [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	1,205,758
Foreign exchange translation adjustment	365
Goodwill, Ending balance	1,206,123
Analytics [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	290,976
Goodwill, Ending balance	290,976
ESG and Climate [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	48,047
Goodwill, Ending balance	48,047
All Other – Private Assets [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	21,241
Foreign exchange translation adjustment	225
Goodwill, Ending balance	$ 21,466

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets, Net - Schedule of Amortization Expense Related to Intangible Assets by Category (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 30,396	$ 14,062	$ 45,464	$ 27,838
Acquired Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	8,376	8,607	16,744	17,385
Capitalized Software [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	6,007	$ 5,455	12,707	$ 10,453
Write Off of Internally Developed Capitalized Software [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 16,013		$ 16,013

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Goodwill [Line Items]
Amortization of intangible assets	$ 30,396	$ 14,062	$ 45,464	$ 27,838
Gross intangible assets	851,444		851,444		$ 878,273
Accumulated amortization	642,971		642,971		$ 643,525
Write Off of Internally Developed Capitalized Software [Member]
Goodwill [Line Items]
Amortization of intangible assets	16,013		16,013
Gross intangible assets	46,300		46,300
Accumulated amortization	$ 30,300		$ 30,300

Goodwill and Intangible Asset_6

Goodwill and Intangible Assets, Net - Schedule of Gross Carrying and Accumulated Amortization Amounts Related to Company's Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying value excluding foreign exchange translation adjustment	$ 856,185	$ 883,535
Foreign exchange translation adjustment	(4,741)	(5,262)
Gross carrying value	851,444	878,273
Accumulated amortization excluding foreign exchange translation adjustment	(643,042)	(643,898)
Foreign exchange translation adjustment	71	373
Accumulated amortization	(642,971)	(643,525)
Net carrying value excluding foreign exchange translation adjustment	213,143	239,637
Foreign exchange translation adjustment	(4,670)	(4,889)
Net carrying value	208,473	234,748
Customer Relationships [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying value excluding foreign exchange translation adjustment	356,700	356,700
Accumulated amortization excluding foreign exchange translation adjustment	(264,386)	(253,465)
Net carrying value excluding foreign exchange translation adjustment	92,314	103,235
Trademarks [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying value excluding foreign exchange translation adjustment	207,300	207,300
Accumulated amortization excluding foreign exchange translation adjustment	(147,773)	(143,207)
Net carrying value excluding foreign exchange translation adjustment	59,527	64,093
Acquired Technology and Software [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying value excluding foreign exchange translation adjustment	177,720	177,720
Accumulated amortization excluding foreign exchange translation adjustment	(174,390)	(174,032)
Net carrying value excluding foreign exchange translation adjustment	3,330	3,688
Capitalized Software [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying value excluding foreign exchange translation adjustment	85,838	113,188
Accumulated amortization excluding foreign exchange translation adjustment	(39,813)	(57,464)
Net carrying value excluding foreign exchange translation adjustment	46,025	55,724
Proprietary Data [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying value excluding foreign exchange translation adjustment	28,627	28,627
Accumulated amortization excluding foreign exchange translation adjustment	(16,680)	(15,730)
Net carrying value excluding foreign exchange translation adjustment	$ 11,947	$ 12,897

Goodwill and Intangible Asset_7

Goodwill and Intangible Assets, Net - Estimated Amortization Expense for Remainder of 2021 and Succeeding Years (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2021	$ 26,782
2022	51,146
2023	45,359
2024	37,892
2025	21,290
Thereafter	26,004
Net carrying value	$ 208,473	$ 234,748

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($)	May 14, 2021	Mar. 29, 2021	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020	Nov. 30, 2024	Mar. 31, 2021	Mar. 26, 2021	Mar. 04, 2020
Schedule Of Commitments And Contingencies [Line Items]
Debt instrument principal amount			$ 4,000,000,000	$ 4,000,000,000
Redemption date			Apr. 12, 2021
Loss on extinguishment of debt				21,792,000	$ 44,930,000
Prepaid and Other Assets [Member]
Schedule Of Commitments And Contingencies [Line Items]
Deferred financing fees and premium remain unamortized			$ 500,000	500,000
Other Non-Current Assets [Member]
Schedule Of Commitments And Contingencies [Line Items]
Deferred financing fees and premium remain unamortized			1,800,000	1,800,000
Long-term Debt [Member]
Schedule Of Commitments And Contingencies [Line Items]
Deferred financing fees and premium remain unamortized			36,300,000	36,300,000
Revolving Credit Agreement [Member]
Schedule Of Commitments And Contingencies [Line Items]
Revolving credit facility, maximum borrowing		$ 500,000,000
Revolving credit facility, increase in aggregate commitments		$ 100,000,000
Revolving Credit Agreement [Member] | Scenario Forecast [Member]
Schedule Of Commitments And Contingencies [Line Items]
Revolving credit facility, maximum borrowing						$ 467,500,000
3.625% Senior Unsecured Notes Due 2030 [Member]
Schedule Of Commitments And Contingencies [Line Items]
Debt instrument principal amount			$ 900,000,000	$ 900,000,000				$ 500,000,000	$ 400,000,000
Debt instrument interest rate			3.625%	3.625%				3.625%	3.625%
Maturity date				Sep. 1, 2030
Redemption description				At any time prior to March 1, 2025, the Company may redeem all or part of the 2030 Senior Notes at a redemption price equal to the sum of (i) 100% of the principal amount thereof, plus (ii) a make-whole premium as of the date of redemption, plus (iii) accrued and unpaid interest and additional interest, if any, thereon, to the date of redemption.
Redemption price				103.625%
3.625% Senior Unsecured Notes Due 2030 [Member] | Maximum [Member]
Schedule Of Commitments And Contingencies [Line Items]
Percentage of aggregate principal amount redeemed				35.00%
4.75% Senior Unsecured Notes Due 2026 [Member]
Schedule Of Commitments And Contingencies [Line Items]
Debt instrument principal amount							$ 500,000,000
Debt instrument interest rate			4.75%	4.75%			4.75%
Maturity date				Aug. 1, 2026
4.75% Senior Unsecured Notes Due 2026 [Member] | Other expense (income) [Member]
Schedule Of Commitments And Contingencies [Line Items]
Loss on extinguishment of debt			$ 21,800,000
Write-off of unamortized debt issuance costs			3,600,000
4.75% Senior Unsecured Notes Due 2026 [Member] | Other expense (income) [Member] | Indenture [Member]
Schedule Of Commitments And Contingencies [Line Items]
Loss on debt extinguishment includes applicable premium and redemption price			18,200,000
3.625% Senior Unsecured Notes Due 2031 [Member]
Schedule Of Commitments And Contingencies [Line Items]
Debt instrument principal amount	$ 600,000,000		$ 600,000,000	$ 600,000,000
Debt instrument interest rate	3.625%		3.625%	3.625%
Redemption date	Nov. 1, 2026
Maturity date				Nov. 1, 2031
Redemption description				At any time prior to November 1, 2026, the Company may redeem all or part of the 2031 Senior Notes at a redemption price equal to the sum of (i) 100% of the principal amount thereof, plus (ii) a make-whole premium as of the date of redemption, plus (iii) accrued and unpaid interest, if any, thereon, to the date of redemption.
Redemption price				103.625%
3.625% Senior Unsecured Notes Due 2031 [Member] | Maximum [Member]
Schedule Of Commitments And Contingencies [Line Items]
Percentage of aggregate principal amount redeemed				35.00%
Senior Unsecured Notes [Member]
Schedule Of Commitments And Contingencies [Line Items]
Debt instrument principal amount			$ 4,000,000,000	$ 4,000,000,000
Senior Notes and Revolving Credit Facility [Member]
Schedule Of Commitments And Contingencies [Line Items]
Deferred financing fees and premium remain unamortized			$ 38,600,000	$ 38,600,000

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Senior Unsecured Notes (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2021	May 14, 2021	Mar. 31, 2021	Mar. 26, 2021	Dec. 31, 2020	Mar. 04, 2020
Debt Instrument [Line Items]
Principal Amount Outstanding	$ 4,000,000,000
Carrying Value	3,963,622,000				$ 3,366,777,000
Fair Value	$ 4,169,371,000				3,616,323,000
4.75% Senior Unsecured Notes Due 2026 [Member]
Debt Instrument [Line Items]
Maturity Date	Aug. 1, 2026
Principal Amount Outstanding			$ 500,000,000
Carrying Value					496,257,000
Fair Value					522,325,000
5.375% Senior Unsecured Notes Due 2027 [Member]
Debt Instrument [Line Items]
Maturity Date	May 15, 2027
Principal Amount Outstanding	$ 500,000,000
Carrying Value	496,145,000				495,819,000
Fair Value	$ 533,825,000				538,100,000
4.000% Senior Unsecured Notes Due 2029 [Member]
Debt Instrument [Line Items]
Maturity Date	Nov. 15, 2029
Principal Amount Outstanding	$ 1,000,000,000
Carrying Value	990,910,000				990,364,000
Fair Value	$ 1,056,210,000				1,073,040,000
3.625% Senior Unsecured Notes Due 2030 [Member]
Debt Instrument [Line Items]
Maturity Date	Sep. 1, 2030
Principal Amount Outstanding	$ 900,000,000			$ 500,000,000		$ 400,000,000
Carrying Value	893,932,000				395,458,000
Fair Value	$ 923,022,000				419,428,000
3.875% Senior Unsecured Notes Due 2031 [Member]
Debt Instrument [Line Items]
Maturity Date	Feb. 15, 2031
Principal Amount Outstanding	$ 1,000,000,000
Carrying Value	989,426,000				988,879,000
Fair Value	$ 1,039,070,000				$ 1,063,430,000
3.625% Senior Unsecured Notes Due 2031 [Member]
Debt Instrument [Line Items]
Maturity Date	Nov. 1, 2031
Principal Amount Outstanding	$ 600,000,000	$ 600,000,000
Carrying Value	593,209,000
Fair Value	$ 617,244,000

Commitments and Contingencies_3

Commitments and Contingencies - Schedule of Senior Unsecured Notes (Parenthetical) (Detail)	Jun. 30, 2021	May 14, 2021	Mar. 31, 2021	Mar. 26, 2021	Mar. 04, 2020
4.75% Senior Unsecured Notes Due 2026 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	4.75%		4.75%
5.375% Senior Unsecured Notes Due 2027 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	5.375%
4.000% Senior Unsecured Notes Due 2029 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	4.00%
3.625% Senior Unsecured Notes Due 2030 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	3.625%			3.625%	3.625%
3.875% Senior Unsecured Notes Due 2031 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	3.875%
3.625% Senior Unsecured Notes Due 2031 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	3.625%	3.625%

Commitments and Contingencies_4

Commitments and Contingencies - Schedule of Interest Payments Due Attributable to Senior Notes (Detail)	6 Months Ended
	Jun. 30, 2021
4.75% Senior Unsecured Notes Due 2026 [Member]
Debt Instrument [Line Items]
First semi-annual interest payment date	--02-01
Second semi-annual interest payment date	--08-01
5.375% Senior Unsecured Notes Due 2027 [Member]
Debt Instrument [Line Items]
First semi-annual interest payment date	--05-15
Second semi-annual interest payment date	--11-15
4.000% Senior Unsecured Notes Due 2029 [Member]
Debt Instrument [Line Items]
First semi-annual interest payment date	--05-15
Second semi-annual interest payment date	--11-15
3.625% Senior Unsecured Notes Due 2030 [Member]
Debt Instrument [Line Items]
First semi-annual interest payment date	--03-01
Second semi-annual interest payment date	--09-01
3.875% Senior Unsecured Notes Due 2031 [Member]
Debt Instrument [Line Items]
First semi-annual interest payment date	--06-01
Second semi-annual interest payment date	--12-01
3.625% Senior Unsecured Notes Due 2031 [Member]
Debt Instrument [Line Items]
First semi-annual interest payment date	--05-01
Second semi-annual interest payment date	--11-01

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Operating lease, expense	$ 7.5	$ 8.9	$ 15.1	$ 17.8

Leases - Summary of Future Mini

Leases - Summary of Future Minimum Commitments Under Operating Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Maturity of Lease Liabilities
Remainder of 2021	$ 13,158
2022	26,672
2023	25,535
2024	20,231
2025	19,755
Thereafter	88,328
Total lease payments	193,679
Less: Interest	(27,017)
Present value of lease liabilities	166,662
Other accrued liabilities	$ 21,377
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other accrued liabilities
Long-term operating lease liabilities	$ 145,285	$ 152,342

Leases - Summary of Lease Term

Leases - Summary of Lease Term and Discount Rate Under Operating Lease (Detail)	Jun. 30, 2021
Leases [Abstract]
Weighted-average remaining lease term (years)	8 years 8 months 4 days
Weighted-average discount rate	3.32%

Leases - Summary of Other Infor

Leases - Summary of Other Information Under Operating Lease (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Operating cash flows used for operating leases	$ 15,239	$ 15,355
Leased assets obtained in exchange for new operating lease liabilities	$ 5,074	$ 7,491

Shareholders' Equity (Deficit_2

Shareholders' Equity (Deficit) - Additional Information (Detail) - USD ($)	Jun. 30, 2021	Oct. 29, 2020
2020 Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchase program authorizing the purchase of shares		$ 1,000,000,000
Stock repurchase program, remaining authorized repurchase amount	$ 1,594,400,000	1,804,500,000
2019 Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, remaining authorized repurchase amount		$ 804,500,000

Shareholders' Equity (Deficit_3

Shareholders' Equity (Deficit) - Schedule of Company's Common Stock Repurchases Made on Open Market (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Equity, Class of Treasury Stock [Line Items]
Dollar Value of Shares Repurchased	$ 134,340	$ 31,071	$ 325,699
Open Market Purchases of Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Average Price Paid Per Share				$ 407.70	$ 250.65
Total Number of Shares Repurchased				330	1,423
Dollar Value of Shares Repurchased				$ 134,340	$ 356,770

Shareholders' Equity (Deficit_4

Shareholders' Equity (Deficit) - Schedule of Dividends Declared Per Common Share and Total Amounts Declared, Distributed and Deferred (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Stockholders Equity [Abstract]
Dividend declared per common share	$ 0.78	$ 0.78	$ 0.68	$ 0.68	$ 1.56	$ 1.36
Cash dividends declared, Amount	$ 64,863	$ 65,947	$ 57,360	$ 59,233	$ 130,810	$ 116,593
Cash dividends distributed, Amount	64,489	66,153	57,068	59,455	130,642	116,523
Cash dividends (released)/deferred, Amount	$ 374	$ (206)	$ 292	$ (222)	$ 168	$ 70

Shareholders' Equity (Deficit_5

Shareholders' Equity (Deficit) - Summary of Activity Related to Shares of Common Stock Issued and Repurchased (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021
Common Stock Issued [Member]
Common Stock Outstanding [Line Items]
Beginning balance	133,130,562	132,829,175	132,829,175
Dividend payable/paid	43	160
Common stock issued	10,692	301,227
Shares issued to directors	1,308
Ending balance	133,142,605	133,130,562	133,142,605
Treasury Stock [Member]
Common Stock Outstanding [Line Items]
Beginning balance	(50,708,248)	(50,255,768)	(50,255,768)
Dividend payable/paid	(43)	(48)
Shares withheld for tax withholding	(1,303)	(122,924)
Shares repurchased under stock repurchase programs		(329,508)
Shares issued to directors	4,826
Ending balance	(50,704,768)	(50,708,248)	(50,704,768)
Common Stock Outstanding [Member]
Common Stock Outstanding [Line Items]
Beginning balance	82,422,314	82,573,407	82,573,407
Dividend payable/paid		112
Common stock issued	10,692	301,227
Shares withheld for tax withholding	(1,303)	(122,924)
Shares repurchased under stock repurchase programs		(329,508)
Shares issued to directors	6,134
Ending balance	82,437,837	82,422,314	82,437,837

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Examination [Line Items]
Provision for income taxes	$ 30,272	$ 24,044	$ 49,481	$ 38,768
Effective tax rate			12.00%	12.80%
Amounts effect on effective tax rate	$ 34,200	$ 34,100	$ 34,200	$ 34,100
Amount of excess tax benefits recognized on share-based compensation vested			21,400	21,500
Tax Impact of loss on debt extinguishment			5,600	11,500
Benefit related to revaluation of cost of deemed repatriation of foreign earnings				$ 800
Tax benefit related to revaluation of deferred tax assets			2,300
Tax benefit from filing of prior year refund claims			2,100
Tax benefit from other prior year earnings			2,800
Decrease in unrecognized tax benefit			30,000
Increase in unrecognized tax benefit			$ 15,500
Minimum [Member]
Income Tax Examination [Line Items]
Tax years under examination			2008
Maximum [Member]
Income Tax Examination [Line Items]
Tax years under examination			2020

Segment Information - Additiona

Segment Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2021SegmentReporting_unit
Segment Reporting [Abstract]
Number of operating segments | Segment	5
Number of reportable segments | Reporting_unit	4

Segment Information - Operating

Segment Information - Operating Revenues by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	$ 498,180	$ 409,616	$ 976,603	$ 826,396
Index [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	305,963	242,908	598,454	492,164
Analytics [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	135,902	127,563	269,919	253,071
ESG and Climate [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	39,308	26,302	74,058	51,535
All Other – Private Assets [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	$ 17,007	$ 12,843	$ 34,172	$ 29,626

Segment Information - Segment P

Segment Information - Segment Profitability and Reconciliation to Net Income (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 294,949		$ 236,700		$ 571,535	$ 465,927
Amortization of intangible assets	30,396		14,062		45,464	27,838
Depreciation and amortization of property, equipment and leasehold improvements	7,020		7,463		14,163	15,030
Operating income	257,533		215,175		511,908	423,059
Other expense (income), net	61,838		76,008		100,185	121,043
Provision for income taxes	30,272		24,044		49,481	38,768
Net income	165,423	$ 196,819	115,123	$ 148,125	362,242	263,248
Index [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	233,468		183,256		453,347	366,843
Analytics [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	49,814		46,167		95,545	82,484
ESG and Climate [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	5,720		5,499		10,765	9,125
All Other – Private Assets [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 5,947		$ 1,778		$ 11,878	$ 7,475

Segment Information - Operati_2

Segment Information - Operating Revenues by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenues	$ 498,180	$ 409,616	$ 976,603	$ 826,396
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenues	200,781	175,819	397,470	356,865
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenues	21,026	16,891	41,199	34,647
Total Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenues	221,807	192,710	438,669	391,512
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenues	84,802	62,826	163,883	127,887
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenues	113,258	90,209	219,452	178,138
Europe, the Middle East and Africa ("EMEA") [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenues	198,060	153,035	383,335	306,025
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenues	22,993	19,725	44,635	39,117
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenues	55,320	44,146	109,964	89,742
Total Asia & Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenues	$ 78,313	$ 63,871	$ 154,599	$ 128,859

Segment Information - Long-Live

Segment Information - Long-Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 263,823	$ 289,806
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	161,363	182,776
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	14,739	13,949
Total Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	176,102	196,725
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	19,596	19,678
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	32,720	33,561
Total EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	52,316	53,239
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	1,471	1,896
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	33,934	37,946
Total Asia & Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 35,405	$ 39,842

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - $ / shares	Jul. 26, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Subsequent Event [Line Items]
Quarterly dividend declared		$ 0.78	$ 0.78	$ 0.68	$ 0.68	$ 1.56	$ 1.36
Subsequent Event [Member]
Subsequent Event [Line Items]
Quarterly dividend declared	$ 1.04
Quarterly dividend declared date	Jul. 26, 2021
Quarterly dividend payable date	Aug. 31, 2021
Quarterly dividend record date	Aug. 13, 2021