Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

REVENUE RECOGNITION - Schedule of Disaggregation of Operating Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation Of Revenue [Line Items]
Operating revenues	$ 724,705	$ 625,439	$ 2,112,619	$ 1,838,814
Index
Disaggregation Of Revenue [Line Items]
Operating revenues	404,882	362,122	1,175,946	1,063,820
Analytics
Disaggregation Of Revenue [Line Items]
Operating revenues	172,376	154,268	502,337	451,219
ESG and Climate
Disaggregation Of Revenue [Line Items]
Operating revenues	83,643	73,038	241,382	211,315
All Other - Private Assets
Disaggregation Of Revenue [Line Items]
Operating revenues	63,804	36,011	192,954	112,460
Recurring subscriptions
Disaggregation Of Revenue [Line Items]
Operating revenues	536,622	464,997	1,571,146	1,365,936
Recurring subscriptions \| Index
Disaggregation Of Revenue [Line Items]
Operating revenues	223,945	206,453	653,929	603,845
Recurring subscriptions \| Analytics
Disaggregation Of Revenue [Line Items]
Operating revenues	168,150	151,269	490,829	443,276
Recurring subscriptions \| ESG and Climate
Disaggregation Of Revenue [Line Items]
Operating revenues	81,536	71,744	235,954	207,523
Recurring subscriptions \| All Other - Private Assets
Disaggregation Of Revenue [Line Items]
Operating revenues	62,991	35,531	190,434	111,292
Asset-based fees
Disaggregation Of Revenue [Line Items]
Operating revenues	168,622	141,066	482,162	412,354
Asset-based fees \| Index
Disaggregation Of Revenue [Line Items]
Operating revenues	168,622	141,066	482,162	412,354
Asset-based fees \| Analytics
Disaggregation Of Revenue [Line Items]
Operating revenues	0	0	0	0
Asset-based fees \| ESG and Climate
Disaggregation Of Revenue [Line Items]
Operating revenues	0	0	0	0
Asset-based fees \| All Other - Private Assets
Disaggregation Of Revenue [Line Items]
Operating revenues	0	0	0	0
Non-recurring
Disaggregation Of Revenue [Line Items]
Operating revenues	19,461	19,376	59,311	60,524
Non-recurring \| Index
Disaggregation Of Revenue [Line Items]
Operating revenues	12,315	14,603	39,855	47,621
Non-recurring \| Analytics
Disaggregation Of Revenue [Line Items]
Operating revenues	4,226	2,999	11,508	7,943
Non-recurring \| ESG and Climate
Disaggregation Of Revenue [Line Items]
Operating revenues	2,107	1,294	5,428	3,792
Non-recurring \| All Other - Private Assets
Disaggregation Of Revenue [Line Items]
Operating revenues	$ 813	$ 480	$ 2,520	$ 1,168