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Subsequent Events (Notes)	3 Months Ended
	Mar. 31, 2025
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Events The company has evaluated subsequent events through the date the financial statements were issued. On April 14, 2025, S&P Global and CME Group announced the signing of a definitive agreement to sell OSTTRA, our 50% equity method investment, to investment funds managed by KKR & Co. Inc. OSTTRA is a provider of post-trade solutions for the OTC market. The carrying amount of the company's investment in OSTTRA was $1.2 billion including approximately $100.0 million of accumulated foreign currency translation adjustments at March 31, 2025. The terms of the deal for OSTTRA equaled total enterprise value at $3.1 billion, subject to customary purchase price adjustments, which will be divided evenly between S&P Global and CME Group pursuant to the 50/50 joint venture. The transaction is expected to close in the second half of 2025, subject to customary closing conditions and receipt of required regulatory approvals.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/855/tableOfContent

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
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-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

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