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Long-term Investments	12 Months Ended
Long-term Investments	Dec. 31, 2024
Long-Term Investments [Abstract]
Long-term Investments	7. LONG-TERM INVESTMENTS The company maintains various long-term investments as described below. The investments are recorded in other assets on the consolidated balance sheets. GME Holdings Limited. The company owns a 33% interest in GME Holdings Limited (GME Holdings), and accounts for its investment in GME Holdings using the equity method of accounting. Dubai Mercantile Exchange (DME) was rebranded as the Gulf Mercantile Exchange (GME) in 2024 to reflect its position as the key regional commodities exchange in the Middle East. In June 2024, the company invested $3.5 million in GME Holdings in exchange for 3.5 million additional shares of GME. This transaction was immediately followed by a secondary share sale to a third party of 15.5 million shares for $15.5 million, which ultimately reduced our stake in GME Holdings from 50% to 33%. The company recognized a net gain of $9.2 million on the transaction as recorded in other non-operating income on the consolidated statements of income during 2024. The carrying amount of the company's investment in GME Holdings was $11.6 million at December 31, 2024. The company and GME Holdings maintain an agreement for Gulf Mercantile Exchange futures contracts to be exclusively traded on the CME Globex platform. OSTTRA. The company owns a 50% equity interest in OSTTRA, which is a joint venture withe IHS Markit. OSTTRA performs trade processing and risk mitigation services. The company accounts for its investment using the equity method of accounting. The carrying amount of the company's investment in OSTTRA was $1.2 billion at December 31, 2024. S&P Dow Jones Indices LLC. In June 2022, the company invested $410.0 million in S&P Dow Jones Indices LLC, which S&P Dow Jones Indices LLC used as part of the consideration for its acquisition of the IHS Markit index business. The company continues to own a 27% interest in S&P Dow Jones Indices LLC and accounts for its investment in S&P Dow Jones Indices LLC using the equity method of accounting. The carrying amount of the company's investment in S&P Dow Jones Indices LLC was $1.3 billion at December 31, 2024. The company has long-term exclusive licensing agreements with S&P Dow Jones Indices LLC to list products based on the Standard & Poor's Indices and Dow Jones Indices. Shanghai CFETS-NEX International Money Broking Co., Ltd. The company owns a 33% interest in Shanghai CFETS-NEX International Money Broking Co., Ltd. (CFETS) and accounts for its investment in CFETS using the equity method of accounting. The carrying amount of the company's investment in CFETS was $58.4 million at December 31, 2024.