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INVESTMENTS - Schedule of investments and Other Equity Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Schedule of Cost and Equity Method Investments      
Total equity method investments $ 321.3 $ 321.3 $ 292.0
Total other equity investments 38.2 38.2 53.3
Total investments 359.5 359.5 345.3
Impairment of minority investment   16.0  
7Ridge Fund      
Schedule of Cost and Equity Method Investments      
Total equity method investments 321.3 321.3 292.0
Investment in Eris Innovations Holdings, LLC      
Schedule of Cost and Equity Method Investments      
Total other equity investments 20.0 20.0 20.0
Investment in Globacap Technology Limited      
Schedule of Cost and Equity Method Investments      
Total other equity investments     16.0
Investment in CSD Br      
Schedule of Cost and Equity Method Investments      
Total other equity investments 5.9 5.9 5.9
Investment in Coin Metrics Inc.      
Schedule of Cost and Equity Method Investments      
Total other equity investments 5.0 5.0 5.0
Investment in Cboe Vest Financial Group, Inc.      
Schedule of Cost and Equity Method Investments      
Total other equity investments 2.9 2.9 2.9
Investment in OCC      
Schedule of Cost and Equity Method Investments      
Total other equity investments 0.3 0.3 0.3
Other equity investments      
Schedule of Cost and Equity Method Investments      
Total other equity investments 4.1 $ 4.1 $ 3.2
Globacap Technology Limited      
Schedule of Cost and Equity Method Investments      
Impairment of minority investment $ 16.0