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INVESTMENTS - Schedule of investments and Other Equity Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Schedule of Cost and Equity Method Investments    
Total equity method investments $ 307.5 $ 292.0
Total other equity investments 54.3 53.3
Total investments 361.8 345.3
7Ridge Fund    
Schedule of Cost and Equity Method Investments    
Total equity method investments 307.5 292.0
Investment in Eris Innovations Holdings, LLC    
Schedule of Cost and Equity Method Investments    
Total other equity investments 20.0 20.0
Investment in Globacap Technology Limited    
Schedule of Cost and Equity Method Investments    
Total other equity investments 16.0 16.0
Investment in CSD Br    
Schedule of Cost and Equity Method Investments    
Total other equity investments 5.9 5.9
Investment in Coin Metrics Inc.    
Schedule of Cost and Equity Method Investments    
Total other equity investments 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
Investment in OCC    
Schedule of Cost and Equity Method Investments    
Total other equity investments 0.3 0.3
Other equity investments    
Schedule of Cost and Equity Method Investments    
Total other equity investments $ 4.2 $ 3.2