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INVESTMENTS - Schedule of investments and Other Equity Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Schedule of Cost and Equity Method Investments    
Total equity method investments $ 231.9 $ 215.4
Total other equity investments 37.8 37.8
Total investments 269.7 253.2
7Ridge Fund    
Schedule of Cost and Equity Method Investments    
Total equity method investments 231.9 215.4
Investment in Eris Exchange Holdings, LLC    
Schedule of Cost and Equity Method Investments    
Total other equity investments 20.0 20.0
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 Effective Investing Limited    
Schedule of Cost and Equity Method Investments    
Total other equity investments 1.8 1.8
Investment in OCC    
Schedule of Cost and Equity Method Investments    
Total other equity investments $ 0.3 0.3
Investment percentage 20.00%  
Other equity investments    
Schedule of Cost and Equity Method Investments    
Total other equity investments $ 1.9 $ 1.9