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INVESTMENTS - Schedule of investments and Other Equity Investments (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
May 31, 2020
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Schedule of Cost and Equity Method Investments          
Total equity method investments   $ 215.4     $ 209.5
Total other equity investments   37.8     36.3
Total investments   253.2     245.8
Investment in 7Ridge Investments 3 LP          
Schedule of Cost and Equity Method Investments          
Total equity method investments   215.4     209.5
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%      
Investment in American Financial Exchange, LLC          
Schedule of Cost and Equity Method Investments          
Total other equity investments         10.6
Investment in Eris Digital Holdings, LLC          
Schedule of Cost and Equity Method Investments          
Total other equity investments         1.1
Recognized gain or loss on restructuring $ 0.0        
Other equity investments          
Schedule of Cost and Equity Method Investments          
Total other equity investments   $ 1.9     $ 1.4
StratiFi Technologies          
Schedule of Cost and Equity Method Investments          
Total other equity investments   $ 0.1