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INVESTMENTS - Schedule of investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Schedule of Cost and Equity Method Investments      
Total equity method investments $ 207.6 $ 207.6 $ 209.5
Total other equity investments 35.9 35.9 36.3
Total investments 243.5 243.5 245.8
Investment in 7Ridge Investments 3 LP      
Schedule of Cost and Equity Method Investments      
Total equity method investments 207.6 207.6 209.5
Investment in Eris Exchange Holdings, LLC      
Schedule of Cost and Equity Method Investments      
Total other equity investments 20.0 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 2.9
Investment in OCC      
Schedule of Cost and Equity Method Investments      
Total other equity investments 0.3 $ 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
Impairment charge 10.6    
Investment in Eris Digital Holdings, LLC      
Schedule of Cost and Equity Method Investments      
Total other equity investments     1.1
Other equity investments      
Schedule of Cost and Equity Method Investments      
Total other equity investments $ 1.8 $ 1.8 $ 1.4