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INVESTMENTS - Schedule of investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Schedule of Cost and Equity Method Investments    
Total equity method investments $ 208.2 $ 209.5
Total other equity investments 36.3 36.3
Total investments 244.5 245.8
Investment in 7Ridge Investments 3 LP    
Schedule of Cost and Equity Method Investments    
Total equity method investments 208.2 209.5
Investment in Eris Exchange Holdings, LLC    
Schedule of Cost and Equity Method Investments    
Total other equity investments 20.0 20.0
Investment in American Financial Exchange, LLC    
Schedule of Cost and Equity Method Investments    
Total other equity investments 10.6 10.6
Investment in Cboe Vest Financial Group, Inc.    
Schedule of Cost and Equity Method Investments    
Total other equity investments 2.9 2.9
Investment in Eris Digital Holdings, LLC    
Schedule of Cost and Equity Method Investments    
Total other equity investments 1.1 1.1
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 $ 1.4 $ 1.4