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ACQUISITIONS (Details) - USD ($)
$ in Millions
12 Months Ended
May 02, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Acquisitions        
Goodwill     $ 592.5  
Acquisition-related costs   $ 7.4 19.9 $ 15.6
Professional fees   92.0 89.0 83.7
Acquisitions        
Acquisitions        
Acquisition-related costs   $ 7.4 $ 19.9 15.6
Professional fees       15.0
Impairment facilities charges       $ 0.6
Cboe Digital        
Acquisitions        
Goodwill $ 460.9      
Intangible assets 95.0      
Working capital 8.4      
Gain on change in fair value $ 7.5