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ACQUISITIONS - Cboe Canada (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Jun. 01, 2022
Dec. 31, 2023
Dec. 31, 2022
Acquisitions        
Goodwill       $ 592.5
Contingent consideration $ (11.8)   $ (11.8) (39.1)
Goodwill, Total adjustments       $ 4.4
Cboe Canada        
Acquisitions        
Goodwill 132.6 $ 132.4    
Intangible assets 69.1 130.1 69.1  
Net working capital 9.7 (6.9) 9.7  
Contingent consideration $ (10.1) $ (54.3) (10.1)  
Goodwill, Total adjustments     0.2  
Intangible assets, Total Adjustments     (61.0)  
Net working capital, Total adjustments     16.6  
Contingent consideration, Total adjustments     $ 44.2