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ACQUISITIONS (Details)
$ in Millions, € in Billions
3 Months Ended
Dec. 31, 2020
USD ($)
Aug. 04, 2020
USD ($)
Jul. 01, 2020
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Jul. 01, 2020
EUR (€)
Acquisitions            
Contingent consideration liabilities $ 32.7     $ 32.1    
Compensation and benefits       72.3 $ 53.3  
Acquisition-related costs       3.4 0.8  
Professional fees       15.6 14.9  
Credit Facility            
Acquisitions            
Debt instrument face amount | €           € 1.5
Acquisitions            
Acquisitions            
Compensation and benefits         0.1  
Acquisition-related costs       3.4 0.8  
Professional fees       2.8 $ 0.7  
Impairment of investment       $ 0.6    
EuroCCP            
Acquisitions            
Intangibles     $ 32.3      
Working capital     $ 56.0      
Ownership interest acquired (as a percent)     80.00%     80.00%
Bargain purchase gain     $ 32.6      
EuroCCP | Credit Facility            
Acquisitions            
Debt instrument face amount | €           € 1.5
Hanweck, FT Options and Trade Alert            
Acquisitions            
Goodwill   $ 100.7        
Intangibles   59.0        
Working capital   2.2        
Contingent consideration liabilities   $ 32.7        
BIDS Holdings            
Acquisitions            
Goodwill 100.5          
Intangibles 156.4          
Working capital $ 22.8