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ACQUISITIONS (Details)
$ in Millions, € in Billions
12 Months Ended
Jul. 01, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Aug. 04, 2020
USD ($)
Jul. 01, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jul. 01, 2020
EUR (€)
Jan. 31, 2016
Acquisitions                  
Goodwill         $ 134.0 $ 201.2      
Contingent consideration liabilities   $ 32.7     70.5 32.7      
Bargain purchase gain           32.6      
Compensation and benefits         288.5 224.9 $ 199.0    
Acquisition-related costs         15.6 45.2 48.5    
Professional fees         83.7 60.6 68.3    
Impairment of goodwill             10.5    
Vest Financial Group Inc.                  
Acquisitions                  
Noncontrolling interest percentage                 40.00%
Acquisitions                  
Acquisitions                  
General and administrative expenses             2.0    
Compensation and benefits             19.3    
Acquisition-related costs         15.6 45.3 48.5    
Professional fees         15.0 22.1 3.9    
Impairment of investment         $ 0.6 15.1      
Impairment of goodwill             10.5    
Impairment facilities charges           8.1 6.1    
Lease termination fees             2.2    
Impairment of capitalized data processing software             $ 4.5    
EuroCCP                  
Acquisitions                  
Intangible assets       $ 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, Trade Alert, and MATCHNow                  
Acquisitions                  
Goodwill     $ 100.7            
Intangible assets     59.0            
Working capital     2.2            
Contingent consideration liabilities     $ 32.7            
BIDS Holdings                  
Acquisitions                  
Goodwill   100.0              
Intangible assets   156.4       156.4      
Working capital   $ 23.3       $ 23.3      
Chi-X Asia Pacific                  
Acquisitions                  
Number of key capital markets | item 2                
Goodwill $ 133.6                
Intangible assets 73.8                
Working capital 25.7                
Contingent consideration liabilities $ 49.6