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ACQUISITIONS - Intangible assets acquired (Details) - USD ($)
$ in Millions
Jul. 01, 2021
Dec. 31, 2020
Aug. 04, 2020
Jul. 01, 2020
Jun. 01, 2020
Feb. 03, 2020
Hanweck            
Acquisitions            
Total identifiable intangible assets           $ 14.0
FT Options            
Acquisitions            
Total identifiable intangible assets           6.3
Trade Alert            
Acquisitions            
Total identifiable intangible assets         $ 2.0  
EuroCCP            
Acquisitions            
Total identifiable intangible assets       $ 32.3    
MATCHNow            
Acquisitions            
Total identifiable intangible assets     $ 36.7      
BIDS Holdings            
Acquisitions            
Total identifiable intangible assets   $ 156.4        
Chi-X Asia Pacific            
Acquisitions            
Total identifiable intangible assets $ 73.8          
Customer relationships | Hanweck            
Acquisitions            
Finite-lived intangible assets acquired           $ 4.9
Useful Life (Years)           13 years
Customer relationships | FT Options            
Acquisitions            
Finite-lived intangible assets acquired           $ 2.2
Useful Life (Years)           13 years
Customer relationships | Trade Alert            
Acquisitions            
Finite-lived intangible assets acquired         $ 0.7  
Useful Life (Years)         13 years  
Customer relationships | MATCHNow            
Acquisitions            
Finite-lived intangible assets acquired     $ 17.4      
Useful Life (Years)     15 years      
Customer relationships | BIDS Holdings            
Acquisitions            
Finite-lived intangible assets acquired   $ 137.0        
Useful Life (Years)   17 years        
Customer relationships | Chi-X Asia Pacific            
Acquisitions            
Finite-lived intangible assets acquired $ 60.1          
Useful Life (Years) 30 years          
Technology | Hanweck            
Acquisitions            
Finite-lived intangible assets acquired           $ 2.1
Useful Life (Years)           4 years
Technology | FT Options            
Acquisitions            
Finite-lived intangible assets acquired           $ 0.9
Useful Life (Years)           4 years
Technology | Trade Alert            
Acquisitions            
Finite-lived intangible assets acquired         $ 0.3  
Useful Life (Years)         4 years  
Technology | EuroCCP            
Acquisitions            
Finite-lived intangible assets acquired       $ 3.6    
Useful Life (Years)       6 years    
Technology | MATCHNow            
Acquisitions            
Finite-lived intangible assets acquired     $ 0.7      
Useful Life (Years)     7 years      
Technology | BIDS Holdings            
Acquisitions            
Finite-lived intangible assets acquired   $ 17.8        
Useful Life (Years)   11 years        
Technology | Chi-X Asia Pacific            
Acquisitions            
Finite-lived intangible assets acquired $ 7.5          
Useful Life (Years) 2 years          
Trademarks and tradenames | Hanweck            
Acquisitions            
Finite-lived intangible assets acquired           $ 7.0
Useful Life (Years)           10 years
Trademarks and tradenames | FT Options            
Acquisitions            
Finite-lived intangible assets acquired           $ 3.2
Useful Life (Years)           10 years
Trademarks and tradenames | Trade Alert            
Acquisitions            
Finite-lived intangible assets acquired         $ 1.0  
Useful Life (Years)         10 years  
Trademarks and tradenames | EuroCCP            
Acquisitions            
Finite-lived intangible assets acquired       $ 0.6    
Useful Life (Years)       10 years    
Trademarks and tradenames | MATCHNow            
Acquisitions            
Finite-lived intangible assets acquired     $ 0.2      
Useful Life (Years)     2 years      
Trademarks and tradenames | BIDS Holdings            
Acquisitions            
Finite-lived intangible assets acquired   $ 1.6        
Useful Life (Years)   10 years        
Trading registrations and licenses | EuroCCP            
Acquisitions            
Indefinite-lived intangible assets acquired       $ 28.1    
Trading registrations and licenses | MATCHNow            
Acquisitions            
Indefinite-lived intangible assets acquired     $ 18.4      
Trading registrations and licenses | Chi-X Asia Pacific            
Acquisitions            
Indefinite-lived intangible assets acquired $ 6.2