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ACQUISITIONS (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 03, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Acquisitions            
Compensation and benefits   $ 54.9 $ 52.2 $ 108.2 $ 100.3  
Acquisition-related costs   9.4 20.8 10.2 23.1  
Professional fees   12.3 19.2 27.2 35.4  
Goodwill       66.4    
Contingent consideration liabilities   20.5   20.5   $ 2.2
Impairment of goodwill         10.5  
Acquisitions            
Acquisitions            
Compensation and benefits     2.1   3.4  
Acquisition-related costs   9.4 20.8 10.2 23.1  
Professional fees   1.3 0.8 2.1 1.8  
Impairment of goodwill     10.5   10.5  
Impairment facilities charges   $ 8.1 6.1 $ 8.1 6.1  
Lease termination fees     $ 1.1   $ 1.1  
Hanweck, FT Options and Trade Alert            
Acquisitions            
Goodwill $ 66.4          
Intangibles 22.3          
Working capital 0.5          
Contingent consideration liabilities $ 20.5