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GOODWILL AND INTANGIBLE ASSETS, NET - Schedule of intangible assets by segment (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Finite-lived Intangible Assets        
Balance at beginning of the year     $ 1,589.9  
Additions     22.3  
Amortization $ (30.1) $ (34.2) (62.6) $ (71.7)
Changes in foreign currency exchange rates     (23.4)  
Balance at end of the year 1,526.2   1,526.2  
Options        
Finite-lived Intangible Assets        
Balance at beginning of the year     166.6  
Additions     22.3  
Amortization     (7.8)  
Balance at end of the year 181.1   181.1  
U.S. Equities        
Finite-lived Intangible Assets        
Balance at beginning of the year     921.4  
Amortization     (30.5)  
Balance at end of the year 890.9   890.9  
European Equities        
Finite-lived Intangible Assets        
Balance at beginning of the year     363.7  
Amortization     (11.5)  
Changes in foreign currency exchange rates     (23.4)  
Balance at end of the year 328.8   328.8  
Global FX        
Finite-lived Intangible Assets        
Balance at beginning of the year     138.2  
Amortization     (12.8)  
Balance at end of the year $ 125.4   $ 125.4