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INVESTMENTS - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]            
Available-for-sale securities       $ 0.0 $ 0.0  
Unrealized gain on investments       6.4    
Impairment on other equity method investments         6.7  
Other equity investments            
Schedule of Equity Method Investments [Line Items]            
Unrealized gain on investments       89.1    
Percentage of other equity investment sold 100.00%          
Proceeds from sale of equity method investments $ 2.6 $ 4.2        
Gain on sale of equity investments $ 2.2          
Impairment on other equity method investments     $ 6.7      
Monster LP            
Schedule of Equity Method Investments [Line Items]            
Gain (loss) from changes in the fair value of investment           $ (69.4)
Equity method investments, fair value       0.0 0.0  
Nearbuy            
Schedule of Equity Method Investments [Line Items]            
Gain (loss) from changes in the fair value of investment     $ (1.4)     (3.1)
Equity method investments, fair value       $ 0.0 $ 0.0  
SumUp Holdings            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage       2.40%    
SumUp Holdings | Other equity investments            
Schedule of Equity Method Investments [Line Items]            
Unrealized gain on investments       $ 89.1   51.4
Percentage of other equity investment sold     50.00%      
Proceeds from sale of equity method investments     $ 34.0      
Other Income (Expense)            
Schedule of Equity Method Investments [Line Items]            
Impairments of investments           $ 10.0