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COMMITMENTS AND CONTINGENCIES - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
motion
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
motion
Sep. 30, 2020
USD ($)
Dec. 31, 2016
USD ($)
Jun. 10, 2021
motion
Apr. 30, 2021
motion
Mar. 31, 2021
motion
Dec. 31, 2020
USD ($)
Sep. 15, 2020
client
copyright
Loss Contingencies [Line Items]                    
Employer contribution $ 0.8 $ 0.7 $ 2.5 $ 2.0            
Current carrying value of guarantor obligations $ 10.9   $ 10.9           $ 13.8  
Oracle Litigation                    
Loss Contingencies [Line Items]                    
Number of violated injunctions asserted | motion               4    
Number of injunctions motioned to be reconsidered | motion 2   2     2 2      
Damages awarded     $ 89.9   $ 124.4          
Oracle Litigation II | Two Specific Company Clients                    
Loss Contingencies [Line Items]                    
Copyrights infringed | copyright                   4
Number of clients | client                   2