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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Loss Contingencies [Line Items]    
Long-term purchase commitment, period 3 years  
Indemnification Agreement    
Loss Contingencies [Line Items]    
Estimate of possible loss $ 29.9 $ 15.5
Chief Executive Officer | Deferred Bonus    
Loss Contingencies [Line Items]    
Transaction bonus payable 2.0  
Capital Addition Purchase Commitments    
Loss Contingencies [Line Items]    
Contractual obligation $ 363.0 $ 406.1