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SUPPLEMENTAL BALANCE SHEET INFORMATION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]      
Employee termination benefits obligations $ 43.5   $ 48.4
Charges for employee termination benefitsd 25.2 $ 17.6  
Share-based compensation expense associated with equity awards held by terminated employees 0.5 $ 2.6  
Cumulative charges for employee termination benefits 165.6    
Cumulative charges for employee termination benefits related to share-based compensation expense $ 24.5