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SUPPLEMENTAL BALANCE SHEET INFORMATION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]          
Employee termination benefits obligations $ 17.4   $ 17.4   $ 48.4
Charges for employee termination benefitsd 13.1 $ 24.1 38.3 $ 41.7  
Share-based compensation expense associated with equity awards held by terminated employees 0.7 $ 1.7 1.2 $ 4.2  
Cumulative charges for employee termination benefits 178.7   178.7    
Cumulative charges for employee termination benefits related to share-based compensation expense $ 25.2   $ 25.2