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ACCOUNTS PAYABLE AND ACCRUED LIABILITIES - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts Payable and Accrued Liabilities [Abstract]    
Employee termination benefits obligations $ 48.4 $ 37.3
Charges for employee termination benefitsd 83.3 57.1
Share-based compensation expense associated with equity awards held by terminated employees 6.7 $ 17.3
Cumulative charges for employee termination benefits 140.4  
Cumulative charges for employee termination benefits related to share-based compensation expense $ 24.0