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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Period prior to expiration date which triggers write-down of inventory 6 months    
Period used to evaluate slow-moving inventory levels 2 years    
General and administrative costs allocated to inventory $ 63.1 $ 56.6 $ 45.0
General and administrative costs included in inventory 30.7 22.8  
Finished goods inventories held on consignment $ 130.0 $ 117.8