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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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    
Allowance for excess and slow moving inventory $ 30.3 $ 27.6  
General and administrative costs allocated to inventory 45.0 39.3 $ 37.2
General and administrative costs included in inventory 18.3 16.0  
Finished goods inventories held on consignment $ 106.5 $ 88.4