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RATIONALIZATION CHARGES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]        
Rationalization charges $ 16,031 $ 56,351 $ 6,253  
Restructuring reserve 41,560 43,713 1,612 $ 2,419
Accrued Liabilities        
Restructuring Cost and Reserve [Line Items]        
Restructuring reserve 4,500 5,000    
Other Liabilities        
Restructuring Cost and Reserve [Line Items]        
Restructuring reserve 37,000 38,700    
Metal Container Plant Closings and the Central States Pension Plan withdrawal        
Restructuring Cost and Reserve [Line Items]        
Rationalization charges 4,100 46,200    
Central States Pension Plan withdrawal | Annually Through 2040        
Restructuring Cost and Reserve [Line Items]        
Accretion expense 1,100      
Effect on future cash flows, amount 3,100      
Central States Pension Plan withdrawal | Metal Container Plant Closings and the Central States Pension Plan withdrawal        
Restructuring Cost and Reserve [Line Items]        
Net rationalization charges 62,000      
Plant Exit Costs        
Restructuring Cost and Reserve [Line Items]        
Rationalization charges 2,296 1,336 534  
Restructuring reserve 555 $ 898 $ 1,482 $ 2,397
Plant Exit Costs | Metal Container Plant Closings and the Central States Pension Plan withdrawal        
Restructuring Cost and Reserve [Line Items]        
Net rationalization charges 3,500      
Other Restructuring | Rationalization Plan        
Restructuring Cost and Reserve [Line Items]        
Effect on future cash flows, amount 3,900      
Remaining expenses for our rationalization plans $ 2,500