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DERIVATIVE FINANCIAL INSTRUMENTS (Additional Information) (Details)
MMBTU in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
MMBTU
Dec. 31, 2018
USD ($)
MMBTU
Feb. 28, 2018
USD ($)
Derivatives, Fair Value [Line Items]      
Period hedging portion of natural gas usage considered in advance of purchase 36 months    
Forward Contracts      
Derivatives, Fair Value [Line Items]      
Notional amount   $ 11.9  
Derivatives designated as hedging instruments | Commodity contracts      
Derivatives, Fair Value [Line Items]      
Percent of forecasted usage to be hedged 90.00%    
Notional amount (in MMBtus) | MMBTU 2.8 1.0  
Net gain (loss) to be reclassified from accumulated other comprehensive income to earnings during the next 12 months $ (0.5)    
Derivatives designated as hedging instruments | Swap contracts      
Derivatives, Fair Value [Line Items]      
Notional amount 15.7    
Gain (loss) expected to be reclassified during the next twelve months $ 2.8    
Derivatives not designated as hedging instruments | Foreign Exchange Contract      
Derivatives, Fair Value [Line Items]      
Net gain (loss) to be reclassified from accumulated other comprehensive income to earnings during the next 12 months   $ 1.5  
Notional amount     $ 19.9
Derivatives not designated as hedging instruments | Forward Contracts      
Derivatives, Fair Value [Line Items]      
Net gain (loss) to be reclassified from accumulated other comprehensive income to earnings during the next 12 months   $ (1.0)