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Hedging Transactions and Derivative Financial Instruments (Notional Values of Derivative Instruments) (Details)
Mar. 31, 2020
USD ($)
tons_per_month
Mar. 31, 2020
JPY (¥)
tons_per_month
Mar. 31, 2020
EUR (€)
tons_per_month
Mar. 31, 2020
KRW (₩)
tons_per_month
Contracts not designated as hedging instruments | USD/CNH | Foreign Exchange Forward        
Derivative [Line Items]        
Notional Values of Foreign Currency Derivatives | $ $ 20,439,416      
Contracts not designated as hedging instruments | EUR/USD | Foreign Exchange Forward        
Derivative [Line Items]        
Notional Values of Foreign Currency Derivatives | €     € 13,510,979  
Contracts not designated as hedging instruments | KRW/USD | Foreign Exchange Forward        
Derivative [Line Items]        
Notional Values of Foreign Currency Derivatives | ₩       ₩ 9,669,600,000
Contracts not designated as hedging instruments | JPY/EUR | Foreign Exchange Forward        
Derivative [Line Items]        
Notional Values of Foreign Currency Derivatives | ¥   ¥ 360,000,000    
Contract designated as hedging instrument | April 2020 - June 2020        
Derivative [Line Items]        
Volume of Copper Derivatives (in metric tons per month) 202 202 202 202
Contract designated as hedging instrument | July 2020 - September 2020        
Derivative [Line Items]        
Volume of Copper Derivatives (in metric tons per month) 201 201 201 201
Contract designated as hedging instrument | October 2020 - December 2020        
Derivative [Line Items]        
Volume of Copper Derivatives (in metric tons per month) 201 201 201 201
Contract designated as hedging instrument | January 2021 - March 2021        
Derivative [Line Items]        
Volume of Copper Derivatives (in metric tons per month) 256 256 256 256
Contract designated as hedging instrument | April 2021 - June 2021        
Derivative [Line Items]        
Volume of Copper Derivatives (in metric tons per month) 256 256 256 256