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Hedging Transactions and Derivative Financial Instruments (Notional Values of Derivative Instruments) (Details) | Jun. 30, 2020 USD ($) tons_per_month | Jun. 30, 2020 KRW (₩) tons_per_month | Jun. 30, 2020 EUR (€) tons_per_month
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Contracts not designated as hedging instruments | USD/CNH | Foreign Exchange Forward |  |  |
Derivative [Line Items] |  |  |
Notional Values of Foreign Currency Derivatives | $ | $ 25,492,958 |  |
Contracts not designated as hedging instruments | EUR/USD | Foreign Exchange Forward |  |  |
Derivative [Line Items] |  |  |
Notional Values of Foreign Currency Derivatives | € |  |  | € 8,018,710
Contracts not designated as hedging instruments | KRW/USD | Foreign Exchange Forward |  |  |
Derivative [Line Items] |  |  |
Notional Values of Foreign Currency Derivatives | ₩ |  | ₩ 11,961,700,000 |
Contract designated as hedging instrument | July 2020 - September 2020 |  |  |
Derivative [Line Items] |  |  |
Volume of Copper Derivatives (in metric tons per month) | 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
Contract designated as hedging instrument | January 2021 - March 2021 |  |  |
Derivative [Line Items] |  |  |
Volume of Copper Derivatives (in metric tons per month) | 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
Contract designated as hedging instrument | July 2021 - September 2021 |  |  |
Derivative [Line Items] |  |  |
Volume of Copper Derivatives (in metric tons per month) | 171 | 171 | 171

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