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Derivatives and Hedging (Notional Values of Derivative Instruments) (Details) - Not Designated as Hedging Instrument € in Millions, ₩ in Millions, ¥ in Millions, ¥ in Millions, Ft in Millions, $ in Millions | Jun. 30, 2025 USD ($) metricTon | Jun. 30, 2025 CNY (¥) metricTon | Jun. 30, 2025 EUR (€) metricTon | Jun. 30, 2025 KRW (₩) metricTon | Jun. 30, 2025 HUF (Ft) metricTon | Jun. 30, 2025 JPY (¥) metricTon
--- | --- | --- | --- | --- | --- | ---
July 2025 - September 2025 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Volume of copper derivatives (in metric tons per month) | 69 | 69 | 69 | 69 | 69 | 69
October 2025 - December 2025 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Volume of copper derivatives (in metric tons per month) | 69 | 69 | 69 | 69 | 69 | 69
January 2026 - March 2026 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Volume of copper derivatives (in metric tons per month) | 69 | 69 | 69 | 69 | 69 | 69
April 2026 - June 2026 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Volume of copper derivatives (in metric tons per month) | 69 | 69 | 69 | 69 | 69 | 69
USD/CNH | Foreign Currency Derivatives |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional values of foreign currency derivatives | $ 48.9 | ¥ 350.0 |  |  |  |
EUR/USD | Foreign Currency Derivatives |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional values of foreign currency derivatives | 12.5 |  | € 10.6 |  |  |
KRW/USD | Foreign Currency Derivatives |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional values of foreign currency derivatives | $ 1.5 |  |  | ₩ 1,964.3 |  |
HUF/EUR | Foreign Currency Derivatives |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional values of foreign currency derivatives |  |  | 1.2 |  | Ft 500.0 |
JPY/EUR | Foreign Currency Derivatives |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional values of foreign currency derivatives |  |  | € 3.1 |  |  | ¥ 525.0

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