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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 | Mar. 31, 2025 USD ($) metricTon | Mar. 31, 2025 CNY (¥) metricTon | Mar. 31, 2025 EUR (€) metricTon | Mar. 31, 2025 KRW (₩) metricTon | Mar. 31, 2025 HUF (Ft) metricTon | Mar. 31, 2025 JPY (¥) metricTon
--- | --- | --- | --- | --- | --- | ---
April 2025 - June 2025 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Volume of Copper Derivatives (in metric tons per month) | 69 | 69 | 69 | 69 | 69 | 69
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
USD/CNH | Foreign Currency Derivatives |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Values of Foreign Currency Derivatives | $ 37.2 | ¥ 270.0 |  |  |  |
EUR/USD | Foreign Currency Derivatives |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Values of Foreign Currency Derivatives | 6.5 |  | € 7.0 |  |  |
KRW/USD | Foreign Currency Derivatives |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Values of Foreign Currency Derivatives | $ 0.5 |  |  | ₩ 732.1 |  |
JPY/EUR | Foreign Currency Derivatives |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Values of Foreign Currency Derivatives |  |  | 4.9 |  |  | ¥ 800.0
HUF/EUR | Foreign Currency Derivatives |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Values of Foreign Currency Derivatives |  |  | € 1.2 |  | Ft 500.0 |

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