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Derivatives and Hedging (Notional Values of Derivative Instruments) (Details) - Not Designated as Hedging Instrument € in Millions, ¥ in Millions, $ in Millions | Mar. 31, 2026 USD ($) metricTon | Mar. 31, 2026 CNY (¥) metricTon | Mar. 31, 2026 EUR (€) metricTon
--- | --- | --- | ---
April 2026 - June 2026 |  |  |
Derivative [Line Items] |  |  |
Notional values of foreign currency derivatives | $ | $ 2.0 |  |
Volume of copper derivatives (in metric tons per month) | metricTon | 69 | 69 | 69
July 2026 - September 2026 |  |  |
Derivative [Line Items] |  |  |
Notional values of foreign currency derivatives | $ | $ 2.1 |  |
Volume of copper derivatives (in metric tons per month) | metricTon | 69 | 69 | 69
October 2026 - December 2026 |  |  |
Derivative [Line Items] |  |  |
Notional values of foreign currency derivatives | $ | $ 2.3 |  |
Volume of copper derivatives (in metric tons per month) | metricTon | 69 | 69 | 69
January 2027 - March 2027 |  |  |
Derivative [Line Items] |  |  |
Notional values of foreign currency derivatives | $ | $ 2.7 |  |
Volume of copper derivatives (in metric tons per month) | metricTon | 69 | 69 | 69
USD/CNY | Foreign Currency Derivatives |  |  |
Derivative [Line Items] |  |  |
Notional values of foreign currency derivatives | $ 50.8 | ¥ 352.0 |
EUR/USD | Foreign Currency Derivatives |  |  |
Derivative [Line Items] |  |  |
Notional values of foreign currency derivatives | $ 19.0 |  | € 16.5

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