Derivatives and Hedging (Notional Values of Derivative Instruments) (Details) - Not Designated as Hedging Instrument € in Millions, ¥ in Millions, $ in Millions	Jun. 30, 2026 USD ($) metricTon	Jun. 30, 2026 CNY (¥) metricTon	Jun. 30, 2026 EUR (€) metricTon
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
April 2027 - June 2027
Derivative [Line Items]
Notional values of foreign currency derivatives \| $	$ 2.8
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	$ 57.4	¥ 391.0
EUR/USD \| Foreign Currency Derivatives
Derivative [Line Items]
Notional values of foreign currency derivatives	$ 20.4		€ 17.8