Financial Instruments and Risk Management (Fair Value And Presentation in the Balance Sheet Narrative) (Details) - USD ($) $ in Millions |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Collars and Forwards | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Financial liabilities, at fair value | $ 6.6 | |
| Derivatives | Currency Hedging Derivative Instruments | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Financial liabilities, at fair value | $ (9.0) | |
| Derivatives | Fuel Options | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Financial assets, at fair value | 0.1 | $ 0.2 |
| Derivatives | Gold Options | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Financial assets, at fair value | $ (0.8) |