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v3.25.2

Derivatives and Fair Value Measurements - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 AUD ($) $ / $ | Jun. 30, 2025 USD ($) $ / $ | Dec. 31, 2024 USD ($)
Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Transfers Between Fair Value Measurement Hierarchy Levels | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |  |  |
Foreign Exchange Contract [Member] |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Notional amount |  |  |  |  | $ 490,000,000.0 |  |
Foreign Exchange Contract [Member] | Minimum |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative, exchange rate cap (in dollars per share) | $ / $ |  |  |  |  | 0.67 | 0.67 |
Foreign Exchange Contract [Member] | Maximum |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative, exchange rate cap (in dollars per share) | $ / $ |  |  |  |  | 0.70 | 0.70 |
Foreign Exchange Contract [Member] | Designated as Hedging Instrument |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  |  |  |  |  | $ 5.2 |
Derivative Liability, Fair Value Gross |  |  |  |  |  |  | $ 3.6
Coal derivative contracts related to forecasted sales |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Notional amount |  |  |  |  | $ 0 |  |
Foreign Exchange Option |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Notional amount |  |  |  |  | $ 506,000,000 |  |
Foreign Exchange Option | Minimum |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative, Floor Price |  |  |  |  | 0.57 |  |
Derivative, Cap Price |  |  |  |  | 0.66 |  |
Foreign Exchange Option | Maximum |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative, Floor Price |  |  |  |  | 0.61 |  |
Derivative, Cap Price |  |  |  |  | 0.71 |  |
Financial trading contracts |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Notional amount |  |  |  |  | $ 0 |  |

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